Question 1

A ____________________is based on a normal distribution.

Accepted Answer

The answer of A ____________________is based on a normal distribution....

Question 2

Standard scores include the mean and Standard deviation of the distribution.

Accepted Answer

Standard scores, also known as z-scores, are a way to standardize data by transforming it into a standard normal distribution with a mean of 0 and standard deviation of 1. Therefore, standard scores do include the mean and standard deviation of the original distribution.

Question 3

The percentile rank is ____________________.

Accepted Answer

The answer of The percentile rank is ____________________....

Question 4

A distribution in which the mean is 3.00 and the median and mode are 3 is____________________.

Accepted Answer

The answer of A distribution in which the mean is...

Question 5

If your standard score on the exam is -1,you are 1 point below the mean.

Accepted Answer

If your standard score is -1, then you are one standard deviation below the mean, not necessarily one point. The amount of points below the mean will depend on the specific exam and its scale.

Question 6

Scores that are normally distributed will have a mean that is equal to the median and mode.

Accepted Answer

In a normal distribution, the mean, median, and mode will all be equal to each other. This is because the distribution is symmetrical around the mean, and the peak of the curve (mode) will also be at the mean.

Question 7

Percentiles are used in standardized testing such as the SAT.

Accepted Answer

Percentiles are commonly used in standardized testing, including the SAT, to provide a comparison of an individual's score to the scores of other test-takers. Percentiles represent the percentage of scores that fall below a particular score, with higher percentiles indicating better performance.

Question 8

The percentile rank of a score is the same as a percentile.

Accepted Answer

The percentile rank of a score indicates the percentage of scores in a distribution that are equal to or below it, while a percentile is a specific point in a distribution below which a given percentage of scores fall.

Question 9

If Jack's standard score on his math test is .60 and -.75 on his English he did better on his____.

Accepted Answer

The answer of If Jack's standard score on his math...

Question 10

If you wanted to compare the number of hours you sleep with the national average you would have to convert it into____________________.

Accepted Answer

The answer of If you wanted to compare the number...

Question 11

Most empirical data is normally distributed.

Accepted Answer

Most empirical data is not normally distributed. While some datasets may be normally distributed, many real-world datasets exhibit skewed distributions, heavy tails, or other non-normal characteristics.

Question 12

A negative standard score of -1 means you____________________.

Accepted Answer

The answer of A negative standard score of -1 means...

Question 13

Jeff was told that on his GRE is scored in the 85^th percentile which means____________________.

Accepted Answer

The answer of Jeff was told that on his GRE...

Question 14

The median is the same as the____________________.

Accepted Answer

The answer of The median is the same as the____________________....

Question 15

When comparing to scores from different distributions you should convert them into a Standard Distribution.

Accepted Answer

Converting scores into a standard distribution allows for a more accurate comparison between scores from different distributions. By converting scores into Z-scores (based on the mean and standard deviation of the original distribution), they can be compared on a standardized scale.

Question 16

Z-scores are based on the use of the bell shape curve.

Accepted Answer

Z-scores, also known as standard scores, are based on the standard normal distribution, which has a bell shape curve.

Question 17

Professor Hansen wants to eliminate any negative standard scores in his class so he should convert scores into____________________.

Accepted Answer

The answer of Professor Hansen wants to eliminate any negative...

Question 18

Z-scores are based on distributions that are skewed.

Accepted Answer

Z-scores are based on distributions that are assumed to be normal, or bell-shaped. Normal distributions are not skewed.

Question 19

The average family watches 40 hours of TV a week and uses the computer about 80 hours a week.Based on this information we know that the average family spends 50% more time on the computer.

Accepted Answer

The average family spends twice as much time on the computer as they do watching TV, not 50% more.

Question 20

A standard score or Z-score of zero means____________________.

Accepted Answer

The answer of A standard score or Z-score of zero...

Quiz 4: Percentiles,percentile Ranks,standard Scores,and the Normal Distribution