A podiatrist recorded the recovery time, in days, for 38 patients. He was trying out a new procedure and hoped the result would be less recovery time on average. The mean recovery using the previous procedure was 6.5 days. The recorded times were:
|
8
|
7
|
8
|
6
|
9
|
4
|
5
|
3
|
7
|
8
|
10
|
7
|
7
|
6
|
4
|
10
|
3
|
6
|
8
|
|
2
|
5
|
5
|
4
|
5
|
3
|
8
|
7
|
4
|
6
|
3
|
7
|
12
|
4
|
3
|
6
|
6
|
9
|
4
|
Note that Σx = 229 and Σx2 = 1581.
(a) What is a point estimate for the population mean µ?
(b) Find a 90% confidence interval for µ.
(c) What is the maximum error of estimate for µ?