Given two dependent random samples with the following results:

Population 1: 32 35 45 46 43
Population 2: 19 40 31 32 30 47 42

Use this data to find the 90% confidence interval for the true difference between the population means. Assume that both populations are normally distributed.

Step 2 of 4: Calculate the sample standard deviation of the paired differences. Round your answer to six decimal places.