Question 1

The _____ of a set of standard scores is always equal to 0.

Accepted Answer

D

Question 2

The score value corresponding to a given percentile rank is referred to as a(n)_____.

Accepted Answer

The score value corresponding to a given percentile rank is referred to as a percentile. This is because percentiles rank an individual's performance among a group of people, and provide information about the percentage of the group who scored below that individual. A standard score is a type of normalized score that expresses an individual's performance in standard deviation units from the mean. The median value is the middle score in a distribution, while the optimal value is a value that is deemed desirable or the best in a given context, which may vary depending on the situation. None of these terms refer specifically to a score value corresponding to a given percentile rank.

Question 3

A survey finds that 50% of college students spend 10 hours or less on homework weekly.The percentile rank of _____ is _____.

Accepted Answer

The percentile rank of a value is the percentage of data points below that value. Since 50% of students spend 10 hours or less, the percentile rank of 10 hours is 50.

Question 4

In all normal distributions,the mean,the median,and the mode are all:

Accepted Answer

In all normal distributions, the mean, median, and mode are all equal to each other. This is because the normal distribution is symmetrical around the mean, so the peak of the distribution (mode), the midpoint of the distribution (median), and the average of all the values (mean) are all the same.

Question 5

A _____ standard score indicates that the original score is _____ than the mean.

Accepted Answer

A positive standard score indicates the original score is greater than the mean, while a negative standard score indicates it is less than the mean.

Question 6

The score value corresponding to a given percentile rank is referred to as a _____.

Accepted Answer

The score value corresponding to a given percentile rank is referred to as a percentile. A z-score is a measure of how many standard deviations a data point is from the mean, while a percentage is a proportion out of 100. None of these options accurately describe the score value corresponding to a percentile rank.

Question 7

All normal distributions are:

Accepted Answer

Normal distributions are characterized by a "bell shape" with a symmetrical distribution around the mean. They are not positively or negatively skewed, and option A is incorrect as it states that normal distributions are asymmetrical around the mean, which is not true.

Question 8

A percentile rank reflects a(n)_____ measure of relative standing.

Accepted Answer

A percentile rank divides a distribution of scores into 100 equal parts and gives the position of a score relative to these parts. This position is a relative ranking and does not have a true zero point. Therefore, the best choice is ordinal as it reflects the order or ranking of scores.

Question 9

The _____ and the _____ of a set of standard scores is always equal to 1.00.

Accepted Answer

The answer of The _____ and the _____ of a...

Question 10

A standard score represents the number of _____ that a score falls above or below the mean.

Accepted Answer

A standard score, also known as z-score, is a measure of how many standard deviation units a score falls above or below the mean. Therefore, the correct choice is C, standard deviation units.

Question 11

All normal distributions are _____ in nature.

Accepted Answer

Normal distributions are theoretical in nature, meaning they are mathematical models rather than actual observed data. Normal distributions are symmetrical and have a mesokurtic shape, which means they have moderate or average levels of peakness. They are not categorically leptokurtic, which means they are not overly peaked or narrow, nor are they platykurtic, which means they are not overly flat or dispersed.

Question 12

A standard score converts a score from its original,or raw form to a form that takes into consideration its standing relative to the _____ and _____ of the entire distribution of scores.

Accepted Answer

A standard score takes into consideration the mean and standard deviation of the entire distribution of scores to provide a measure of a score's standing relative to the rest of the scores. Percentiles and percentile ranks only consider the relative standing of a score within a specific percentage of the distribution.

Question 13

The median corresponds to the _____ percentile.

Accepted Answer

The median is the value that divides the data set exactly in half, meaning that 50% of the data is below the median and 50% is above it. Therefore, the median corresponds to the 50th percentile.

Question 14

In a frequency distribution,the term designating the score corresponding to the 50th percentile is known as the _____.

Accepted Answer

The score corresponding to the 50th percentile is known as the median. This means that half of the scores are above the median and half are below it. The mean represents the average of all scores, while the mode represents the most frequently occurring score. The standard deviation is a measure of how spread out the scores are from the mean.

Question 15

One important use of standard scores is to compare scores on distributions that have different _____ and _____.

Accepted Answer

Standard scores are also known as z-scores, which are calculated by subtracting the mean of a distribution from a score and dividing the result by the standard deviation. This standardization process allows for the comparison of scores from distributions that have different means and standard deviations. Therefore, the correct answer is C, which mentions means and standard deviations as the two important parameters to compare scores on different distributions.

Question 16

A survey finds that 80% of high school students scored at least 75 on a given intelligence test.The 80th _____ is _____.

Accepted Answer

The 80th percentile is the value below which 80% of the observations fall, which in this case is a score of 75.

Question 17

The percentage of scores in the distribution that occur at or below a given value,X,is the _____ of that value.

Accepted Answer

The percentage of scores in the distribution that occur at or below a given value is the percentile rank of that value. Percentiles represent the relative standing of a score within a distribution, indicating the percentage of scores that fall at or below a particular value. A percentile rank of 50, for example, indicates that the score falls at the median of the distribution (i.e., 50% of the scores are at or below that value).

Question 18

The number of standard deviation units that a score falls above or below the mean is represented by the _____.

Accepted Answer

The standard score, also called z-score, is a measure of how far a score is from the mean in units of standard deviation. It allows for the comparison of scores from different distributions and helps to identify outliers or extreme scores. The other options are not directly related to the calculation of standard deviation units.

Question 19

A standard score of _____ indicates that the original score is equal to the mean.

Accepted Answer

A standard score of 0 indicates that the original score is equal to the mean.

Question 20

The percentage of scores in a distribution that occur at or below a given value is the _____ of that value.

Accepted Answer

The percentage of scores in a distribution that occur at or below a given value is the percentile rank of that value.

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

The _____ of a set of standard scores is always equal to 0.

The score value corresponding to a given percentile rank is referred to as a(n) _____.

A survey finds that 50% of college students spend 10 hours or less on homework weekly.The percentile rank of _ is _.

In all normal distributions,the mean,the median,and the mode are all:

A _ standard score indicates that the original score is _ than the mean.

The score value corresponding to a given percentile rank is referred to as a _____.

All normal distributions are:

A percentile rank reflects a(n) _____ measure of relative standing.

The _ and the _ of a set of standard scores is always equal to 1.00.