AP Stats Standardizing & Transforming Data

Question 1

Which is true about a z-score of 0?

Accepted Answer

The observed value is equal to the mean

Question 2

A test has a std dev of 100. We add 50 points to each score, what happens to the std dev?

Accepted Answer

The std dev wouldn't change.

Question 3

Which will be affected by multiplying (or dividing) a data set by a constant?

Accepted Answer

Spread, Position

Question 4

Tells how many standard deviations a value is from the mean.

Accepted Answer

z-score

Question 5

How would adding 50 points to each score on a test affect the shape of the distribution?

Accepted Answer

The shape wouldn't change.

Question 6

Which is (are) a measure of position?

Accepted Answer

Maximum, Mean

Question 7

Which is (are) a measure of spread?

Accepted Answer

Standard deviation, IQR

Question 8

Which is the formula for the standardized test statistic?

Accepted Answer

(statistic-parameter)/SE of statistic, (x-\overline{x})\divσ, \left(p-p-hat\right)\divσ, (observed-expected) / SD

Question 9

Suppose we multiply an entire data set by 100. Which measure will NOT change?

Accepted Answer

z-score

Question 10

Which is the correct interpretation of z = 2.5?

Accepted Answer

the value is 2.5 standard deviations above the mean

Question 11

Which will be affected by adding (or subtracting) a constant to a data set?

Accepted Answer

Position

Question 12

Which z-score is more unusual?

Accepted Answer

z = 2.5

Question 13

A test has a mean of 450. How would adding 50 points to each score affect the mean?

Accepted Answer

The mean would increase by 50 to 500.

Question 14

The process of subtracting the mean and then dividing by the standard deviation.

Accepted Answer

Standardizing, z-score

Question 15

Which is NOT a parameter?

Accepted Answer

Σ

Questions 15