The assistant to the regional manager of a mid-size paper company wants to know if his subordinates waste time on their personal email accounts instead of using their work email. To address the question, he has his cousin who works on his beet farm collect data on each of the 20 employees. The data below shows the average number of emails each employee (subordinate) sends in a week for both personal and work email accounts.

Employee	Personal	Work	Difference
1	19	21	-2
2	16	20	-4
3	17	20	-3
4	14	21	-7
5	17	26	-9
6	16	25	-9
7	19	17	2
8	18	23	-5
9	15	23	-8
10	18	24	-6
11	15	25	-10
12	16	17	-1
13	16	25	-9
14	14	24	-10
15	13	26	-13
16	17	23	-6
17	19	23	-4
18	17	23	-6
19	14	23	-9
20	13	22	-9
Average	16.15	22.55	-6.4
St. Dev.	1.93	2.58	3.63

The assistant to the regional manager can sometimes be confusing in what he wants, so the explicit research question is given below.

Research question: Do employees send more emails on average using their personal email than their work email?

1. Calculate a 95% confidence interval for the parameter of interest (2 pts)

2. Interpret the confidence interval. (2pts)

3. Provide an answer to the assistant to the regional manager's research question based on the confidence interval you found in question 26. (2 pts)