Question 1

The asymptotic tails in a normal distribution represent the possibility of outliers in a data set.

Accepted Answer

A) True 
 B)False  True

Question 2

A researcher measures the number of tasks completed by participants during a 5-minute multitasking session.If the number of tasks completed is distributed normally as 6.3   1.0 (M   SD)tasks,then what is the probability that participants completed less than 8 tasks?

Accepted Answer

A) .0446 
B) .9554 
C) .4554 
D) The probability is not listed in the unit normal table. 
A) .0446 
B) .9554 
C) .4554 
D) The probability is not listed in the unit normal table. B

Question 3

A researcher records the following response times to a visual stimulus: 23   3.1 (M   SD)seconds.Assuming these data are normally distributed,what is the probability that participants responded in 20 seconds or less?

Accepted Answer

A) .1660 
B) .3340 
C) .6660 
D) The probability is not listed in the unit normal table. 
A) .1660 
B) .3340 
C) .6660 
D) The probability is not listed in the unit normal table. A

Question 4

The standard normal distribution is normally distributed with a mean of ____ and a variance of ____.

Accepted Answer

A) 0;1 
B) 1;0 
C) any value;any positive value 
D) any positive value;any value 
A) 0;1 
B) 1;0 
C) any value;any positive value 
D) any positive value;any value

Question 5

A professor records the following final exam scores: 78   7 (M   SD).Students scoring in the top 14% get an A.What is the cutoff score for the top 14% in this example?

Accepted Answer

A) 1.08 
B) 70.44 
C) 85.56 
D) There is not enough information to answer this question. 
A) 1.08 
B) 70.44 
C) 85.56 
D) There is not enough information to answer this question.

Question 6

The z score cutoff for the top 50 percent of scores in any normal distribution is 0.

Accepted Answer

A) True 
 B)False

Question 7

What is the implication for the tails of a normal distribution being asymptotic?

Accepted Answer

A) that scores above the mean are distributed the same as scores below the mean 
B) that extreme scores are possible in a normal distribution 
C) that there are an infinite number of possible normal distributions 
D) that this characteristic has no practical implication 
A) that scores above the mean are distributed the same as scores below the mean 
B) that extreme scores are possible in a normal distribution 
C) that there are an infinite number of possible normal distributions 
D) that this characteristic has no practical implication

Question 8

The binomial probability distribution is distributed with    ,and    =   .

Accepted Answer

A) True 
 B)False

Question 9

State whether the first area is bigger,the second area is bigger,or the two areas are equal: the area to the left of z = 0.80,or the area to the right of z = -0.80.

Accepted Answer

A) The first area is bigger. 
B) The second area is bigger. 
C) The two areas are the same. 
A) The first area is bigger. 
B) The second area is bigger. 
C) The two areas are the same.

Question 10

Most behavioral phenomena are believed to approximate the normal distribution.

Accepted Answer

A) True 
 B)False

Question 11

The following distribution most closely approximates a

Accepted Answer

A) normal distribution 
B) positively skewed distribution 
C) negatively skewed distribution 
D) multimodal distribution 
A) normal distribution 
B) positively skewed distribution 
C) negatively skewed distribution 
D) multimodal distribution

Question 12

A researcher finds that the average preschool-aged child drinks two cups of milk per day.Assuming these data are normally distributed,the z score for the average cups per day in this example is

Accepted Answer

A) less than 0 
B) greater than 0 
C) exactly equal to 0 
D) There is not enough information to answer this question. 
A) less than 0 
B) greater than 0 
C) exactly equal to 0 
D) There is not enough information to answer this question.

Question 13

For a set of data with 5±1.5,at least 95% of scores are greater than 3.0.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following is not a step to locate a proportion in a normal distribution?

Accepted Answer

A) Transform a raw score (x)into a z score. 
B) Locate the corresponding proportion for the z score in the unit normal table. 
C) Convert a proportion to a standard normal z score. 
A) Transform a raw score (x)into a z score. 
B) Locate the corresponding proportion for the z score in the unit normal table. 
C) Convert a proportion to a standard normal z score.

Question 15

Data are normally distributed as 12.5    0.5 (M    SD).A score of 13.2 marks the top 33% of scores in this distribution.

Accepted Answer

A) True 
 B)False

Question 16

All z scores above the mean are positive,whereas all z scores below the mean are negative.

Accepted Answer

A) True 
 B)False

Question 17

A parent decides to reward her child if he eats an average of at least five bites of his vegetables at dinner during the first week.She finds that her child ate 4   0.8 (M   SD)bites per meal for the first week.Assuming these data are normally distributed,should this parent reward her child?

Accepted Answer

A) Yes,because the z score for 5 bites is greater than 0. 
B) Yes,because the z score for 5 bites is less than 0. 
C) No,because the z score for 5 bites is greater than 0. 
D) No,because the z score for 5 bites is less than 0. 
A) Yes,because the z score for 5 bites is greater than 0. 
B) Yes,because the z score for 5 bites is less than 0. 
C) No,because the z score for 5 bites is greater than 0. 
D) No,because the z score for 5 bites is less than 0.

Question 18

The mean can take on any value and the standard deviation can take on any positive value.Therefore,

Accepted Answer

A) scores above the mean are distributed the same as scores below the mean 
B) extreme scores are possible in a normal distribution 
C) there are an infinite number of possible normal distributions 
D) this characteristic has no practical implication 
A) scores above the mean are distributed the same as scores below the mean 
B) extreme scores are possible in a normal distribution 
C) there are an infinite number of possible normal distributions 
D) this characteristic has no practical implication

Question 19

Which proportion is largest in a z distribution?

Accepted Answer

A) The proportion of are above the mean. 
B) The proportion of area between z = +1 and z = -1. 
C) The proportion of area greater then z = 1.0. 
D) The proportion of area lea than z = 0. 
A) The proportion of are above the mean. 
B) The proportion of area between z = +1 and z = -1. 
C) The proportion of area greater then z = 1.0. 
D) The proportion of area lea than z = 0.

Question 20

What is the z score for scores in the bottom 10%?

Accepted Answer

A) 1.28 
B) 2.32 
C) -2.32 
D) -1.28 
A) 1.28 
B) 2.32 
C) -2.32 
D) -1.28

The asymptotic tails in a normal distribution represent the possibility of outliers in a data set.

A researcher measures the number of tasks completed by participants during a 5-minute multitasking session.If the number of tasks completed is distributed normally as 6.3 1.0 (M SD)tasks,then what is the probability that participants completed less than 8 tasks?

A researcher records the following response times to a visual stimulus: 23 3.1 (M SD)seconds.Assuming these data are normally distributed,what is the probability that participants responded in 20 seconds or less?

The standard normal distribution is normally distributed with a mean of and a variance of .

A professor records the following final exam scores: 78 7 (M SD).Students scoring in the top 14% get an A.What is the cutoff score for the top 14% in this example?

The z score cutoff for the top 50 percent of scores in any normal distribution is 0.

What is the implication for the tails of a normal distribution being asymptotic?

The binomial probability distribution is distributed with ,and = .

State whether the first area is bigger,the second area is bigger,or the two areas are equal: the area to the left of z = 0.80,or the area to the right of z = -0.80.

Most behavioral phenomena are believed to approximate the normal distribution.

The following distribution most closely approximates a

A researcher finds that the average preschool-aged child drinks two cups of milk per day.Assuming these data are normally distributed,the z score for the average cups per day in this example is

For a set of data with 5±1.5,at least 95% of scores are greater than 3.0.

Which of the following is not a step to locate a proportion in a normal distribution?

Data are normally distributed as 12.5 0.5 (M SD).A score of 13.2 marks the top 33% of scores in this distribution.

All z scores above the mean are positive,whereas all z scores below the mean are negative.

A parent decides to reward her child if he eats an average of at least five bites of his vegetables at dinner during the first week.She finds that her child ate 4 0.8 (M SD)bites per meal for the first week.Assuming these data are normally distributed,should this parent reward her child?

The mean can take on any value and the standard deviation can take on any positive value.Therefore,

Which proportion is largest in a z distribution?

What is the z score for scores in the bottom 10%?

Introduction to Statistics

Summarizing Data: Frequency Distributions in Tables and Graphs

Summarizing Data: Central Tendency

Summarizing Data: Variability

Probability

Probability and Sampling Distributions

Hypothesis Testing: Significance, Effect Size, and Power

Testing Means: One-Sample and Two-Independent Sample T Tests

Testing Means: Related Samples T Test

Estimation and Confidence Intervals

Analysis of Variance: One-Way Between-Subjects Design

Analysis of Variance: One-Way Within-Subjects Repeated Measures Design

Analysis of Variance: Two-Way Between-Subjects Factorial Design

Correlation

Linear Regression and Multiple Regression

Nonparametric Tests: Chi-Square Tests

Nonparametric Tests: Tests for Ordinal Data

Filters

Exam 6: Probability, Normal Distributions, and Z Scores

The asymptotic tails in a normal distribution represent the possibility of outliers in a data set.

A researcher measures the number of tasks completed by participants during a 5-minute multitasking session.If the number of tasks completed is distributed normally as 6.3 1.0 (M SD)tasks,then what is the probability that participants completed less than 8 tasks?

A researcher records the following response times to a visual stimulus: 23 3.1 (M SD)seconds.Assuming these data are normally distributed,what is the probability that participants responded in 20 seconds or less?

The standard normal distribution is normally distributed with a mean of ____ and a variance of ____.

A professor records the following final exam scores: 78 7 (M SD).Students scoring in the top 14% get an A.What is the cutoff score for the top 14% in this example?

The z score cutoff for the top 50 percent of scores in any normal distribution is 0.

What is the implication for the tails of a normal distribution being asymptotic?

The binomial probability distribution is distributed with ,and = .

State whether the first area is bigger,the second area is bigger,or the two areas are equal: the area to the left of z = 0.80,or the area to the right of z = -0.80.

Most behavioral phenomena are believed to approximate the normal distribution.

The following distribution most closely approximates a

A researcher finds that the average preschool-aged child drinks two cups of milk per day.Assuming these data are normally distributed,the z score for the average cups per day in this example is

For a set of data with 5±1.5,at least 95% of scores are greater than 3.0.

Which of the following is not a step to locate a proportion in a normal distribution?

Data are normally distributed as 12.5 0.5 (M SD).A score of 13.2 marks the top 33% of scores in this distribution.

All z scores above the mean are positive,whereas all z scores below the mean are negative.

A parent decides to reward her child if he eats an average of at least five bites of his vegetables at dinner during the first week.She finds that her child ate 4 0.8 (M SD)bites per meal for the first week.Assuming these data are normally distributed,should this parent reward her child?

The mean can take on any value and the standard deviation can take on any positive value.Therefore,

Which proportion is largest in a z distribution?

What is the z score for scores in the bottom 10%?

Introduction to Statistics

Summarizing Data: Frequency Distributions in Tables and Graphs

Summarizing Data: Central Tendency

Summarizing Data: Variability

Probability

Probability and Sampling Distributions

Hypothesis Testing: Significance, Effect Size, and Power

Testing Means: One-Sample and Two-Independent Sample T Tests

Testing Means: Related Samples T Test

Estimation and Confidence Intervals

Analysis of Variance: One-Way Between-Subjects Design

Analysis of Variance: One-Way Within-Subjects Repeated Measures Design

Analysis of Variance: Two-Way Between-Subjects Factorial Design

Correlation

Linear Regression and Multiple Regression

Nonparametric Tests: Chi-Square Tests

Nonparametric Tests: Tests for Ordinal Data

Filters

The standard normal distribution is normally distributed with a mean of and a variance of .