The scores on the Wechsler Adult Intelligence Scale are approximately Normal, with F1F1F1S1F1F1F10 = 100 and F1F1F1S1F1F1F10 = 15. The proportion of adults with scores between 80 and 120 is closest to:

A) 0.50. B) 0.66. C) 0.82. D) 0.99. A) 0.50. B) 0.66. C) 0.82. D) 0.99.

The scores on the Wechsler Adult Intelligence Scale are approximately Normal, with F1F1F1S1F1F1F10 = 100 and F1F1F1S1F1F1F10 = 15. The proportion of adults with scores above 110 is closest to:

A) 0.08. B) 0.10. C) 0.25. D) 0.35. A) 0.08. B) 0.10. C) 0.25. D) 0.35.

The scores on the Wechsler Adult Intelligence Scale are approximately Normal, with F1F1F1S1F1F1F10 = 100 and F1F1F1S1F1F1F10 =15. If you scored 130, your score would be higher than approximately what percent of adults?

A) 92% B) 95% C) 97.5% D) 99.7% A) 92% B) 95% C) 97.5% D) 99.7%

Exam 4: The Normal Distributions

A high-profile consulting company chooses its new entry-level employees from a pool of recent college graduates using a five-step interview process. Unfortunately, there are usually more candidates who complete the interview process than the number of new positions that are available. As a result, cumulative GPA is used as a tie-breaker. GPAs for the successful interviewees are Normally distributed, with a mean of 3.3 and a standard deviation of 0.4. What proportion of candidates have a GPA under 3.0?

(Multiple Choice)

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Question 21

The duration (in days) of human pregnancies follows approximately the N(266, 16) distribution. How many days would a human pregnancy need to last to be among the top 10% of all pregnancy durations?

(Multiple Choice)

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Question 22

You recently took a statistics exam in a large class with n = 500 students. The instructor tells the class that the scores were Normally distributed, with a mean of 72 (out of 100) and a standard deviation of 8, but when you talk to other students in the class, you find out that more than 30 students have scores below 45. That violates which rule for the Normal distribution?

(Multiple Choice)

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Question 23

The scores on the Wechsler Adult Intelligence Scale are approximately Normal, with  = 100 and  = 15. The proportion of adults with scores between 80 and 120 is closest to:

(Multiple Choice)

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Question 24

Using the standard Normal distribution tables, the area under the standard Normal curve corresponding to Z > -1.62 is:

(Multiple Choice)

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Question 25

Using the standard Normal distribution tables, the area under the standard Normal curve corresponding to -0.5 < Z < 1.2 is:

(Multiple Choice)

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Question 26

Scores on a university exam are Normally distributed, with a mean of 78 and a standard deviation of 8. The professor teaching the class declares that a score of 70 or higher is required for a grade of at least C. Using the 68-95-99.7 rule, what percent of students score below 62?

(Multiple Choice)

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Question 27

Birth weights at a local hospital have a Normal distribution, with a mean of 110 oz and a standard deviation of 15 oz. The proportion of infants with birth weights above 125 oz is:

(Multiple Choice)

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Question 28

Scores on the SAT verbal test in recent years follow approximately the N(515, 109) distribution. How high must a student score in order to place in the top 5% of all students taking the SAT?

(Multiple Choice)

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Question 29

The duration (in days) of human pregnancies follows approximately the N(266,16) distribution. What proportion of pregnancy durations is more than 270 days?

(Multiple Choice)

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Question 30

You recently took a statistics exam in a large class. The instructor tells the class that the scores were Normally distributed, with a mean of 72 (out of 100) and a standard deviation of 12. Your score was 90. Your friend had a time conflict and took a course with another instructor. Your friend had a score of 75 on a test, with a mean of 60 and a standard deviation of 10. What can you conclude?

(Multiple Choice)

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Question 31

Scores on a university exam are Normally distributed, with a mean of 78 and a standard deviation of 8. The professor teaching the class declares that a score of 70 or higher is required for a grade of at least C. Using the 68-95-99.7 rule, what percent of students failed to earn a grade of at least C?

(Multiple Choice)

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Question 32

Birth weights at a local hospital have a Normal distribution, with a mean of 110 oz and a standard deviation of 15 oz. The proportion of infants with birth weights between 125 oz and 140 oz is:

(Multiple Choice)

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Question 33

A Normal distribution:

(Multiple Choice)

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Question 34

The scores on the Wechsler Adult Intelligence Scale are approximately Normal, with  = 100 and  = 15. The proportion of adults with scores above 110 is closest to:

(Multiple Choice)

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Question 35

The scores on the Wechsler Adult Intelligence Scale are approximately Normal, with  = 100 and  =15. If you scored 130, your score would be higher than approximately what percent of adults?

(Multiple Choice)

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(34)

Question 36

A high-profile consulting company chooses its new entry-level employees from a pool of recent college graduates using a five-step interview process. Unfortunately, there are usually more candidates who complete the interview process than the number of new positions that are available. As a result, cumulative GPA is used as a tie-breaker. GPAs for the successful interviewees are Normally distributed, with a mean of 3.3 and a standard deviation of 0.4. What percent of candidates have a GPA above 3.9?

(Multiple Choice)

4.8/5

(31)

Question 37

Showing 21 - 37 of 37

The duration (in days) of human pregnancies follows approximately the N(266, 16) distribution. How many days would a human pregnancy need to last to be among the top 10% of all pregnancy durations?

The scores on the Wechsler Adult Intelligence Scale are approximately Normal, with  = 100 and  = 15. The proportion of adults with scores between 80 and 120 is closest to:

Using the standard Normal distribution tables, the area under the standard Normal curve corresponding to Z > -1.62 is:

Using the standard Normal distribution tables, the area under the standard Normal curve corresponding to -0.5 < Z < 1.2 is:

Scores on a university exam are Normally distributed, with a mean of 78 and a standard deviation of 8. The professor teaching the class declares that a score of 70 or higher is required for a grade of at least C. Using the 68-95-99.7 rule, what percent of students score below 62?

Birth weights at a local hospital have a Normal distribution, with a mean of 110 oz and a standard deviation of 15 oz. The proportion of infants with birth weights above 125 oz is:

Scores on the SAT verbal test in recent years follow approximately the N(515, 109) distribution. How high must a student score in order to place in the top 5% of all students taking the SAT?

The duration (in days) of human pregnancies follows approximately the N(266,16) distribution. What proportion of pregnancy durations is more than 270 days?

Birth weights at a local hospital have a Normal distribution, with a mean of 110 oz and a standard deviation of 15 oz. The proportion of infants with birth weights between 125 oz and 140 oz is:

A Normal distribution:

The scores on the Wechsler Adult Intelligence Scale are approximately Normal, with  = 100 and  = 15. The proportion of adults with scores above 110 is closest to:

The scores on the Wechsler Adult Intelligence Scale are approximately Normal, with  = 100 and  =15. If you scored 130, your score would be higher than approximately what percent of adults?

Getting Started

Picturing Distributions With Graphs

Describing Distributions With Numbers

Scatterplots and Correlation

Two-Way Tables

Producing Data- Sampling

Producing Data- Experiments

Data Ethics

Introducing Probability

General Rules of Probability

Binomial Distributions

Inference for Regression

One-Way Analysis of Variance- Comparing Several Means

Nonparametric Tests

More on Analysis of Variance

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