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 Quote from: 19614886 (3 years ago)Question 1 of 251.0 PointsFor a boxplot, the vertical line inside the box indicates the location of the A.mode    B.inter quartile range    C.mean    D.median   Reset SelectionDQuote from: 19614886 (3 years ago)Question 2 of 251.0 PointsThe staff at a small company includes: 4 secretaries, 20 technicians, 4 engineers, 2 executives, and 50 factory workers. If a person is selected at random, what is the probability that he or she is a factory worker? A.1/4    B.1/8    C.2/5    D.5/8   Reset SelectionTotal employees: =4+20+4+2+50 =80 There are 50 factory workers out of 80 employees, therefore: Probability of it being a factory worker = 50/80 Probability of it being a factory worker = .625 Probability of it being a factory worker = 62.5% (5/8)
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Here are a few more answers. Some questions changed recently.

Question 1 of 25
1.0/ 1.0 Points
Which of the following are the two most commonly used measures of variability?
A.Range and interquartile range
B.Variance and median
C.Mean and variance
Correct    D.Variance and standard deviation

Part 2 of 9 -   2.0/ 2.0 Points

Question 2 of 25
1.0/ 1.0 Points
Three cards are drawn from a deck without replacement. What is the probability that all three cards are clubs?
A.0.0156
B.0.012
C.0.25
Correct    D.0.0129

Question 3 of 25
1.0/ 1.0 Points
The formal way to revise probabilities based on new information is to use:
A.complementary probabilities
B.unilateral probabilities
C.common sense probabilities
Correct    D.conditional probabilities

Part 3 of 9 -   3.0/ 3.0 Points

Question 4 of 25
1.0/ 1.0 Points
Which of following statements are true regarding the probability distribution of a random variable X?
A.The probabilities must be nonnegative
B.The probabilities must sum to 1
C.The random variable must be continuous
Correct    D.Both (a) and (b)

Question 5 of 25
1.0/ 1.0 Points
The following data were obtained from a survey of college students. The variable X represents the number of non-assigned books read during the past six months.

x
0
1
2
3
4
5
P (X=x)
0.20
0.25
0.20
0.15
0.10
0.10

Find P(1 < X < 5)
A.0.70
B.0.20
C.0.30
Correct    D.0.45

Question 6 of 25
1.0/ 1.0 Points
A discrete probability distribution:
A.can be estimated from long-run proportions
B.is a tool that can be used to incorporate uncertainty into models
Correct    C.lists all of the possible values of the random variable and their corresponding probabilities
D.is the distribution of multiple random variables

Part 4 of 9 -   5.0/ 6.0 Points

Question 7 of 25
1.0/ 1.0 Points
The mean of a probability distribution is a:
A.measure of relative likelihood
B.measure of variability of the distribution
C.measure of skewness of the distribution
Correct    D.measure of central location

Question 8 of 25
0.0/ 1.0 Points
The mean of a probability distribution can be:
Incorrect    A.a positive number
B.a negative number
C.zero
D.all of the above

Question 9 of 25
1.0/ 1.0 Points
The theorem that states that the sampling distribution of the sample mean is approximately normal when the sample size n is reasonably large is known as the:
Correct    A.central limit theorem
B.simple random sample theorem
C.point estimate theorem
D.central tendency theorem

Question 10 of 25
1.0/ 1.0 Points
The average height of flowering cherry trees in a nursery is 11 feet. If the heights are normally distributed with a standard deviation of 1.6, find the probability that a randomly selected cherry tree in this nursery is less than 13 feet tall.
A. 0.67
Correct    B.0.89
C.0.95
D.0.11

Question 11 of 25
1.0/ 1.0 Points
Given that Z is a standard normal random variable, P(-1.0 < Z < 1.5) is
A.0.8413
Correct    B.0.7745
C.0.0919
D.0.9332

Question 12 of 25
1.0/ 1.0 Points
If Z is a standard normal random variable, then the value z for which P(-z < Z < z) equals 0.8764 is
A.1.16
B.3.08
Correct    C.1.54
D.0.3764

Part 5 of 9 -   1.0/ 1.0 Points

Question 13 of 25
1.0/ 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.

The histogram below represents scores achieved by 250 job applicants on a personality profile.

The histogram below represents scores achieved by 250 job applicants on a personality profile.

What percentage of the job applicants scored between 30 and 40?  Place your answer in the blank, rounded to 2 decimal places. Do not use a percentage sign (%). For example, 44.44 would be a legitimate answer.
Correct10.00

Part 6 of 9 -   2.0/ 2.0 Points

Question 14 of 25
1.0/ 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.

Ann is applying for a bank loan to open a pizza franchise. She must first complete a written application and then, if the written application is approved, be interviewed by bank officers. If an applicant’s written application is not approved the applicant is not granted an interview with the bank officers. Past records for this bank show that the probability of an applicant having his or her written application approved is 0.63. Records also indicate that the interviewing committee of bank officers approves 85% of the individuals they interview. Find the probability that Ann’s loan request is approved. Place your answer, rounded to 2 decimal places, in the blank. For example, 0.76 would be a legitimate entry.  Correct.54

Question 15 of 25
1.0/ 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.

Find the mean of the following probability distribution?

1
0.20
2
0.10
3
0.35
4
0.05
5
0.30

Place your answer, rounded to two decimal places, in the blank.  Correct3.15  When entering your answer do not use any labels or symbols other than a decimal point. Simply provide the numerical value. For example, 1.23 would be a legitimate entry.

Part 7 of 9 -   2.0/ 2.0 Points

Question 16 of 25
1.0/ 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.

A certain system has two components. There are 10 different models of the first component and 10 different of the second. Any first component can be paired with any second component. A salesman must select 2 of the first component and 3 of the second to take on a sales call. How many different systems can the salesman select? Place your answer in the blank. Do NOT use commas. For example, 2350 would be a legitimate response.  Correct5400

Question 17 of 25
1.0/ 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.

A restaurant menu has a price-fixed complete dinner that consists of an appetizer, entrée, beverage, and dessert. You have a choice of five appetizers, ten entrees, three beverages, and six desserts. How many possible complete dinners are possible? Place your answer, as a whole number—no decimal places—in the blank. For example 176 would be a legitimate entry  Correct900

Part 8 of 9 -   4.0/ 6.0 Points

Question 18 of 25
1.0/ 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.

A set of final exam scores in an organic chemistry course was found to be normally distributed, with a mean of 73 and a standard deviation of 8.

What is the probability of getting a score between 65 and 89 on this exam? Place your answer, rounded to 4 decimal places in the blank. For example, 0.3456 would be a legitimate entry.  Correct.8185

Question 19 of 25
1.0/ 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.

A popular retail store knows that the purchase amounts by its customers is a random variable that follows a normal distribution with a mean of \$30 and a standard deviation of \$9.

What is the probability that a randomly selected customer will spend less than \$15 at this store? Place your answer, rounded to 4 decimal places, in the blank. For example, 0.3456 would be a legitimate entry.  Correct.0478

Question 20 of 25
1.0/ 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.

The manufacturer of a new compact car claims the miles per gallon (mpg) for the gasoline consumption is mound shaped and symmetric with a mean of 25.9 mpg and a standard deviation of 9.5 mpg. If 30 such cars are tested, what is the probability the average mpg achieved by these 30 cars will be greater than 28? Place your answer, rounded to 4 decimal places, in the blank.  Correct.1130

Question 21 of 25
0.0/ 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.

A set of final exam scores in an organic chemistry course was found to be normally distributed, with a mean of 73 and a standard deviation of 8.

What is the probability of getting a score of 68 or less on this exam? Place your answer, rounded to 4 decimal places in the blank. For example, 0.3456 would be a legitimate entry.  Correct.5000

Question 22 of 25
1.0/ 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.

A Wendy’s fast-food restaurant sells hamburgers and chicken sandwiches. On a typical weekday, the demand for hamburgers is normally distributed with a mean of 450 and standard deviation of 80 and the demand for chicken sandwiches is normally distributed with a mean of 120 and standard deviation of 30.

How many chicken sandwiches must the restaurant stock to be 99% sure of not running out on a given day? Place you answer, rounded to the nearest whole number in the blank. For example, 345 would be a legitimate entry.  Correct190

Question 23 of 25
0.0/ 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.

Suppose that the average weekly earnings for employees in general automotive repair shops is \$450, and that the standard deviation for the weekly earnings for such employees is \$50. A sample of 100 such employees is selected at random.

Find the mean of the sampling distribution of the means of average weekly earnings for samples of size 100. Place your answer in the blank. Do not include a dollar sign. For example, 123 would be a legitimate entry.  Correct5

Part 9 of 9 -   2.0/ 2.0 Points

Question 24 of 25
1.0/ 1.0 Points
Using the standard normal curve, the Z- score representing the 99th percentile is 2.326.
Correct
True
False

Question 25 of 25
1.0/ 1.0 Points
The left half under the normal curve is slightly smaller than the right half.
Correct
True
False

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