An experimental diet to induce weight loss was followed for one week by a randomly selected group of 12 students with the following results.

Student	Loss in Pounds
1	2.2
2	2.6
3	0.4
4	2.0
5	0.0
6	1.8
7	5.2
8	3.8
9	4.2
10	3.8
11	1.4
12	2.6

a.	Find a point estimate for the average and the standard deviation for the amount lost after one week on this diet.
b.	Construct a 90% confidence interval for the population mean amount of weight lost for one week on this diet.