Question 1

Which of the following is an appropriate step for the normal approximation of the binomial distribution?

Accepted Answer

A)  check for normality 
B)  find the real limits 
C)  find the proportion located within the real limits 
D)  all of these 
A)  check for normality 
B)  find the real limits 
C)  find the proportion located within the real limits 
D)  all of these

Question 2

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 = 1.00,or the area to the left of 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 3

Data were normally distributed as 3.6 ± 0.6 (M ± SD).Hence,69.15% of data occurred below a score of 3.9 in this distribution.

Accepted Answer

A) True 
 B)False

Question 4

A z score for the mean in a normal distribution is always equal to 0.

Accepted Answer

A) True 
 B)False

Question 5

The first step to locating proportions in a normal distribution is to first look up probabilities in the unit normal table.

Accepted Answer

A) True 
 B)False

Question 6

A researcher wants to know the probability of selecting a student athlete from a school population where 5% of students are athletes.If the researcher selects a sample of 120 students,is it appropriate to use the normal approximation of the binomial distribution to estimate this probability?

Accepted Answer

A)  Yes, because the sample size is large. 
B)  Yes, because nq is greater than 10. 
C)  No, because np is greater than 10. 
D)  No, because np is less than 10. 
A)  Yes, because the sample size is large. 
B)  Yes, because nq is greater than 10. 
C)  No, because np is greater than 10. 
D)  No, because np is less than 10.

Question 7

It is appropriate to use the normal approximation of the binomial distribution with a sample of 100 participants,where p = .07 and q = .93.

Accepted Answer

A) True 
 B)False

Question 8

A researcher determines that students study an average of 80 ± 20 (M ± SD)min/week.Assuming these data are normally distributed,what is the z score for students studying 60 min/week?

Accepted Answer

A)  1.0 
B)  -1.0 
C)  .3413 
D)  .1587 
A)  1.0 
B)  -1.0 
C)  .3413 
D)  .1587

Question 9

A theoretical distribution that evenly distributes data around the mean,median,and mode is called the

Accepted Answer

A)  normal distribution. 
B)  bell-shaped distribution. 
C)  Gaussian distribution. 
D)  all of these. 
A)  normal distribution. 
B)  bell-shaped distribution. 
C)  Gaussian distribution. 
D)  all of these.

Question 10

The unit normal table can be used to find the probability of a particular score in both normal and nonnormal distributions.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following proportions is largest in a z distribution?

Accepted Answer

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

Question 12

Most behavior is believed to ______ a normal distribution.

Accepted Answer

A)  be exactly equal to 
B)  not resemble at all 
C)  approximate 
A)  be exactly equal to 
B)  not resemble at all 
C)  approximate

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

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

Question 15

The total area under a normal curve increases as the standard deviation increases.

Accepted Answer

A) True 
 B)False

Question 16

A professor finds that the students scored a 76 ± 8 (M ± SD)on the final exam.On this exam,a score of 90 is an A. Assuming these data are normally distributed, what is the z score for 90 (the cutoff for an A)?

Accepted Answer

A)  1.75 
B)  1.50 
C)  1.25 
D)  There is not enough information to answer this question. 
A)  1.75 
B)  1.50 
C)  1.25 
D)  There is not enough information to answer this question.

Question 17

A researcher selected data that were normally distributed and appropriately concluded that about 68.26% of scores occurred within one standard deviation of the mean.

Accepted Answer

A) True 
 B)False

Question 18

A standard normal distribution is a specific example of one of the infinitely possible normal distributions that could exist.

Accepted Answer

A) True 
 B)False

Question 19

The unit of measurement distributed along the x-axis of a standard normal distribution is referred to as a

Accepted Answer

A)  standardized score. 
B)  x score. 
C)  normalized deviation. 
D)  z score. 
A)  standardized score. 
B)  x score. 
C)  normalized deviation. 
D)  z score.

Question 20

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

Which of the following is an appropriate step for the normal approximation of the binomial distribution?

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 = 1.00,or the area to the left of z = -1.00.

Data were normally distributed as 3.6 ± 0.6 (M ± SD).Hence,69.15% of data occurred below a score of 3.9 in this distribution.

A z score for the mean in a normal distribution is always equal to 0.

The first step to locating proportions in a normal distribution is to first look up probabilities in the unit normal table.

A researcher wants to know the probability of selecting a student athlete from a school population where 5% of students are athletes.If the researcher selects a sample of 120 students,is it appropriate to use the normal approximation of the binomial distribution to estimate this probability?

It is appropriate to use the normal approximation of the binomial distribution with a sample of 100 participants,where p = .07 and q = .93.

A researcher determines that students study an average of 80 ± 20 (M ± SD)min/week.Assuming these data are normally distributed,what is the z score for students studying 60 min/week?

A theoretical distribution that evenly distributes data around the mean,median,and mode is called the

The unit normal table can be used to find the probability of a particular score in both normal and nonnormal distributions.

Which of the following proportions is largest in a z distribution?

Most behavior is believed to ______ a normal distribution.

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

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

The total area under a normal curve increases as the standard deviation increases.

A professor finds that the students scored a 76 ± 8 (M ± SD)on the final exam.On this exam,a score of 90 is an A. Assuming these data are normally distributed, what is the z score for 90 (the cutoff for an A)?

A researcher selected data that were normally distributed and appropriately concluded that about 68.26% of scores occurred within one standard deviation of the mean.

A standard normal distribution is a specific example of one of the infinitely possible normal distributions that could exist.

The unit of measurement distributed along the x-axis of a standard normal distribution is referred to as a

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

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

Which of the following is an appropriate step for the normal approximation of the binomial distribution?

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 = 1.00,or the area to the left of z = -1.00.

Data were normally distributed as 3.6 ± 0.6 (M ± SD).Hence,69.15% of data occurred below a score of 3.9 in this distribution.

A z score for the mean in a normal distribution is always equal to 0.

The first step to locating proportions in a normal distribution is to first look up probabilities in the unit normal table.

A researcher wants to know the probability of selecting a student athlete from a school population where 5% of students are athletes.If the researcher selects a sample of 120 students,is it appropriate to use the normal approximation of the binomial distribution to estimate this probability?

It is appropriate to use the normal approximation of the binomial distribution with a sample of 100 participants,where p = .07 and q = .93.

A researcher determines that students study an average of 80 ± 20 (M ± SD)min/week.Assuming these data are normally distributed,what is the z score for students studying 60 min/week?

A theoretical distribution that evenly distributes data around the mean,median,and mode is called the

The unit normal table can be used to find the probability of a particular score in both normal and nonnormal distributions.

Which of the following proportions is largest in a z distribution?

Most behavior is believed to ______ a normal distribution.

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

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

The total area under a normal curve increases as the standard deviation increases.

A professor finds that the students scored a 76 ± 8 (M ± SD)on the final exam.On this exam,a score of 90 is an A. Assuming these data are normally distributed, what is the z score for 90 (the cutoff for an A)?

A researcher selected data that were normally distributed and appropriately concluded that about 68.26% of scores occurred within one standard deviation of the mean.

A standard normal distribution is a specific example of one of the infinitely possible normal distributions that could exist.

The unit of measurement distributed along the x-axis of a standard normal distribution is referred to as a

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

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