- show all formulas and all work - all work is by hand (may use a calculator) and show two decimal places for answers that require calculations (10 total points)

1. The value of one score in a distribution is changed from X = 20 to X = 30. Which measure(s) of central tendency is (are) certain to be changed? (1 point)

(a) the median

(b) the mean

(c) both the median and the mean

(d) the mode

2. A sample consists of n = 16 scores. How many of the scores are used to calculate the range? (1 point)

(a) 2

(b) 4

(c) 8

(d) 16

3. In a population with a m = 50, a score of X = 45 would have a deviation score of ____________. (1 point)

(a) +5

(b) -5

(c) 45

(d) cannot be determined

4. A sample of n = 5 scores has a = 20 and a S² = 4. What is the sample standard deviation? (1 point)

5. What is the sum of squares for the following set of data? Scores: 1, 3, 5(1 point)

6. Below are a set of data from a drug study showing the vehicle (placebo) data for a test day. (5 points)

Mouse VEH Test Day

DRL 1 1.5

DRL 3 1.5

DRL 4 3

DRL 5 1

DRL 12 2.5

DRL 8 0.5

DRL 9 0.5

DRL 10 4.5

DRL 11 1.5

(a) Calculate the mean, median and mode

(b) Calculate the range, variance and standard deviation