Question 1

Use the seven test scores, 52, 73, 68,74,96,84,92 to answer the following questions:

a) Find the sample mean.

b) Find the median.

c) Which measure of central tendency best describes the typical test

score?

d) Suppose we add 5 points to each test score. Compute the sample mean

based on the adjusted scores.

e) Compare the unadjusted test score mean with the new test score mean

(Part d) . What effect did adding 5 to each score have on the mean?

Question 2

Explain how standard deviation measures spread. In your explanation include the computation of the same standard deviation for two data sets:

Data set : 4, 8, 7, 5

Data set 2, 0, 9, 5