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Home Q & A Board Science-Related Homework Help Mathematics Statistics and Probability
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In a(n) ____________________ study, there is no attempt to control factors that might influence the ...
In a(n) ____________________ study, there is no attempt to control factors that might influence the ...
In a(n) ____________________ study, there is no attempt to control factors that might influence the variable of interest.
 Fill in the blank(s) with correct word
tmontes00   42   1 Reply
6 years ago
A Poisson random variable is the number of successes that occur in a period of ____________________ ...
A Poisson random variable is the number of successes that occur in a period of ____________________ ...
A Poisson random variable is the number of successes that occur in a period of ____________________ or an interval of ____________________ in a Poisson experiment.
 Fill in the blank(s) with correct word
tmontes00   55   1 Reply
6 years ago
Let X represent weekly income expressed in dollars. Since there is no set upper limit, we cannot ...
Let X represent weekly income expressed in dollars. Since there is no set upper limit, we cannot ...
Let X represent weekly income expressed in dollars. Since there is no set upper limit, we cannot identify (and thus cannot count) all the possible values. Consequently, weekly income is regarded as a continuous random variable.
  Indicate wheth
tmontes00   27   1 Reply
6 years ago
Two events A and B are independent if P(A and B) = 0. Indicate whether the statement is true or false
Two events A and B are independent if P(A and B) = 0. Indicate whether the statement is true or false
Two events A and B are independent if P(A and B) = 0.
  Indicate whether the statement is true or false
tmontes00   47   1 Reply
6 years ago
An exponential random variable is an example of a(n) ____________________ random variable. Fill in ...
An exponential random variable is an example of a(n) ____________________ random variable. Fill in ...
An exponential random variable is an example of a(n) ____________________ random variable.
 Fill in the blank(s) with correct word
tmontes00   29   1 Reply
6 years ago
The F distribution has two parameters called degrees of freedom, 1 and 2 . We call 1 the ...
The F distribution has two parameters called degrees of freedom, 1 and 2 . We call 1 the ...
The F distribution has two parameters called degrees of freedom, 1 and 2 . We call 1 the ____________________ degrees of freedom, and we call 2 the ____________________ degrees of freedom.
 Fill in the blank(s) with correct word
tmontes00   32   1 Reply
6 years ago
Another name for the mean of a probability distribution is its expected value. Indicate whether ...
Another name for the mean of a probability distribution is its expected value. Indicate whether ...
Another name for the mean of a probability distribution is its expected value.
  Indicate whether the statement is true or false
tmontes00   37   1 Reply
6 years ago
A local magazine store sells an average of 2,100 magazines per day, with a standard deviation of 500 ...
A local magazine store sells an average of 2,100 magazines per day, with a standard deviation of 500 ...
A local magazine store sells an average of 2,100 magazines per day, with a standard deviation of 500 magazines. Consider a sample of 60 days of operation. What is the shape of the sampling distribution of the sample mean number of magazines sold per
tmontes00   64   1 Reply
6 years ago
In general, the binomial probability P(X
In general, the binomial probability P(X
In general, the binomial probability P(X
tmontes00   27   1 Reply
6 years ago
The portfolio expected return of two investments:
The portfolio expected return of two investments:
The portfolio expected return of two investments:
 a. will be higher when the covariance is zero.
  b. will be higher when the covariance is negative.
  c. will be higher when the covariance is positive.
  d. does not depend on t
tmontes00   36   1 Reply
6 years ago
Categorical data can be graphically represented by using a(n) _____.
Categorical data can be graphically represented by using a(n) _____.
Categorical data can be graphically represented by using a(n) _____.
 a. histogram
  b. frequency polygon
  c. ogive
  d. bar chart
tmontes00   63   1 Reply
6 years ago
To construct a bar chart using Excel's Chart Tools, choose __________ as the chart type.
To construct a bar chart using Excel's Chart Tools, choose __________ as the chart type.
To construct a bar chart using Excel's Chart Tools, choose __________ as the chart type.
 a. column
  b. pie
  c. scatter
  d. line
tmontes00   82   1 Reply
6 years ago
Suppose that the amount of time teenagers spend playing computer games per week is normally ...
Suppose that the amount of time teenagers spend playing computer games per week is normally ...
Suppose that the amount of time teenagers spend playing computer games per week is normally distributed with a standard deviation of 1.5 hours. A sample of 100 teenagers is selected at random, and the sample mean computed as 6.5 hours. Determine and
tmontes00   61   1 Reply
6 years ago
The error of estimation is the ____________________ between an estimator and the parameter. Fill in ...
The error of estimation is the ____________________ between an estimator and the parameter. Fill in ...
The error of estimation is the ____________________ between an estimator and the parameter.
 Fill in the blank(s) with correct word
tmontes00   44   1 Reply
6 years ago
The statement of the null hypothesis always includes an equals sign (=). Indicate whether the ...
The statement of the null hypothesis always includes an equals sign (=). Indicate whether the ...
The statement of the null hypothesis always includes an equals sign (=).
  Indicate whether the statement is true or false
tmontes00   42   1 Reply
6 years ago
If a researcher rejects a true null hypothesis, she has made a(n) ____________________ error. Fill ...
If a researcher rejects a true null hypothesis, she has made a(n) ____________________ error. Fill ...
If a researcher rejects a true null hypothesis, she has made a(n) ____________________ error.
 Fill in the blank(s) with correct word
tmontes00   68   1 Reply
6 years ago
The symbol 2 is used to represent the _____.
The symbol 2 is used to represent the _____.
The symbol  2 is used to represent the _____.
 a. variance of a population
  b. standard deviation of a sample
  c. standard deviation of a population
  d. variance of a sample
tmontes00   49   1 Reply
6 years ago
On a December day, the probability of snow is .30 . The probability of a cold day is .50 . The ...
On a December day, the probability of snow is .30 . The probability of a cold day is .50 . The ...
On a December day, the probability of snow is .30 . The probability of a cold day is .50 . The probability of snow and a cold day is .15 . Are snow and cold weather independent events?
 a. only if given that it snowed
  b. no
  c. yes
tmontes00   25   1 Reply
6 years ago
A random variable that can assume only a finite number of values is referred to as a(n) _____.
A random variable that can assume only a finite number of values is referred to as a(n) _____.
A random variable that can assume only a finite number of values is referred to as a(n) _____.
 a. infinite sequence
  b. finite sequence
  c. discrete random variable
  d. discrete probability function
tmontes00   47   1 Reply
6 years ago
Which of the following is NOT a characteristic of the normal probability distribution?
Which of the following is NOT a characteristic of the normal probability distribution?
Which of the following is NOT a characteristic of the normal probability distribution?
 a. The graph of the curve is the shape of a rectangle.
  b. The total area under the curve is always equal to 1.
  c. The random variable assumes
tmontes00   33   1 Reply
6 years ago
The Globe Fishery packs shrimp that weigh more than 1.91 ounces each in packages marked large and ...
The Globe Fishery packs shrimp that weigh more than 1.91 ounces each in packages marked large and ...
The Globe Fishery packs shrimp that weigh more than 1.91 ounces each in packages marked large and shrimp that weigh less than 0.47 ounce each into packages marked small; the remainder are packed in medium size packages. If a day's catch showed that 1
tmontes00   788   3 Replies
2 years ago
A random sample of 121 bottles of cologne showed an average content of 4 ounces. It is known that ...
A random sample of 121 bottles of cologne showed an average content of 4 ounces. It is known that ...
A random sample of 121 bottles of cologne showed an average content of 4 ounces. It is known that the standard deviation of the contents (i.e., of the population) is 0.22 ounces. In this problem, the .22 is _____.
 a. a parameter
  b. a st
tmontes00   43   1 Reply
6 years ago
When the population has a normal distribution, the sampling distribution of xis normally distributed ...
When the population has a normal distribution, the sampling distribution of xis normally distributed ...
When the population has a normal distribution, the sampling distribution of xis normally distributed _____.
 a. for any sample size
  b. for any sample size of 30 or more
  c. for any sample size of 50 or more
  d. for any sample
tmontes00   64   1 Reply
6 years ago
Candidate A is running for president of the student government at a large university. The proportion ...
Candidate A is running for president of the student government at a large university. The proportion ...
Candidate A is running for president of the student government at a large university. The proportion of voters who favor the candidate is .8 . A simple random sample of 100 voters is taken.
 a. What are the expected value, standard deviation, a
tmontes00   58   1 Reply
6 years ago
A random sample of 81 automobiles traveling on a section of an interstate showed an average speed of ...
A random sample of 81 automobiles traveling on a section of an interstate showed an average speed of ...
A random sample of 81 automobiles traveling on a section of an interstate showed an average speed of 60 mph. The distribution of speeds of all cars on this section of highway is normally distributed, with a standard deviation of 13.5 mph. The value t
tmontes00   69   1 Reply
6 years ago
Read the t statistic from the table of t distributions and circle the correct answer. A one-tailed ...
Read the t statistic from the table of t distributions and circle the correct answer. A one-tailed ...
Read the t statistic from the table of t distributions and circle the correct answer. A one-tailed test (upper tail), a sample size of 18 at a .05 level of significance; t = _____.
 a. 2.12
  b. 1.734
  c. 1.740
  d. 1.740
tmontes00   44   1 Reply
6 years ago
For each shipment of parts a manufacturer wants to accept only those shipments with at most 10 ...
For each shipment of parts a manufacturer wants to accept only those shipments with at most 10 ...
For each shipment of parts a manufacturer wants to accept only those shipments with at most 10 defective parts. A large shipment has just arrived. A quality control manager randomly selects 50 of the parts from the shipment and finds that 6 parts are
tmontes00   37   1 Reply
6 years ago
The symbol used for the variance of the sample is _____.
The symbol used for the variance of the sample is _____.
The symbol used for the variance of the sample is _____.
 a.
  b. 2
  c. s
  d. s2
tmontes00   24   1 Reply
6 years ago
The bottler of a certain soft drink claims its equipment to be accurate and that the variance of all ...
The bottler of a certain soft drink claims its equipment to be accurate and that the variance of all ...
The bottler of a certain soft drink claims its equipment to be accurate and that the variance of all filled bottles is .05 or less. The null hypothesis in a test to confirm the claim would be written as _____.
 a. H0: 2  .05
  b. H0: 2 > .
tmontes00   29   1 Reply
6 years ago
Which of the following has a 2 distribution?
Which of the following has a 2 distribution?
Which of the following has a 2 distribution?
 a. (n  1)2/s2
  b. (n  2)2/s2
  c. (n  1)s/
  d. (n  1)s2/2
tmontes00   15   2 Replies
6 years ago
N = 14 H0: 2 410 s = 20 Ha: 2 > 410 The null hypothesis _____.
N = 14 H0: 2 410 s = 20 Ha: 2 > 410 The null hypothesis _____.
n = 14 H0: 2  410 s = 20 Ha: 2 > 410 The null hypothesis _____.
 a. should be rejected
  b. should not be rejected
  c. should be revised
  d. None of the answers is correct.
tmontes00   25   1 Reply
6 years ago
If the coefficient of determination is equal to 1, then the coefficient of correlation _____.
If the coefficient of determination is equal to 1, then the coefficient of correlation _____.
If the coefficient of determination is equal to 1, then the coefficient of correlation _____.
 a. must also be equal to 1
  b. can be either 1 or 1
  c. can be any value between 1 and 1
  d. must be 1
tmontes00   73   1 Reply
6 years ago
The largest experimental statistical study ever conducted is believed to be for
The largest experimental statistical study ever conducted is believed to be for
The largest experimental statistical study ever conducted is believed to be for
 a. Cholera.
 b. Polio.
 c. Diphtheria.
  d. Malaria.
tmontes00   17   1 Reply
6 years ago
The major applications of data mining have been made by companies with a strong _______ focus.
The major applications of data mining have been made by companies with a strong _______ focus.
The major applications of data mining have been made by companies with a strong _______ focus.
 a. wholesale
 b. manufacturing
 c. consumer
  d. research and development
tmontes00   39   1 Reply
6 years ago
Some of the CDs produced by a manufacturer are defective. From the production line, 5 CDs are ...
Some of the CDs produced by a manufacturer are defective. From the production line, 5 CDs are ...
Some of the CDs produced by a manufacturer are defective. From the production line, 5 CDs are selected and inspected. How many sample points exist in this experiment?
 a. 10
  b. 25
  c. 30
  d. 32
tmontes00   32   2 Replies
6 years ago
The Poisson probability distribution is a
The Poisson probability distribution is a
The Poisson probability distribution is a
 a. continuous probability distribution.
  b. discrete probability distribution.
  c. uniform probability distribution.
  d. normal probability distribution.
tmontes00   80   1 Reply
6 years ago
X is a normally distributed random variable with a mean of 22 and a standard deviation of 5 . The ...
X is a normally distributed random variable with a mean of 22 and a standard deviation of 5 . The ...
x is a normally distributed random variable with a mean of 22 and a standard deviation of 5 . The probability that x is less than 9.7 is
 a. 0.000
  b. 0.4931
  c. 0.0069
  d. 0.9931
tmontes00   68   2 Replies
6 years ago
The average life expectancy of dishwashers produced by a company is 6 years with a standard ...
The average life expectancy of dishwashers produced by a company is 6 years with a standard ...
The average life expectancy of dishwashers produced by a company is 6 years with a standard deviation of 8 months. Assume that the lives of dishwashers are normally distributed.
 a. What is the probability that a randomly selected dishwasher wi
tmontes00   27   1 Reply
6 years ago
A population consists of 500 elements. We want to draw a simple random sample of 50 elements from ...
A population consists of 500 elements. We want to draw a simple random sample of 50 elements from ...
A population consists of 500 elements. We want to draw a simple random sample of 50 elements from this population. On the first selection, the probability of an element being selected is
 a. 0.100
  b. 0.010
  c. 0.001
  d. 0.002
tmontes00   57   2 Replies
3 years ago
The following data was collected from a simple random sample of a population. 13 15 14 16 12 The ...
The following data was collected from a simple random sample of a population. 13 15 14 16 12 The ...
The following data was collected from a simple random sample of a population. 13 15 14 16 12 The point estimate of the population standard deviation is
 a. 2.500
  b. 1.581
  c. 2.000
  d. 1.414
tmontes00   30   1 Reply
6 years ago
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