Question 1

A jar contains 10 red marbles and 30 blue marbles.What is the probability of randomly selecting a red marble from the jar?​

Accepted Answer

A) ​10/30 
B) ​10/40 
C) ​1/10 
D) ​1/40 
A) ​10/30 
B) ​10/40 
C) ​1/10 
D) ​1/40

Question 2

What proportion of a normal distribution is located in the tail below z = 2.00?​

Accepted Answer

A) ​0.9772 
B) ​0.0228 
C) ​0.4772 
D) ​0.0456 
A) ​0.9772 
B) ​0.0228 
C) ​0.4772 
D) ​0.0456

Question 3

What proportion of a normal distribution is located between z = -1.50 and z = +1.50?​

Accepted Answer

A) ​0.9332 
B) ​0.0668 
C) ​0.4332 
D) ​0.8664 
A) ​0.9332 
B) ​0.0668 
C) ​0.4332 
D) ​0.8664

Question 4

For a normal distribution,the proportion in the tail below z = -2.00 is equal to 0.0228.

Accepted Answer

A) True 
 B)False

Question 5

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 less than 35 minutes?​

Accepted Answer

A) ​0.6554 
B) ​0.3446 
C) ​0.7257 
D) ​0.2743 
A) ​0.6554 
B) ​0.3446 
C) ​0.7257 
D) ​0.2743

Question 6

A normal distribution has a mean of µ = 24 with σ = 3.What is the minimum score needed to be in the top 14% of the distribution?​

Accepted Answer

A) ​X = 20.76 
B) ​X = 27.24 
C) ​X = 25.08 
D) ​X = 24.42 
A) ​X = 20.76 
B) ​X = 27.24 
C) ​X = 25.08 
D) ​X = 24.42

Question 7

Under what circumstances does the binomial distribution approximate a normal distribution?​

Accepted Answer

A) ​when pn > 10 
B) ​when qn > 10 
C) ​when pn and qn are both > 10 
D) ​when npq > 10 
A) ​when pn > 10 
B) ​when qn > 10 
C) ​when pn and qn are both > 10 
D) ​when npq > 10

Question 8

A normal distribution has µ = 80 and σ = 10.What is the probability of randomly selecting a score greater than 90 from this distribution?​

Accepted Answer

A) ​p = 0.8413 
B) ​p = 0.1587 
C) ​p = 0.3085 
D) ​p = 0.6915 
A) ​p = 0.8413 
B) ​p = 0.1587 
C) ​p = 0.3085 
D) ​p = 0.6915

Question 9

A vertical line is drawn through a normal distribution at z = 1.20.What proportion of the distribution is on the left-hand side of the line?​

Accepted Answer

A) ​0.8849 
B) ​0.1151 
C) ​0.3849 
D) ​0.7698 
A) ​0.8849 
B) ​0.1151 
C) ​0.3849 
D) ​0.7698

Question 10

What proportion of a normal distribution is located between the mean and z = -0.40?​

Accepted Answer

A) ​0.6554 
B) ​0.3446 
C) ​0.1554 
D) ​0.3108 
A) ​0.6554 
B) ​0.3446 
C) ​0.1554 
D) ​0.3108

Question 11

For any normal distribution,exactly 97.50% of the z-score values are less than z = 1.96.

Accepted Answer

A) True 
 B)False

Question 12

A multiple-choice test with 48 questions has four choices for each question.What is the probability of getting more than 12 questions correct by just guessing?​

Accepted Answer

A) ​0.5000 
B) ​0.4325 
C) ​0.5675 
D) ​0.0675 
A) ​0.5000 
B) ​0.4325 
C) ​0.5675 
D) ​0.0675

Question 13

A vertical line drawn through a normal distribution at z = -0.80 will separate the distribution into two sections.The proportion in the larger section is 7881.​

Accepted Answer

A) True 
 B)False

Question 14

What z-score value separates the top 70% of a normal distribution from the bottom 30%?​

Accepted Answer

A) ​z = 0.52 
B) ​z = 0.84 
C) ​z = -0.52 
D) ​z = -0.84 
A) ​z = 0.52 
B) ​z = 0.84 
C) ​z = -0.52 
D) ​z = -0.84

Question 15

A binomial distribution with p = 2/3 and n = 24 meets the criterion for using the normal approximation.

Accepted Answer

A) True 
 B)False

Question 16

A jar contains 10 red marbles and 20 blue marbles.If you take a random sample with replacement of two marbles from this jar and the first marble is blue,then the probability that the second marble is blue is p = 19/29.

Accepted Answer

A) True 
 B)False

Question 17

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 18

What z-score value separates the top 10% of a normal distribution from the bottom 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 19

What proportion of a normal distribution is located between the mean and z = 1.40?​

Accepted Answer

A) ​0.9192 
B) ​0.0808 
C) ​0.4192 
D) ​0.8384 
A) ​0.9192 
B) ​0.0808 
C) ​0.4192 
D) ​0.8384

Question 20

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 less 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

A jar contains 10 red marbles and 30 blue marbles.What is the probability of randomly selecting a red marble from the jar?

What proportion of a normal distribution is located in the tail below z = 2.00?

What proportion of a normal distribution is located between z = -1.50 and z = +1.50?

For a normal distribution,the proportion in the tail below z = -2.00 is equal to 0.0228.

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 less than 35 minutes?

A normal distribution has a mean of µ = 24 with σ = 3.What is the minimum score needed to be in the top 14% of the distribution?

Under what circumstances does the binomial distribution approximate a normal distribution?

A normal distribution has µ = 80 and σ = 10.What is the probability of randomly selecting a score greater than 90 from this distribution?

A vertical line is drawn through a normal distribution at z = 1.20.What proportion of the distribution is on the left-hand side of the line?

What proportion of a normal distribution is located between the mean and z = -0.40?

For any normal distribution,exactly 97.50% of the z-score values are less than z = 1.96.

A multiple-choice test with 48 questions has four choices for each question.What is the probability of getting more than 12 questions correct by just guessing?

A vertical line drawn through a normal distribution at z = -0.80 will separate the distribution into two sections.The proportion in the larger section is 7881.

What z-score value separates the top 70% of a normal distribution from the bottom 30%?

A binomial distribution with p = 2/3 and n = 24 meets the criterion for using the normal approximation.

A jar contains 10 red marbles and 20 blue marbles.If you take a random sample with replacement of two marbles from this jar and the first marble is blue,then the probability that the second marble is blue is p = 19/29.

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

What z-score value separates the top 10% of a normal distribution from the bottom 90%?

What proportion of a normal distribution is located between the mean and z = 1.40?

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 less than X = 55?

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 Analysis of Variance Anova

Two-Factor Analysis of Variance Independent Measures

Correlation

Introduction to Regression

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

The Binomial Test

Filters

Exam 6: Probability

A jar contains 10 red marbles and 30 blue marbles.What is the probability of randomly selecting a red marble from the jar?​

What proportion of a normal distribution is located in the tail below z = 2.00?​

What proportion of a normal distribution is located between z = -1.50 and z = +1.50?​

For a normal distribution,the proportion in the tail below z = -2.00 is equal to 0.0228.

A normal distribution has a mean of µ = 24 with σ = 3.What is the minimum score needed to be in the top 14% of the distribution?​

Under what circumstances does the binomial distribution approximate a normal distribution?​

A normal distribution has µ = 80 and σ = 10.What is the probability of randomly selecting a score greater than 90 from this distribution?​

A vertical line is drawn through a normal distribution at z = 1.20.What proportion of the distribution is on the left-hand side of the line?​

What proportion of a normal distribution is located between the mean and z = -0.40?​

For any normal distribution,exactly 97.50% of the z-score values are less than z = 1.96.

A multiple-choice test with 48 questions has four choices for each question.What is the probability of getting more than 12 questions correct by just guessing?​

A vertical line drawn through a normal distribution at z = -0.80 will separate the distribution into two sections.The proportion in the larger section is 7881.​

What z-score value separates the top 70% of a normal distribution from the bottom 30%?​

A binomial distribution with p = 2/3 and n = 24 meets the criterion for using the normal approximation.

A jar contains 10 red marbles and 20 blue marbles.If you take a random sample with replacement of two marbles from this jar and the first marble is blue,then the probability that the second marble is blue is p = 19/29.

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

What z-score value separates the top 10% of a normal distribution from the bottom 90%?​

What proportion of a normal distribution is located between the mean and z = 1.40?​

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 less than X = 55?​

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 Analysis of Variance Anova

Two-Factor Analysis of Variance Independent Measures

Correlation

Introduction to Regression

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

The Binomial Test

Filters

A jar contains 10 red marbles and 30 blue marbles.What is the probability of randomly selecting a red marble from the jar?

What proportion of a normal distribution is located in the tail below z = 2.00?

What proportion of a normal distribution is located between z = -1.50 and z = +1.50?

A normal distribution has a mean of µ = 24 with σ = 3.What is the minimum score needed to be in the top 14% of the distribution?

Under what circumstances does the binomial distribution approximate a normal distribution?

A normal distribution has µ = 80 and σ = 10.What is the probability of randomly selecting a score greater than 90 from this distribution?

A vertical line is drawn through a normal distribution at z = 1.20.What proportion of the distribution is on the left-hand side of the line?

What proportion of a normal distribution is located between the mean and z = -0.40?

A multiple-choice test with 48 questions has four choices for each question.What is the probability of getting more than 12 questions correct by just guessing?

A vertical line drawn through a normal distribution at z = -0.80 will separate the distribution into two sections.The proportion in the larger section is 7881.

What z-score value separates the top 70% of a normal distribution from the bottom 30%?

What z-score value separates the top 10% of a normal distribution from the bottom 90%?

What proportion of a normal distribution is located between the mean and z = 1.40?

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 less than X = 55?