Exam 6: Probability.

A vertical line drawn through a normal distribution at z = -1.00 separates the distribution into two sections,the body and the tail.What proportion of the distribution is in the tail?

(Multiple Choice)

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Question 21

A normal distribution has a mean of µ = 40 with σ = 8.If one score is randomly selected from this distribution,what is the probability that the score will be less than X = 34?

(Multiple Choice)

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Question 22

IQ scores form a normal distribution with µ = 100 and σ = 15.Individuals with IQs between 90 and110 are classified as average.What proportion of the population is average?

(Multiple Choice)

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Question 23

A normal distribution has a mean of µ = 40 with σ = 10.If a vertical line is drawn through the distribution at X = 55,what proportion of the scores are on the right side of the line?

(Multiple Choice)

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Question 24

For any normal distribution,the proportion in the tail beyond z = 2.00 is p = 0.0228.

(True/False)

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Question 25

For a normal distribution,the z-score boundary that separates the highest 2.5% of the scores from the rest is z = -1.96.

(True/False)

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Question 26

A vertical line drawn through a normal distribution at z = -0.75 separates the distribution into two sections.The proportion in the smaller section is 0.2734.

(True/False)

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Question 27

For a normal distribution,the proportion in the tail beyond z = 0.30 is p = 0.1179.

(True/False)

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Question 28

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 have a value between X = 90 and X = 120?

(Multiple Choice)

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Question 29

A vertical line drawn through a normal distribution at z = 0.50 separates the distribution into two sections,the body and the tail.What proportion of the distribution is in the tail?

(Multiple Choice)

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Question 30

What proportion of a normal distribution is located between z = 0 and z = +1.50?

(Multiple Choice)

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Question 31

If one score is randomly selected from a normal distribution with µ = 100 and σ = 20,the probability of obtaining a score less than X = 95 is p = 0.4013.

(True/False)

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Question 32

A vertical line drawn through a normal distribution at z = 1.40 divides the distribution into two sections.The proportion in the smaller section is 0.0808.

(True/False)

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Question 33

For a normal distribution,the proportion located between z = -1.00 and z = +1.00 is p = 34.13%

(True/False)

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Question 34

A jar contains 10 red marbles and 20 blue marbles.If you take a random sample 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.

(True/False)

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Question 35

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 = 76?

(Multiple Choice)

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Question 36

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

(Multiple Choice)

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Question 37

A normal distribution has a mean of µ = 40 with σ = 10.If a vertical line is drawn through the distribution at X = 35,what proportion of the scores are on the left side of the line?

(Multiple Choice)

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Question 38

For a normal distribution with µ = 500 and σ = 100,find the following values: a.What X value separates the highest 10% of the distribution from the rest of the scores? b.What X values form the boundaries for the middle 60% of the distribution? c.What is the probability of randomly selecting a score greater than X = 475?

(Short Answer)

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Question 39

A class consists of 10 male and 30 female students.A random sample of n = 3 students is selected.If the first two students are both females,what is the probability that the third student is a male?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 84

A vertical line drawn through a normal distribution at z = -1.00 separates the distribution into two sections,the body and the tail.What proportion of the distribution is in the tail?

A normal distribution has a mean of µ = 40 with σ = 8.If one score is randomly selected from this distribution,what is the probability that the score will be less than X = 34?

IQ scores form a normal distribution with µ = 100 and σ = 15.Individuals with IQs between 90 and110 are classified as average.What proportion of the population is average?

A normal distribution has a mean of µ = 40 with σ = 10.If a vertical line is drawn through the distribution at X = 55,what proportion of the scores are on the right side of the line?

For any normal distribution,the proportion in the tail beyond z = 2.00 is p = 0.0228.

For a normal distribution,the z-score boundary that separates the highest 2.5% of the scores from the rest is z = -1.96.

A vertical line drawn through a normal distribution at z = -0.75 separates the distribution into two sections.The proportion in the smaller section is 0.2734.

For a normal distribution,the proportion in the tail beyond z = 0.30 is p = 0.1179.

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 have a value between X = 90 and X = 120?

A vertical line drawn through a normal distribution at z = 0.50 separates the distribution into two sections,the body and the tail.What proportion of the distribution is in the tail?

What proportion of a normal distribution is located between z = 0 and z = +1.50?

If one score is randomly selected from a normal distribution with µ = 100 and σ = 20,the probability of obtaining a score less than X = 95 is p = 0.4013.

A vertical line drawn through a normal distribution at z = 1.40 divides the distribution into two sections.The proportion in the smaller section is 0.0808.

For a normal distribution,the proportion located between z = -1.00 and z = +1.00 is p = 34.13%

A jar contains 10 red marbles and 20 blue marbles.If you take a random sample 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.

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 = 76?

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

A normal distribution has a mean of µ = 40 with σ = 10.If a vertical line is drawn through the distribution at X = 35,what proportion of the scores are on the left side of the line?

A class consists of 10 male and 30 female students.A random sample of n = 3 students is selected.If the first two students are both females,what is the probability that the third student is a male?

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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