Question 1

Another name for a binomial variable is a

Accepted Answer

A)  random variable. 
B)  systematic variable. 
C)  participant variable. 
D)  dichotomous variable. 
A)  random variable. 
B)  systematic variable. 
C)  participant variable. 
D)  dichotomous variable.

Question 2

A researcher records the following times (in seconds)that it took a group of mice to complete a maze: 23 ± 4.1 (M ± SD).The top 10% of mice finishing with the fastest times will be placed in a "maze bright" group.What is the cutoff time to be placed in this group?

Accepted Answer

A)  17.75 s 
B)  28.25 s 
C)  faster than 16 s 
D)  There is not enough information to answer this question. 
A)  17.75 s 
B)  28.25 s 
C)  faster than 16 s 
D)  There is not enough information to answer this question.

Question 3

The normal distribution has all of the following characteristics,except that

Accepted Answer

A)  it is symmetrical. 
B)  its distribution is theoretical. 
C)  the total area under the curve is greater than 1.0. 
D)  the mean, median, and mode are equal. 
A)  it is symmetrical. 
B)  its distribution is theoretical. 
C)  the total area under the curve is greater than 1.0. 
D)  the mean, median, and mode are equal.

Question 4

State whether the first area is bigger,the second area is bigger,or the two areas are equal: the area to the right of the mean,or the area between z = ±1.00.

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 5

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 6

In a normal distribution with 3 ± 1 (M ± SD),a researcher can appropriately conclude that about 84.13% of scores were greater than 2.

Accepted Answer

A) True 
 B)False

Question 7

A researcher records the following times (in seconds)that it took a group of students to complete an exam: 18 ± 2 (M ± SD)min.How long did it take 80% of students to complete the exam?

Accepted Answer

A)  less than 16 min 
B)  16.32 min 
C)  less than 18 min 
D)  19.68 min 
A)  less than 16 min 
B)  16.32 min 
C)  less than 18 min 
D)  19.68 min

Question 8

The ______ are the range of continuous values containing the score of interest in a binomial distribution.

Accepted Answer

A)  observed limits 
B)  approximate limits 
C)  real limits 
D)  speed limits 
A)  observed limits 
B)  approximate limits 
C)  real limits 
D)  speed limits

Question 9

A researcher determines that students are active about 60 ± 12 (M ± SD)min/day.Assuming these data are normally distributed,what is the z score for students being active 48 min/week?

Accepted Answer

A)  1.0 
B)  -1.0 
C)  0 
D)  There is not enough information to answer this question. 
A)  1.0 
B)  -1.0 
C)  0 
D)  There is not enough information to answer this question.

Question 10

Two normal distributions are observed.The first distribution has a mean of 12 and a standard deviation of 2.The second distribution has a mean of 0 and a standard deviation of 2.For which distribution will the z score for the mean be larger?

Accepted Answer

A)  the first z distribution 
B)  the second distribution 
C)  none, the z score will be the same 
A)  the first z distribution 
B)  the second distribution 
C)  none, the z score will be the same

Question 11

A researcher records the following time spent sleeping per night (in hours)in a group of participants: 5.8 ± 1.8 (M ± SD).The researcher decides to categorize participants who sleep between 6 and 8 hr as moderate sleepers.What percentage of participants fell in this category?

Accepted Answer

A)  about 39% 
B)  about 11% 
C)  about 35% 
D)  about 7% 
A)  about 39% 
B)  about 11% 
C)  about 35% 
D)  about 7%

Question 12

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

Accepted Answer

A)  locate a z score associated with a given proportion in the unit normal table 
B)  transform a z score into a raw score (x) 
C)  transform a raw score (x) into a z score 
A)  locate a z score associated with a given proportion in the unit normal table 
B)  transform a z score into a raw score (x) 
C)  transform a raw score (x) into a z score

Question 13

What is the z score for scores in the top and bottom 2.5%?

Accepted Answer

A)  ±1.96 
B)  1.96 
C)  .0124 
D)  ±.675 
A)  ±1.96 
B)  1.96 
C)  .0124 
D)  ±.675

Question 14

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 15

In a normal distribution,a score of 8 will always be more probable than a score of 0.

Accepted Answer

A) True 
 B)False

Question 16

When a z score equals 0,this means that there is no variability.

Accepted Answer

A) True 
 B)False

Question 17

The unit normal table can be used to find the probability of a particular score for most,but certainly not all,possible normal distributions.

Accepted Answer

A) True 
 B)False

Question 18

The closer a z score is to 0,the smaller the area is under the normal curve toward the tails.

Accepted Answer

A) True 
 B)False

Question 19

In a normal distribution with 2.2 ± 4.1 (M ± SD),a researcher can appropriately conclude that most scores occurred above the mean.

Accepted Answer

A) True 
 B)False

Question 20

What is the z score for scores in the top 2.5%?

Accepted Answer

A)  .675 
B)  1.96 
C)  .0124 
D)  .0250 
A)  .675 
B)  1.96 
C)  .0124 
D)  .0250

Another name for a binomial variable is a

A researcher records the following times (in seconds)that it took a group of mice to complete a maze: 23 ± 4.1 (M ± SD).The top 10% of mice finishing with the fastest times will be placed in a "maze bright" group.What is the cutoff time to be placed in this group?

The normal distribution has all of the following characteristics,except that

State whether the first area is bigger,the second area is bigger,or the two areas are equal: the area to the right of the mean,or the area between z = ±1.00.

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?

In a normal distribution with 3 ± 1 (M ± SD),a researcher can appropriately conclude that about 84.13% of scores were greater than 2.

A researcher records the following times (in seconds)that it took a group of students to complete an exam: 18 ± 2 (M ± SD)min.How long did it take 80% of students to complete the exam?

The ______ are the range of continuous values containing the score of interest in a binomial distribution.

A researcher determines that students are active about 60 ± 12 (M ± SD)min/day.Assuming these data are normally distributed,what is the z score for students being active 48 min/week?

Two normal distributions are observed.The first distribution has a mean of 12 and a standard deviation of 2.The second distribution has a mean of 0 and a standard deviation of 2.For which distribution will the z score for the mean be larger?

A researcher records the following time spent sleeping per night (in hours)in a group of participants: 5.8 ± 1.8 (M ± SD).The researcher decides to categorize participants who sleep between 6 and 8 hr as moderate sleepers.What percentage of participants fell in this category?

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

What is the z score for scores in the top and bottom 2.5%?

The following distribution most closely approximates a

In a normal distribution,a score of 8 will always be more probable than a score of 0.

When a z score equals 0,this means that there is no variability.

The unit normal table can be used to find the probability of a particular score for most,but certainly not all,possible normal distributions.

The closer a z score is to 0,the smaller the area is under the normal curve toward the tails.

In a normal distribution with 2.2 ± 4.1 (M ± SD),a researcher can appropriately conclude that most scores occurred above the mean.

What is the z score for scores in the top 2.5%?

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: Truehe Related-Samples T Test

Estimation and Confidence Intervals

Analysis of Variance: One-Way Between-Subjects Design

Analysis of Variance: One-Way Within-Subjects Repeated-Measuresdesign

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

Another name for a binomial variable is a

A researcher records the following times (in seconds)that it took a group of mice to complete a maze: 23 ± 4.1 (M ± SD).The top 10% of mice finishing with the fastest times will be placed in a "maze bright" group.What is the cutoff time to be placed in this group?

The normal distribution has all of the following characteristics,except that

State whether the first area is bigger,the second area is bigger,or the two areas are equal: the area to the right of the mean,or the area between z = ±1.00.

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?

In a normal distribution with 3 ± 1 (M ± SD),a researcher can appropriately conclude that about 84.13% of scores were greater than 2.

A researcher records the following times (in seconds)that it took a group of students to complete an exam: 18 ± 2 (M ± SD)min.How long did it take 80% of students to complete the exam?

The ______ are the range of continuous values containing the score of interest in a binomial distribution.

A researcher determines that students are active about 60 ± 12 (M ± SD)min/day.Assuming these data are normally distributed,what is the z score for students being active 48 min/week?

Two normal distributions are observed.The first distribution has a mean of 12 and a standard deviation of 2.The second distribution has a mean of 0 and a standard deviation of 2.For which distribution will the z score for the mean be larger?

A researcher records the following time spent sleeping per night (in hours)in a group of participants: 5.8 ± 1.8 (M ± SD).The researcher decides to categorize participants who sleep between 6 and 8 hr as moderate sleepers.What percentage of participants fell in this category?

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

What is the z score for scores in the top and bottom 2.5%?

The following distribution most closely approximates a

In a normal distribution,a score of 8 will always be more probable than a score of 0.

When a z score equals 0,this means that there is no variability.

The unit normal table can be used to find the probability of a particular score for most,but certainly not all,possible normal distributions.

The closer a z score is to 0,the smaller the area is under the normal curve toward the tails.

In a normal distribution with 2.2 ± 4.1 (M ± SD),a researcher can appropriately conclude that most scores occurred above the mean.

What is the z score for scores in the top 2.5%?

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: Truehe Related-Samples T Test

Estimation and Confidence Intervals

Analysis of Variance: One-Way Between-Subjects Design

Analysis of Variance: One-Way Within-Subjects Repeated-Measuresdesign

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