Review Session

Question 1

What does variance represent?

Accepted Answer

How spread out each data value is from the mean.

Question 2

The probability of winning a prize at a ball toss at a carnival is 2/7. What is the probability of not winning a prize?

Accepted Answer

5/7

Question 3

What is the level of measurement for the variable: marital status

Accepted Answer

nominal

Question 4

What does it mean to have a z-score of z=0 on a quiz?

Accepted Answer

It means you scored the same grade as the average grade.

Question 5

Which one of the following variables is not categorical?

Accepted Answer

QPI

Question 6

A list of 5 pulse rates is: 70, 64, 80, 74, 92. What is the median for this list?

Accepted Answer

74

Question 7

What is the level of measurement for the variable: educational level

Accepted Answer

ordinal

Question 8

What is the level of measurement for the variable: clothing size

Accepted Answer

ordinal

Question 9

What is the level of measurement for the variable: average stat score

Accepted Answer

interval

Question 10

Before you can begin calculating the variance, you must first:

Accepted Answer

Find the mean

Question 11

Find the z-score. Mean: 29.8; Standard Deviation: 7; x = 20

Accepted Answer

-1.4

Question 12

Data set: {10, 20, 30, 35, 40} If I add 10 to each data to make a new data set, which stat calculation does not change?

Accepted Answer

range

Question 13

Find the z-score. {10, 8, 10, 8, 8, 4} x = 7

Accepted Answer

-.5

Question 14

How do you calculate the standard deviation?

Accepted Answer

Take the square root of the variance.

Question 15

Which one of these statistics is unaffected by outliers?

Accepted Answer

interquartile range

Questions 15