Statistics and Probability

Consider the continuous random variable x, which has a uniform distribution over the interval from ...

Consider the continuous random variable x, which has a uniform distribution over the interval from ...

Consider the continuous random variable x, which has a uniform distribution over the interval from 20 to 28 . The probability that x will take on a value between 21 and 25 is_____.
 a. .125
  b. .25
  c. .5
  d. 1

KAtlold   32   1 Reply

ccopp

Consider the continuous random variable x, which has a uniform distribution over the interval from ...

Consider the continuous random variable x, which has a uniform distribution over the interval from ...

Consider the continuous random variable x, which has a uniform distribution over the interval from 20 to 28 . The mean of x is _____.
 a. 0
  b. .125
  c. 23
  d. 24

lingo   28   1 Reply

Macdonaldc

The travel time for a college student traveling between her home and her college is uniformly ...

The travel time for a college student traveling between her home and her college is uniformly ...

The travel time for a college student traveling between her home and her college is uniformly distributed between 40 and 90 minutes. What is the random variable in this experiment?
 a. Uniform distribution
  b. 40 minutes
  c. 90 minu

Brutusandmoose   53   1 Reply

tiss9889

The travel time for a college student traveling between her home and her college is uniformly ...

The travel time for a college student traveling between her home and her college is uniformly ...

The travel time for a college student traveling between her home and her college is uniformly distributed between 40 and 90 minutes. The probability that her trip will take exactly 50 minutes is _____.
 a. 0
  b. .02
  c. .06
  d

strobro   46   1 Reply

tdubb1992

The weight of football players is normally distributed with a mean of 200 pounds and a standard ...

The weight of football players is normally distributed with a mean of 200 pounds and a standard ...

The weight of football players is normally distributed with a mean of 200 pounds and a standard deviation of 25 pounds. The probability of a player weighing less than 250 pounds is _____.
 a. .4772
  b. .9772
  c. .0528
  d. .500

everlyn85   19   1 Reply

Macdonaldc

The starting salaries of individuals with an MBA degree are normally distributed with a mean of ...

The starting salaries of individuals with an MBA degree are normally distributed with a mean of ...

The starting salaries of individuals with an MBA degree are normally distributed with a mean of 40,000 and a standard deviation of 5,000 . What is the random variable in this experiment?
 a. Starting salaries
  b. Normal distribution

ejohnson3310   22   1 Reply

kmoralesss

The starting salaries of individuals with an MBA degree are normally distributed with a mean of ...

The starting salaries of individuals with an MBA degree are normally distributed with a mean of ...

The starting salaries of individuals with an MBA degree are normally distributed with a mean of 40,000 and a standard deviation of 5,000 . What percentage of MBAs will have starting salaries of 34,000 to 46,000?
 a. 38.49
  b. 38.59
 

littlej_dvine   36   1 Reply

gomeza

The weight of items produced by a machine is normally distributed with a mean of 8 ounces and a ...

The weight of items produced by a machine is normally distributed with a mean of 8 ounces and a ...

The weight of items produced by a machine is normally distributed with a mean of 8 ounces and a standard deviation of 2 ounces. What percentage of items will weigh at least 11.7 ounces?
 a. 46.78
  b. 96.78
  c. 3.22
  d. 53.22

Jbev757   25   1 Reply

gomeza

The weight of items produced by a machine is normally distributed with a mean of 8 ounces and a ...

The weight of items produced by a machine is normally distributed with a mean of 8 ounces and a ...

The weight of items produced by a machine is normally distributed with a mean of 8 ounces and a standard deviation of 2 ounces. What is the probability that a randomly selected item weighs exactly 8 ounces?
 a. .5
  b. 1.0
  c. .3413

strobro   33   1 Reply

JMENDEZ

The life expectancy of a particular brand of tire is normally distributed with a mean of 40,000 and ...

The life expectancy of a particular brand of tire is normally distributed with a mean of 40,000 and ...

The life expectancy of a particular brand of tire is normally distributed with a mean of 40,000 and a standard deviation of 5,000 miles. What is the probability that a randomly selected tire will have a life of at least 30,000 miles?
 a. .4772

RENCEE72   27   1 Reply

tgreen77

The life expectancy of a particular brand of tire is normally distributed with a mean of 40,000 and ...

The life expectancy of a particular brand of tire is normally distributed with a mean of 40,000 and ...

The life expectancy of a particular brand of tire is normally distributed with a mean of 40,000 and a standard deviation of 5,000 miles. What is the probability that a randomly selected tire will have a life of at least 47,500 miles?
 a. .4332

Jbev757   23   2 Replies

Jbev757

The life expectancy of a particular brand of tire is normally distributed with a mean of 40,000 and ...

The life expectancy of a particular brand of tire is normally distributed with a mean of 40,000 and ...

The life expectancy of a particular brand of tire is normally distributed with a mean of 40,000 and a standard deviation of 5,000 miles. What is the probability that a randomly selected tire will have a life of exactly 47,500 miles?
 a. .4332

ejohnson3310   32   1 Reply

syaar

Excel's NORM.S.DIST function can be used to compute _____.

Excel's NORM.S.DIST function can be used to compute _____.

Excel's NORM.S.DIST function can be used to compute _____.
 a. cumulative probabilities for a standard normal z value
  b. the standard normal z value given a cumulative probability
  c. cumulative probabilities for a normally distrib

SnowQueen   52   1 Reply

al

Excel's NORM.S.INV function can be used to compute _____.

Excel's NORM.S.INV function can be used to compute _____.

Excel's NORM.S.INV function can be used to compute _____.
 a. cumulative probabilities for a standard normal z value
  b. the standard normal z value given a cumulative probability
  c. cumulative probabilities for a normally distribu

Skoochy   61   1 Reply

m7md9078

Excel's NORM.DIST function can be used to compute _____.

Excel's NORM.DIST function can be used to compute _____.

Excel's NORM.DIST function can be used to compute _____.
 a. cumulative probabilities for a standard normal z value
  b. the standard normal z value given a cumulative probability
  c. cumulative probabilities for a normally distribut

browniels   82   1 Reply

wping

When using Excel's EXPON.DIST function, one should choose TRUE for the third input if _____ is ...

When using Excel's EXPON.DIST function, one should choose TRUE for the third input if _____ is ...

When using Excel's EXPON.DIST function, one should choose TRUE for the third input if _____ is desired.
 a. a probability
  b. a cumulative probability
  c. the expected value
  d. the correct answer

aggotfay   111   1 Reply

rachey

The skewness measure for exponential distributions is _____.

The skewness measure for exponential distributions is _____.

The skewness measure for exponential distributions is _____.
 a. 0
  b. 1
  c. 2
  d. 3

Nalu   110   1 Reply

vbass

Exponential distributions _____. (Multiple Choice)

Exponential distributions _____. (Multiple Choice)

Exponential distributions _____.
 a. are skewed to the left
  b. are skewed to the right
  c. can be skewed to the left or right
  d. are not skewed

littlej_dvine   58   1 Reply

hahauebf

About 95.4 of the values of a normal random variable are within approximately how many standard ...

About 95.4 of the values of a normal random variable are within approximately how many standard ...

About 95.4 of the values of a normal random variable are within approximately how many standard deviations of its mean?
 a. 1.7
  b. 2
  c. 2.5
  d. 3

stroman54   32   2 Replies

stroman54

All of the following distributions are symmetric EXCEPT the _____ distribution.

All of the following distributions are symmetric EXCEPT the _____ distribution.

All of the following distributions are symmetric EXCEPT the _____ distribution.
 a. uniform
  b. normal
  c. exponential
  d. standard normal

escoba   27   1 Reply

tgreen77

The length of time patients must wait to see a doctor in a local clinic is uniformly distributed ...

The length of time patients must wait to see a doctor in a local clinic is uniformly distributed ...

The length of time patients must wait to see a doctor in a local clinic is uniformly distributed between 15 minutes and 2 1/2 hours.
 a. Define the random variable in words.
  b. What is the probability of a patient waiting exactly 50 minu

lingo   134   1 Reply

lirpapril

Suppose z is a standard normal variable. Find the value of z in the following.

Suppose z is a standard normal variable. Find the value of z in the following.

Suppose z is a standard normal variable. Find the value of z in the following.
 a. The area between 0 and z is .4678.
  b. The area to the right of z is .1112.
  c. The area to the left of z is .8554
  d. The area between z and z

alexisblack   18   1 Reply

al

The miles per gallon obtained by the 1995 model Q cars is normally distributed with a mean of 22 ...

The miles per gallon obtained by the 1995 model Q cars is normally distributed with a mean of 22 ...

The miles per gallon obtained by the 1995 model Q cars is normally distributed with a mean of 22 miles per gallon and a standard deviation of 5 miles per gallon.
 a. What is the probability that a car will get between 13.35 and 35.1 miles per g

jprust87   96   1 Reply

DCAV1

The average starting salary for this year's graduates at a large university (LU) is 30,000 with a ...

The average starting salary for this year's graduates at a large university (LU) is 30,000 with a ...

The average starting salary for this year's graduates at a large university (LU) is 30,000 with a standard deviation of 8,000 . Furthermore, it is known that the starting salaries are normally distributed.
 a. What is the probability that a ran

aggotfay   81   1 Reply

clew0012

The weights of items produced by a company are normally distributed with a mean of 4.5 ounces and a ...

The weights of items produced by a company are normally distributed with a mean of 4.5 ounces and a ...

The weights of items produced by a company are normally distributed with a mean of 4.5 ounces and a standard deviation of 0.3 ounce.
 a. What is the probability that a randomly selected item from the production will weigh at least 4.14 ounces?

clcharleston   26   1 Reply

Macdonaldc

The life expectancy of Timely brand watches is normally distributed with a mean of four years and a ...

The life expectancy of Timely brand watches is normally distributed with a mean of four years and a ...

The life expectancy of Timely brand watches is normally distributed with a mean of four years and a standard deviation of eight months.
 a. What is the probability that a randomly selected watch will be in working condition for more than five y

bribery   13   1 Reply

Yatesm

Cans of tomato paste produced by a company are normally distributed with a mean of 6 ounces and a ...

Cans of tomato paste produced by a company are normally distributed with a mean of 6 ounces and a ...

Cans of tomato paste produced by a company are normally distributed with a mean of 6 ounces and a standard deviation of 0.3 ounces.
 a. What percentage of all cans produced contains more than 6.51 ounces of tomato paste?
  b. What percenta

cmsx27   33   1 Reply

umass508

The daily dinner bills in a local restaurant are normally distributed with a mean of 28 and a ...

The daily dinner bills in a local restaurant are normally distributed with a mean of 28 and a ...

The daily dinner bills in a local restaurant are normally distributed with a mean of 28 and a standard deviation of 6.
 a. Define the random variable in words.
  b. What is the probability that a randomly selected bill will be at least 39.

Storm   43   1 Reply

lirpapril

The average starting salary of this year's MBA students is 35,000 with a standard deviation of ...

The average starting salary of this year's MBA students is 35,000 with a standard deviation of ...

The average starting salary of this year's MBA students is 35,000 with a standard deviation of 5,000 . Furthermore, it is known that the starting salaries are normally distributed. What are the minimum and maximum starting salaries of the middle 95 o

palacir999   67   1 Reply

ruff

The monthly earnings of computer programmers are normally distributed with a mean of 4,000 . If only ...

The monthly earnings of computer programmers are normally distributed with a mean of 4,000 . If only ...

The monthly earnings of computer programmers are normally distributed with a mean of 4,000 . If only 1.7 of programmers have monthly incomes of less than 2,834, what is the standard deviation of the monthly earnings of the computer programmers?

aggotfay   41   1 Reply

alarose

In grading eggs into small, medium, and large, Linda Farms packs the eggs that weigh more than 3.6 ...

In grading eggs into small, medium, and large, Linda Farms packs the eggs that weigh more than 3.6 ...

In grading eggs into small, medium, and large, Linda Farms packs the eggs that weigh more than 3.6 ounces in packages marked large and the eggs that weigh less than 2.4 ounces into packages marked small; the remainder are packed in packages marked me

beaches411   100   2 Replies

beaches411

A manufacturing process produces items whose weights are normally distributed. It is known that ...

A manufacturing process produces items whose weights are normally distributed. It is known that ...

A manufacturing process produces items whose weights are normally distributed. It is known that 22.57 of all the items produced weigh between 100 grams up to the mean and 49.18 weigh from the mean up to 190 grams. Determine the mean and standard devi

thisisstupidash   48   1 Reply

nic

Suppose x is a normally distributed random variable with a mean of 50 and a standard deviation of 5 ...

Suppose x is a normally distributed random variable with a mean of 50 and a standard deviation of 5 ...

Suppose x is a normally distributed random variable with a mean of 50 and a standard deviation of 5 . Use Excel to calculate the following:
 a. P(x  45)
  b. P(45  x  55)
  c. P(x  55)
  d. x value with 0.20 in the lower tail

Storm   54   1 Reply

m7md9078

The time between arrivals of customers at the drive-up window of a bank follows an exponential ...

The time between arrivals of customers at the drive-up window of a bank follows an exponential ...

The time between arrivals of customers at the drive-up window of a bank follows an exponential probability distribution with a mean of 10 minutes.
 a. What is the probability that the arrival time between customers will be 7 minutes or less?

strobro   67   1 Reply

Yatesm

The expected value of x equals the mean of the population from which the sample is drawn _____.

The expected value of x equals the mean of the population from which the sample is drawn _____.

The expected value of x equals the mean of the population from which the sample is drawn _____.
 a. only if the sample size is 30 or greater
  b. only if the sample size is 50 or greater
  c. only if the sample size is 100 or greater

Brutusandmoose   37   1 Reply

DCAV1

The basis for using a normal probability distribution to approximate the sampling distribution of x ...

The basis for using a normal probability distribution to approximate the sampling distribution of x ...

The basis for using a normal probability distribution to approximate the sampling distribution of x and p is _____.
 a. Chebyshev's theorem
  b. the empirical rule
  c. the central limit theorem
  d. Bayes' theorem

Brutusandmoose   43   1 Reply

gool34

The value of the ___________ is used to estimate the value of the population parameter.

The value of the ___________ is used to estimate the value of the population parameter.

The value of the ___________ is used to estimate the value of the population parameter.
 a. population statistic
  b. sample parameter
  c. population estimate
  d. sample statistic

cmsx27   24   1 Reply

whitneyracquel

The standard deviation of a point estimator is the _____.

The standard deviation of a point estimator is the _____.

The standard deviation of a point estimator is the _____.
 a. standard error
  b. sample statistic
  c. point estimate
  d. sampling error

cmsx27   99   1 Reply

nic

A subset of a population selected to represent the population is a _____.

A subset of a population selected to represent the population is a _____.

A subset of a population selected to represent the population is a _____.
 a. subset
  b. sample
  c. small population
  d. None of the answers is correct.

browniels   69   1 Reply

al

The purpose of statistical inference is to provide information about the _____.

The purpose of statistical inference is to provide information about the _____.

The purpose of statistical inference is to provide information about the _____.
 a. sample based upon information contained in the population
  b. population based upon information contained in the sample
  c. population based upon in

fundai!   44   2 Replies

fundai!