Question 1

A positive z score will convert into a raw score that is below the mean of its distribution.

Accepted Answer

A) True 
 B)False

Question 2

Gerber and Malhotra (2006) found an irregularly high spike in published z scores:

Accepted Answer

A)  just greater than 1.96. 
B)  just less than 1.96. 
C)  around 1.00. 
D)  out as far as 9.16. 
A)  just greater than 1.96. 
B)  just less than 1.96. 
C)  around 1.00. 
D)  out as far as 9.16.

Question 3

A _____ is composed of means based on samples rather than raw scores.

Accepted Answer

A)  distribution of means 
B)  distribution of z scores 
C)  standardized distribution 
D)  percentile distribution 
A)  distribution of means 
B)  distribution of z scores 
C)  standardized distribution 
D)  percentile distribution

Question 4

Approximately _____ percent of scores fall between the mean and a z score of 2.

Accepted Answer

A)  32 
B)  34 
C)  48 
D)  50 
A)  32 
B)  34 
C)  48 
D)  50

Question 5

The _____ is a distribution composed of many sample means.

Accepted Answer

A)  standard normal curve 
B)  central limit theorem 
C)  standard error 
D)  distribution of means 
A)  standard normal curve 
B)  central limit theorem 
C)  standard error 
D)  distribution of means

Question 6

The first step in calculating a z score is calculating:

Accepted Answer

A)  a standard deviation score. 
B)  the raw scores and subtracting from the mean of the sample. 
C)  the difference between a particular score and the population mean. 
D)  the difference between a particular score and the sample mean. 
A)  a standard deviation score. 
B)  the raw scores and subtracting from the mean of the sample. 
C)  the difference between a particular score and the population mean. 
D)  the difference between a particular score and the sample mean.

Question 7

Researchers used their knowledge of the z distribution to assert that some published data might have been "cleaned" or altered in some way in order for test statistics to pass a cutoff at z of 1.96.That cutoff corresponds to observations that happen less than _____ percent of the time.

Accepted Answer

A)  1 
B)  2.5 
C)  5 
D)  10 
A)  1 
B)  2.5 
C)  5 
D)  10

Question 8

A z score of -1.0 represents _____ a z score of -3.0.

Accepted Answer

A)  the same score as 
B)  a lower score than 
C)  a higher score than 
D)  a more standard score than 
A)  the same score as 
B)  a lower score than 
C)  a higher score than 
D)  a more standard score than

Question 9

Approximately _____ percent of scores fall between the mean and a z score of -1.

Accepted Answer

A)  32 
B)  34 
C)  48 
D)  50 
A)  32 
B)  34 
C)  48 
D)  50

Question 10

A distribution has a mean of 600 with a standard deviation of 50.A z score of 2.04 converts into a raw score of:

Accepted Answer

A)  12.04. 
B)  24.48. 
C)  652.04. 
D)  702.00. 
A)  12.04. 
B)  24.48. 
C)  652.04. 
D)  702.00.

Question 11

The distribution of means is less variable than the distribution of scores.

Accepted Answer

A) True 
 B)False

Question 12

The z distribution _____ has a mean of _____.

Accepted Answer

A)  always; 0 
B)  sometimes; 0 
C)  always; 1 
D)  sometimes; 1 
A)  always; 0 
B)  sometimes; 0 
C)  always; 1 
D)  sometimes; 1

Question 13

Daniel wanted to know his approximate score on the final exam for his mathematics class.His professor hinted that his score was well above the class average.The professor announced that the mean for the class final exam was 88 with a standard deviation of 7.Given Daniel's z score of 1.67, what is the raw score for his exam grade?

Accepted Answer

A)  100.00 
B)  99.69 
C)  102.45 
D)  88.17 
A)  100.00 
B)  99.69 
C)  102.45 
D)  88.17

Question 14

Because a z score is the number of standard deviations a score is from its mean, the first step in converting a z score back to a raw score is multiplying z and the standard deviation.

Accepted Answer

A) True 
 B)False

Question 15

The first step in converting a z score into a raw score is multiplying the z score by the:

Accepted Answer

A)  population standard less the population mean. 
B)  the raw score. 
C)  population standard deviation. 
D)  population mean. 
A)  population standard less the population mean. 
B)  the raw score. 
C)  population standard deviation. 
D)  population mean.

Question 16

According to _____, as sample size increases, the distribution of _____ assumes a normal curve.

Accepted Answer

A)  the standardized distribution; sample scores 
B)  the central limit theorem; sample means 
C)  the z-score distribution; population scores 
D)  hypothesis testing; raw scores 
A)  the standardized distribution; sample scores 
B)  the central limit theorem; sample means 
C)  the z-score distribution; population scores 
D)  hypothesis testing; raw scores

Question 17

Standard scores represent the number of standard deviations a particular score is from the median.

Accepted Answer

A) True 
 B)False

Question 18

As sample size _____, the mean of a distribution of means _____.

Accepted Answer

A)  increases; increases 
B)  increases; stays the same 
C)  increases; decreases 
D)  decreases; increases 
A)  increases; increases 
B)  increases; stays the same 
C)  increases; decreases 
D)  decreases; increases

Question 19

When attempting to create a distribution of means, we sample with replacement; that is, we do not put data back in the sample after we have computed the mean of those data.

Accepted Answer

A) True 
 B)False

Question 20

Little John, at the age of 7, is one of the tallest kids in his class, while his older brother Matthew, at the age of 12, is one of the shortest kids in his class.Which statement would be true if their heights were converted to z scores?

Accepted Answer

A)  John's positive z score would exceed Matthew's z score, indicating that he is taller. 
B)  Matthew's z score for his age group would be less than John's in his respective distribution. 
C)  Matthew would have a negative z score and John would have a positive z score. 
D)  John's z score would be twice the magnitude of Matthew's z score. 
A)  John's positive z score would exceed Matthew's z score, indicating that he is taller. 
B)  Matthew's z score for his age group would be less than John's in his respective distribution. 
C)  Matthew would have a negative z score and John would have a positive z score. 
D)  John's z score would be twice the magnitude of Matthew's z score.

A positive z score will convert into a raw score that is below the mean of its distribution.

Gerber and Malhotra (2006) found an irregularly high spike in published z scores:

A _____ is composed of means based on samples rather than raw scores.

Approximately _____ percent of scores fall between the mean and a z score of 2.

The _____ is a distribution composed of many sample means.

The first step in calculating a z score is calculating:

Researchers used their knowledge of the z distribution to assert that some published data might have been "cleaned" or altered in some way in order for test statistics to pass a cutoff at z of 1.96.That cutoff corresponds to observations that happen less than _____ percent of the time.

A z score of -1.0 represents _____ a z score of -3.0.

Approximately _____ percent of scores fall between the mean and a z score of -1.

A distribution has a mean of 600 with a standard deviation of 50.A z score of 2.04 converts into a raw score of:

The distribution of means is less variable than the distribution of scores.

The z distribution _ has a mean of _.

Because a z score is the number of standard deviations a score is from its mean, the first step in converting a z score back to a raw score is multiplying z and the standard deviation.

The first step in converting a z score into a raw score is multiplying the z score by the:

According to _, as sample size increases, the distribution of _ assumes a normal curve.

Standard scores represent the number of standard deviations a particular score is from the median.

As sample size _, the mean of a distribution of means _.

When attempting to create a distribution of means, we sample with replacement; that is, we do not put data back in the sample after we have computed the mean of those data.

Little John, at the age of 7, is one of the tallest kids in his class, while his older brother Matthew, at the age of 12, is one of the shortest kids in his class.Which statement would be true if their heights were converted to z scores?

An Introduction to Statistics and Research Design

Frequency Distributions

Visual Displays of Data

Central Tendency and Variability

Sampling and Probability

Hypothesis Testing With Z Tests

Confidence Intervals, Effect Size, and Statistical Power

The Single-Sample T Test

The Paired-Samples T Test

The Independent-Samples T Test

One-Way Between-Groups Anova

One-Way Within-Groups Anova

Two-Way Between-Groups Anova

Correlation

Regression

Chi-Square Tess

Choosing and Reporting Statistics

Filters

Exam 6: The Normal Curve, Standardization and Z Scores

A positive z score will convert into a raw score that is below the mean of its distribution.

Gerber and Malhotra (2006) found an irregularly high spike in published z scores:

A _____ is composed of means based on samples rather than raw scores.

Approximately _____ percent of scores fall between the mean and a z score of 2.

The _____ is a distribution composed of many sample means.

The first step in calculating a z score is calculating:

Researchers used their knowledge of the z distribution to assert that some published data might have been "cleaned" or altered in some way in order for test statistics to pass a cutoff at z of 1.96.That cutoff corresponds to observations that happen less than _____ percent of the time.

A z score of -1.0 represents _____ a z score of -3.0.

Approximately _____ percent of scores fall between the mean and a z score of -1.

A distribution has a mean of 600 with a standard deviation of 50.A z score of 2.04 converts into a raw score of:

The distribution of means is less variable than the distribution of scores.

The z distribution _____ has a mean of _____.

Because a z score is the number of standard deviations a score is from its mean, the first step in converting a z score back to a raw score is multiplying z and the standard deviation.

The first step in converting a z score into a raw score is multiplying the z score by the:

According to _____, as sample size increases, the distribution of _____ assumes a normal curve.

Standard scores represent the number of standard deviations a particular score is from the median.

As sample size _____, the mean of a distribution of means _____.

When attempting to create a distribution of means, we sample with replacement; that is, we do not put data back in the sample after we have computed the mean of those data.

Little John, at the age of 7, is one of the tallest kids in his class, while his older brother Matthew, at the age of 12, is one of the shortest kids in his class.Which statement would be true if their heights were converted to z scores?

An Introduction to Statistics and Research Design

Frequency Distributions

Visual Displays of Data

Central Tendency and Variability

Sampling and Probability

Hypothesis Testing With Z Tests

Confidence Intervals, Effect Size, and Statistical Power

The Single-Sample T Test

The Paired-Samples T Test

The Independent-Samples T Test

One-Way Between-Groups Anova

One-Way Within-Groups Anova

Two-Way Between-Groups Anova

Correlation

Regression

Chi-Square Tess

Choosing and Reporting Statistics

Filters

The z distribution _ has a mean of _.

According to _, as sample size increases, the distribution of _ assumes a normal curve.

As sample size _, the mean of a distribution of means _.