Question 1

What z-score value separates the highest 10% of the scores in a normal distribution from the lowest 90%?

Accepted Answer

A) z = 1.28 
B) z = 0.25 
C) z = -1.28 
D) z = -0.25 
A) z = 1.28 
B) z = 0.25 
C) z = -1.28 
D) z = -0.25

Question 2

What is the probability of randomly selecting a z-score greater than z = -0.75 from a normal distribution?

Accepted Answer

A) 0.7734 
B) 0.2266 
C) 0.2734 
D) 0.4532 
A) 0.7734 
B) 0.2266 
C) 0.2734 
D) 0.4532

Question 3

The proportion in the tail of a normal distribution can never be more than 0.50.

Accepted Answer

A) True 
 B)False

Question 4

A vertical line drawn through a normal distribution at z = -0.50 separates the distribution into two sections.The proportion in the larger section is 0.6915.

Accepted Answer

A) True 
 B)False

Question 5

When the z-score value in a normal distribution is negative,the body is on the right-hand side of the distribution.

Accepted Answer

A) True 
 B)False

Question 6

What proportion of a normal distribution is located in the tail beyond z = 1.50?

Accepted Answer

A) 0.9332 
B) 0.0668 
C) 0.4332 
D) 0.1336 
A) 0.9332 
B) 0.0668 
C) 0.4332 
D) 0.1336

Question 7

For any normal distribution,the probability of randomly selecting a z-score less than z = 1.40 is p = 0.9192.

Accepted Answer

A) True 
 B)False

Question 8

What is the probability of randomly selecting a z-score less than z = 1.25 from a normal distribution?

Accepted Answer

A) 0.8944 
B) 0.1056 
C) 0.3944 
D) 0.2112 
A) 0.8944 
B) 0.1056 
C) 0.3944 
D) 0.2112

Question 9

For a normal distribution with µ = 100 and σ = 20,the score that separates the top 60% of the distribution from the bottom 40% is X = 105.

Accepted Answer

A) True 
 B)False

Question 10

For a normal distribution,proportions in the right-hand tail are positive,and proportions in the left-hand tail are negative.

Accepted Answer

A) True 
 B)False

Question 11

A normal distribution has a mean of µ = 70 with σ = 12.If one score is randomly selected from this distribution,what is the probability that the score will be greater than X = 58?

Accepted Answer

A) 0.8413 
B) 0.1577 
C) 0.3413 
D) 0.6826 
A) 0.8413 
B) 0.1577 
C) 0.3413 
D) 0.6826

Question 12

John drives to work each morning,and the trip takes an average of µ = 38 minutes.The distribution of driving times is approximately normal with a standard deviation of σ = 5 minutes.For a randomly selected morning,what is the probability that John's drive to work will take between 36 and 40 minutes?

Accepted Answer

A) 0.0793 
B) 0.1526 
C) 0.1554 
D) 0.3108 
A) 0.0793 
B) 0.1526 
C) 0.1554 
D) 0.3108

Question 13

Scores on the SAT form a normal distribution with a mean of µ = 500 with σ = 100.If the state college only accepts students who score in the top 60% on the SAT,what is the minimum score needed to be accepted?

Accepted Answer

A) X = 475 
B) X = 525 
C) X = 440 
D) X = 560 
A) X = 475 
B) X = 525 
C) X = 440 
D) X = 560

Question 14

A normal distribution has a mean of µ = 100 with σ = 20.If one score is randomly selected from this distribution,what is the probability that the score will be less than X = 84?

Accepted Answer

A) 0.7881 
B) 0.5762 
C) 0.2881 
D) 0.2119 
A) 0.7881 
B) 0.5762 
C) 0.2881 
D) 0.2119

Question 15

A vertical line is drawn through a normal distribution at z = 0.80.What proportion of the distribution is on the right-hand side of the line?

Accepted Answer

A) 0.7881 
B) 0.2119 
C) 0.2881 
D) 0.5762 
A) 0.7881 
B) 0.2119 
C) 0.2881 
D) 0.5762

Question 16

Which of the following accurately describes the proportions in the tails of a normal distribution?

Accepted Answer

A) Proportions in the right-hand tail are greater than 0.50, and proportions in the left-hand tail are less than 0.50. 
B) Proportions in the right-hand tail are less than 0.50, and proportions in the left-hand tail are greater than 0.50. 
C) Proportions in both tails are less than 0.50. 
D) Proportions in both tails are greater than 0.50. 
A) Proportions in the right-hand tail are greater than 0.50, and proportions in the left-hand tail are less than 0.50. 
B) Proportions in the right-hand tail are less than 0.50, and proportions in the left-hand tail are greater than 0.50. 
C) Proportions in both tails are less than 0.50. 
D) Proportions in both tails are greater than 0.50.

Question 17

For a normal distribution with µ = 80 and σ = 10,the score that separates the bottom 10% of the distribution from the rest is 67.2

Accepted Answer

A) True 
 B)False

Question 18

A normal distribution has a mean of µ = 80 with σ = 20.What score separates the highest 15% of the distribution from the rest of the scores?

Accepted Answer

A) X = 59.2 
B) X = 100.8 
C) X = 95 
D) X = 65 
A) X = 59.2 
B) X = 100.8 
C) X = 95 
D) X = 65

Question 19

A normal distribution has a mean of µ = 70 with σ = 12.If one score is randomly selected from this distribution,what is the probability that the score will be greater than X = 55?

Accepted Answer

A) 0.3944 
B) 0.1056 
C) 0.8944 
D) 0.7888 
A) 0.3944 
B) 0.1056 
C) 0.8944 
D) 0.7888

Question 20

The tail is on the right side of a normal distribution for any z-score value greater than zero.

Accepted Answer

A) True 
 B)False

What z-score value separates the highest 10% of the scores in a normal distribution from the lowest 90%?

What is the probability of randomly selecting a z-score greater than z = -0.75 from a normal distribution?

The proportion in the tail of a normal distribution can never be more than 0.50.

A vertical line drawn through a normal distribution at z = -0.50 separates the distribution into two sections.The proportion in the larger section is 0.6915.

When the z-score value in a normal distribution is negative,the body is on the right-hand side of the distribution.

What proportion of a normal distribution is located in the tail beyond z = 1.50?

For any normal distribution,the probability of randomly selecting a z-score less than z = 1.40 is p = 0.9192.

What is the probability of randomly selecting a z-score less than z = 1.25 from a normal distribution?

For a normal distribution with µ = 100 and σ = 20,the score that separates the top 60% of the distribution from the bottom 40% is X = 105.

For a normal distribution,proportions in the right-hand tail are positive,and proportions in the left-hand tail are negative.

A normal distribution has a mean of µ = 70 with σ = 12.If one score is randomly selected from this distribution,what is the probability that the score will be greater than X = 58?

Scores on the SAT form a normal distribution with a mean of µ = 500 with σ = 100.If the state college only accepts students who score in the top 60% on the SAT,what is the minimum score needed to be accepted?

A normal distribution has a mean of µ = 100 with σ = 20.If one score is randomly selected from this distribution,what is the probability that the score will be less than X = 84?

A vertical line is drawn through a normal distribution at z = 0.80.What proportion of the distribution is on the right-hand side of the line?

Which of the following accurately describes the proportions in the tails of a normal distribution?

For a normal distribution with µ = 80 and σ = 10,the score that separates the bottom 10% of the distribution from the rest is 67.2

A normal distribution has a mean of µ = 80 with σ = 20.What score separates the highest 15% of the distribution from the rest of the scores?

A normal distribution has a mean of µ = 70 with σ = 12.If one score is randomly selected from this distribution,what is the probability that the score will be greater than X = 55?

The tail is on the right side of a normal distribution for any z-score value greater than zero.

Introduction to Statistics.

Frequency Distributions.

Central Tendency.

Variability.

z-Scores: Location of Scores and Standardized Distributions.

Probability and Samples: The Distribution of Sample Means.

Introduction to Hypothesis Testing.

Introduction to the t Statistic

The t Test for Two Independent Samples

The t Test for Two Related Samples

Introduction to Analysis of Variance

Repeated-Measures and Two-Factor Analysis of Variance

Correlation and Regression.

The Chi-Square Statistic: Tests for Goodness of Fit and Independence

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Exam 6: Probability.

What z-score value separates the highest 10% of the scores in a normal distribution from the lowest 90%?

What is the probability of randomly selecting a z-score greater than z = -0.75 from a normal distribution?

The proportion in the tail of a normal distribution can never be more than 0.50.

A vertical line drawn through a normal distribution at z = -0.50 separates the distribution into two sections.The proportion in the larger section is 0.6915.

When the z-score value in a normal distribution is negative,the body is on the right-hand side of the distribution.

What proportion of a normal distribution is located in the tail beyond z = 1.50?

For any normal distribution,the probability of randomly selecting a z-score less than z = 1.40 is p = 0.9192.

What is the probability of randomly selecting a z-score less than z = 1.25 from a normal distribution?

For a normal distribution with µ = 100 and σ = 20,the score that separates the top 60% of the distribution from the bottom 40% is X = 105.

For a normal distribution,proportions in the right-hand tail are positive,and proportions in the left-hand tail are negative.

A normal distribution has a mean of µ = 70 with σ = 12.If one score is randomly selected from this distribution,what is the probability that the score will be greater than X = 58?

Scores on the SAT form a normal distribution with a mean of µ = 500 with σ = 100.If the state college only accepts students who score in the top 60% on the SAT,what is the minimum score needed to be accepted?

A normal distribution has a mean of µ = 100 with σ = 20.If one score is randomly selected from this distribution,what is the probability that the score will be less than X = 84?

A vertical line is drawn through a normal distribution at z = 0.80.What proportion of the distribution is on the right-hand side of the line?

Which of the following accurately describes the proportions in the tails of a normal distribution?

For a normal distribution with µ = 80 and σ = 10,the score that separates the bottom 10% of the distribution from the rest is 67.2

A normal distribution has a mean of µ = 80 with σ = 20.What score separates the highest 15% of the distribution from the rest of the scores?

A normal distribution has a mean of µ = 70 with σ = 12.If one score is randomly selected from this distribution,what is the probability that the score will be greater than X = 55?

The tail is on the right side of a normal distribution for any z-score value greater than zero.

Introduction to Statistics.

Frequency Distributions.

Central Tendency.

Variability.

z-Scores: Location of Scores and Standardized Distributions.

Probability and Samples: The Distribution of Sample Means.

Introduction to Hypothesis Testing.

Introduction to the t Statistic

The t Test for Two Independent Samples

The t Test for Two Related Samples

Introduction to Analysis of Variance

Repeated-Measures and Two-Factor Analysis of Variance

Correlation and Regression.

The Chi-Square Statistic: Tests for Goodness of Fit and Independence

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