Question
1.Taking a random sample of 35 individuals waiting to be serviced by the teller, we find that the mean waiting time was 22.0 minutes and
1.Taking a random sample of 35 individuals waiting to be serviced by the teller, we find that the mean waiting time was 22.0 minutes and the standard deviation was 8.0 minutes. Construct a 97% confidence interval of the mean waiting time for all individuals waiting in the service line. If an individual waited for 15 minutes, would this be considered unusually fast?
2.Travelers pay taxes for flying, car rentals and hotels. The following data represent the total travel tax (in RM) for a 3-day business trip in eight randomly selected cities.
67.81
78.69
68.99
84.36
80.24
86.14
101.27
99.29
a.Determine a point estimate for the population mean travel tax.
b.Determine a point estimate for the population variance travel tax.
c.Construct and interpret a 99% confidence interval to estimate the mean tax paid for a 3-day business trip.
d.What would you recommend to a researcher who wants to increase the precision of the interval, but does not have access to additional data?
3.A study on Telco monthly usage (RM unit) has been done among students of Applied Statistics course.
a.Select 20 data from the following data at random using EXCEL. Write the whole process of the selection.
b.Construct and interpret a 95% confidence interval to estimate the mean Telco monthly usage.
Monthly bill or topup (RM)
30
50
100
100
45
30
30
30
50
30
30
50
40
30
60
40
90
40
98
45
50
90
28
30
30
50
10
20
40
35
72
42
50
35
50
60
50
30
80
35
30
130
40
59
50
42
55
30
200
40
60
100
50
30
35
40
30
150
60
50
80
120
20
50
40
45
30
35
40
30
59
42
30
98
40
30
30
30
50
35
50
50
30
60
48
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