Question 1:

Assume that you want to test the claim that the paired sample data come from a population for which the mean difference is = 0. Compute the value of the t test statistic.

x 7 2 7 3 10

y 4 4 3 4 5

Use three decimal places.

This is what I did:

Mean = 1.8

Standard Deviation = 4.069

Sqrt of n (5) = 2.236

By using the Studen t distribution I calculated the following:

t = mean of the difference - 0/sd/sqrt of n

t = 1.8-0/4.069/2.236 = 1.8/1.8197 = 0.989

This answer is incorrect. What am I missing?