Very Brief Stats Midterm Review

Find the z-score of the value of 21.3 from a normally distributed set of data that has a mean of 19 and a standard deviation of 2.4.

• 13.4

• 0.96

• -0.96

• 2.4

A basketball player averages 33 points a game with a standard deviation of 5 points. Assuming the

data is normally distributed, approximately what percentage of games does the player score below 28 points?

• 32%

• 13.5%

• 16%

• 84%

Which of the following is an example of a quantitative variable?

• color of a car

• zip code

• taxes paid

• political preference

Which of the following is an example of a categorical variable?

• social security number

• weight

• height

• salary

The data photoed here can be described how?

• skewed left

• skewed right

• symmetrical

• bimodal

The correlation coefficient of -0.25 suggests which of the following?

• 1. A strong positive correlation

• A weak negative correlation

• A 25% chance of an event happening

• A strong negative correlation

The predicting equation is y = -3.5 + 2.70x. What is the residual for point (4, 7)?

• 0.3

• -0.3

• 7.3

• 14.3

What variable causes an independent and dependent variable to appear to be correlated?

• Confounding

• Response

• Explanatory

• Lurking

What tools are used for blinding in an experiment?

• parameters

• placebos

• clusters

• confounding variables

I randomly choose 10 freshmen, 10 sophomores, 10 juniors, and 10 seniors. What type of sampling method did I use?

• cluster

• convenience

• SRS

• stratified