Chapter 2

Question 1

Percentile

Answer 1

the percent of values in a distribution that are less than the chosen individual’s data value

Ruhi’s ACT is 99th percentile, so it’s greater than 99% of the others.

Question 2

Relative Frequency

Answer 2

proportion or percentage of data that occurs in a certain category

39% of skiers are part of an environmental group or something

Question 3

Cumulative Relative Frequency

Answer 3

Proportion or percentage of data that are less than or equal to a certain value

Similar to percentile

Question 4

Cumulative Relative Frequency Graph

Answer 4

Line graph for the cumulative relative frequencies of different values

Graphs Cumulative Relative Frequency Graph

Question 5

Standardized Score (Z-Score)

Answer 5

the number of standard deviations a given data point lies above or below the mean
~~~
Z = (X - M)/(N)
~~~

Question 6

Empirical Rule

Answer 6

~68% of observations fall within 1 SD of the mean
~95% of observations fall within 2 SD of the mean
~99.7% of observations fall within 3 SD of the mean

The rule is pretty important

Question 7

Standard Normal Distribution

Answer 7

Normal Distribution with mean = 0 & SD = 1