A random sample of 15 telephone calls in an office showed the duration of each call and whether it was a local or a long-distance call.
Duration
Call Number
(In Minutes)
Type of Call
1
2
local
2
12
long distance
3
10
local
4
3
local
5
5
long distance
6
6
local
7
3
local
8
5
local
9
8
local
10
4
local
11
5
local
12
4
local
13
5
local
14
4
local
15
9
long distance
?
a.What is the point estimate for the average duration of all calls?b.What is the point estimate for the standard deviation of the population?c.What is the point estimate for the proportion of all calls that were long distance?
What will be an ideal response?
| a. | 5.67 |
| b. | 2.85 |
| c. | 0.20 |
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