Question 1

On all normal curves the area between the mean and +1 standard deviation will be

Accepted Answer

A) about 34% of the total areA. 
B) about 68% of the total area. 
C) about 95% of the total area. 
D) about 99% of the total area. 
A) about 34% of the total areA. 
B) about 68% of the total area. 
C) about 95% of the total area. 
D) about 99% of the total area.

Question 2

On all normal curves the area between the mean and $\pm$2 standard deviations will be

Accepted Answer

A) about 34% of the total area 
B) about 95% of the total area 
C) less than 50% of the total area 
D) about 68% of the total area 
A) about 34% of the total area 
B) about 95% of the total area 
C) less than 50% of the total area 
D) about 68% of the total area

Question 3

A sample of university students has an average GPA of 2.78 with a standard deviation of 0.45.If GPA is normally distributed,what percentage of the students has GPAs
 $\begin{array}{|l|l|l|l|l|}
\hline & & Z \text { score } &\quad\quad\quad & \text { Area } \
\hline \text { a. } & \text { Less than } 2.30 ? & & & \
\hline \text { b. } & \text { Less than } 2.00 ? & & & \
\hline \text { c. } & \text { more than } 2.00 ? & & & \
\hline \text { d. } & \text { more than } 3.00 ? & & & \
\hline \text { e. } & \text { between } 2.50 \text { and } 3.50 ? & & & \
\hline \text { f. } & \text { between } 2.00 \text { and } 2.50 ? & & & \

\hline
\end{array}$

Accepted Answer

None

Question 4

If a Z score is 0,then the value of the corresponding raw score would be

Accepted Answer

A) 0. 
B) the same as the mean of the empirical distribution. 
C) the same as the standard deviation of the empirical distribution. 
D) probably a negative number. 
A) 0. 
B) the same as the mean of the empirical distribution. 
C) the same as the standard deviation of the empirical distribution. 
D) probably a negative number.

Question 5

The probability that a randomly selected case will have a score beyond$\pm$1.00 standard deviation of the mean is

Accepted Answer

A) 0.6826. 
B) 0.5000. 
C) 0.3174. 
D) 1/2 of the area of 1 standard deviation. 
A) 0.6826. 
B) 0.5000. 
C) 0.3174. 
D) 1/2 of the area of 1 standard deviation.

Question 6

As used in the social sciences,probabilities are a type of ____ which can vary from ____.

Accepted Answer

A) percentage;0 to 1 
B) fraction;0 to 100 
C) proportion;0.00 to 1.00 
D) Z score;0 to infinity 
A) percentage;0 to 1 
B) fraction;0 to 100 
C) proportion;0.00 to 1.00 
D) Z score;0 to infinity

Question 7

The standardized normal distribution (or Z distribution)has

Accepted Answer

A) a mean of 0 and a standard deviation of 1. 
B) a mean of 1 and a standard deviation of 0. 
C) a mean equal to the average of the scores and a standard deviation equal to the mean. 
D) a mean of 1 and a standard deviation of 1. 
A) a mean of 0 and a standard deviation of 1. 
B) a mean of 1 and a standard deviation of 0. 
C) a mean equal to the average of the scores and a standard deviation equal to the mean. 
D) a mean of 1 and a standard deviation of 1.

Question 8

A social researcher has constructed a measure of racial prejudice and obtained a distribution of scores on this measure from a randomly selected sample of public office holders.The scores were normally distributed with a mean of 45 and a standard deviation of 7.What is the probability that a randomly selected case from the sample will have a score less than 38?

Accepted Answer

A) 0.4526 
B) 0.5018 
C) 0.5200 
D) 0.1587 
A) 0.4526 
B) 0.5018 
C) 0.5200 
D) 0.1587

Question 9

The Z score table gives the area between a score and the mean.For a Z score of -1.00 that area (in percentages)is

Accepted Answer

A) 34.13%. 
B) -34.13%. 
C) 68.26%. 
D) -68.26%. 
A) 34.13%. 
B) -34.13%. 
C) 68.26%. 
D) -68.26%.

Question 10

To obtain the area below a positive Z score or above a negative Z score you would

Accepted Answer

A) subtract the value of the Z score from the mean. 
B) subtract the area in the "Area Beyond Z" column of the Z score table from 50%. 
C) add the value of the Z score to the area beyond the mean. 
D) add the area between the Z score and the mean to 50%. 
A) subtract the value of the Z score from the mean. 
B) subtract the area in the "Area Beyond Z" column of the Z score table from 50%. 
C) add the value of the Z score to the area beyond the mean. 
D) add the area between the Z score and the mean to 50%.

Question 11

A sample of university students has an average GPA of 2.78 with a standard deviation of 0.45.What is the probability that a randomly selected student will have a GPA
 $\begin{array}{|l|l|l|l|l|}
\hline & & \text { Z score } &\quad\quad & \text { Probability } \
\hline \text { a. } & \text { Lessthan } 3.40 \text { ? } & & & \
\hline \text { b. } & \text { Lessthan } 3.78 \text { ? } & & & \
\hline \text { c. } & \text { more than } 3.50 \text { ? } & & & \
\hline \text { d. } & \text { more than } 2.50 ? & & & \
\hline \text { e. } & \text { bbetween } 2.00 \text { and } 3.00 ? & & \
\hline \text { f. } & \text { between } 3.00 \text { and } 3.50 ? & & & \

\hline
\end{array}$

Accepted Answer

None

Question 12

The area between the mean and a Z score of +1.50 is 43.32%.This score is less than ____ of the scores in the distribution.

Accepted Answer

A) 43.32% 
B) 6.68% 
C) 3.32% 
D) 93.32% 
A) 43.32% 
B) 6.68% 
C) 3.32% 
D) 93.32%

Question 13

The probability of getting a 1 in a single toss of a six sided die would be

Accepted Answer

A) 2 to 1. 
B) 60 to 1. 
C) 1 in 6. 
D) impossible to estimate with the information given. 
A) 2 to 1. 
B) 60 to 1. 
C) 1 in 6. 
D) impossible to estimate with the information given.

Question 14

The tails of the theoretical normal curve

Accepted Answer

A) intersect with the horizontal axis between the 4th and 5th standard deviation. 
B) intersect with the horizontal axis beyond the 5th standard deviation. 
C) never touch the horizontal axis. 
D) maintain the same distance above the horizontal axis beyond the 3rd standard deviation. 
A) intersect with the horizontal axis between the 4th and 5th standard deviation. 
B) intersect with the horizontal axis beyond the 5th standard deviation. 
C) never touch the horizontal axis. 
D) maintain the same distance above the horizontal axis beyond the 3rd standard deviation.

Question 15

Unlike empirical distribution,the theoretical normal curve is

Accepted Answer

A) positively skewed. 
B) negatively skewed. 
C) bimodal. 
D) perfectly symmetrical. 
A) positively skewed. 
B) negatively skewed. 
C) bimodal. 
D) perfectly symmetrical.

Question 16

The area between the mean and a Z score of +1.50 is 43.32%.This score is higher than ____ of the scores in the distribution.

Accepted Answer

A) 43.32% 
B) 51.50% 
C) 57.68% 
D) 93.32% 
A) 43.32% 
B) 51.50% 
C) 57.68% 
D) 93.32%

Question 17

The area between two negative Z scores can be found by

Accepted Answer

A) adding the Z scores and finding the area below the total Z score. 
B) subtracting the Z scores and finding the total area above the total Z score. 
C) finding the area between each Z score and the mean and subtracting the smaller area from the larger. 
D) finding the area between each Z score and the mean and adding the areas. 
A) adding the Z scores and finding the area below the total Z score. 
B) subtracting the Z scores and finding the total area above the total Z score. 
C) finding the area between each Z score and the mean and subtracting the smaller area from the larger. 
D) finding the area between each Z score and the mean and adding the areas.

Question 18

The mean on a standardized test is 100 and the standard deviation is 35.Your score is 65.What percentage of the scores were higher than yours?

Accepted Answer

A) about 84% 
B) no more than 50% 
C) about 34% 
D) about 16% 
A) about 84% 
B) no more than 50% 
C) about 34% 
D) about 16%

Question 19

A Z score of -2.00 indicates a score that lies

Accepted Answer

A) two standard deviation units to the right of the mean. 
B) two standard deviation units to the left of the mean. 
C) 0.5 of one standard deviation unit on each side of the mean. 
D) any of these are possible depending on the value of the mean. 
A) two standard deviation units to the right of the mean. 
B) two standard deviation units to the left of the mean. 
C) 0.5 of one standard deviation unit on each side of the mean. 
D) any of these are possible depending on the value of the mean.

Question 20

If a Z score is +1.00,then the value of the corresponding raw score would be

Accepted Answer

A) 0. 
B) the same as the mean of the empirical distribution. 
C) equal to the mean of the empirical distribution plus one standard deviation. 
D) probably a negative number. 
A) 0. 
B) the same as the mean of the empirical distribution. 
C) equal to the mean of the empirical distribution plus one standard deviation. 
D) probably a negative number.

On all normal curves the area between the mean and +1 standard deviation will be

On all normal curves the area between the mean and $\pm$ 2 standard deviations will be

If a Z score is 0,then the value of the corresponding raw score would be

The probability that a randomly selected case will have a score beyond $\pm$ 1.00 standard deviation of the mean is

As used in the social sciences,probabilities are a type of which can vary from .

The standardized normal distribution (or Z distribution)has

The Z score table gives the area between a score and the mean.For a Z score of -1.00 that area (in percentages)is

To obtain the area below a positive Z score or above a negative Z score you would

The area between the mean and a Z score of +1.50 is 43.32%.This score is less than ____ of the scores in the distribution.

The probability of getting a 1 in a single toss of a six sided die would be

The tails of the theoretical normal curve

Unlike empirical distribution,the theoretical normal curve is

The area between the mean and a Z score of +1.50 is 43.32%.This score is higher than ____ of the scores in the distribution.

The area between two negative Z scores can be found by

The mean on a standardized test is 100 and the standard deviation is 35.Your score is 65.What percentage of the scores were higher than yours?

A Z score of -2.00 indicates a score that lies

If a Z score is +1.00,then the value of the corresponding raw score would be

Introduction

Basic Descriptive Statistics: Percentages Ratios and Rates Frequency Distributions

Charts and Graphs

Measures of Central Tendency

Measures of Dispersion

Introduction in Inferential Statistics, the Sampling Distribution, and Estimation

Hypothesis Testing I: the One-Sample Case

Hypothesis Testing II: the Two-Sample Case

Hypothesis Testing III: the Analysis of Variance

Hypothesis Testing Iv: Chi Square

Introduction to Bivariate Association and Measures of Association for Variables Measured at the Nominal Level

Association Between Variables Measured at the Ordinal Level

Association Between Variables Measured at the Interval-Ratio Level

Partial Correlation and Multiple Regression and Correlation

Filters

Exam 6: The Normal Curve

On all normal curves the area between the mean and +1 standard deviation will be

On all normal curves the area between the mean and ±\pm± 2 standard deviations will be

If a Z score is 0,then the value of the corresponding raw score would be

The probability that a randomly selected case will have a score beyond ±\pm± 1.00 standard deviation of the mean is

As used in the social sciences,probabilities are a type of ____ which can vary from ____.

The standardized normal distribution (or Z distribution)has

The Z score table gives the area between a score and the mean.For a Z score of -1.00 that area (in percentages)is

To obtain the area below a positive Z score or above a negative Z score you would

The area between the mean and a Z score of +1.50 is 43.32%.This score is less than ____ of the scores in the distribution.

The probability of getting a 1 in a single toss of a six sided die would be

The tails of the theoretical normal curve

Unlike empirical distribution,the theoretical normal curve is

The area between the mean and a Z score of +1.50 is 43.32%.This score is higher than ____ of the scores in the distribution.

The area between two negative Z scores can be found by

The mean on a standardized test is 100 and the standard deviation is 35.Your score is 65.What percentage of the scores were higher than yours?

A Z score of -2.00 indicates a score that lies

If a Z score is +1.00,then the value of the corresponding raw score would be

Introduction

Basic Descriptive Statistics: Percentages Ratios and Rates Frequency Distributions

Charts and Graphs

Measures of Central Tendency

Measures of Dispersion

Introduction in Inferential Statistics, the Sampling Distribution, and Estimation

Hypothesis Testing I: the One-Sample Case

Hypothesis Testing II: the Two-Sample Case

Hypothesis Testing III: the Analysis of Variance

Hypothesis Testing Iv: Chi Square

Introduction to Bivariate Association and Measures of Association for Variables Measured at the Nominal Level

Association Between Variables Measured at the Ordinal Level

Association Between Variables Measured at the Interval-Ratio Level

Partial Correlation and Multiple Regression and Correlation

Filters

On all normal curves the area between the mean and $\pm$ 2 standard deviations will be

The probability that a randomly selected case will have a score beyond $\pm$ 1.00 standard deviation of the mean is

As used in the social sciences,probabilities are a type of which can vary from .