A random sample of 28 statistics tutorials was selected from the past 5 years and the percentage of students absent from each one recorded. The results are given below. Assume the percentages of students' absences are approximately normally distributed. Use Excel to estimate the mean percentage of absences per tutorial over the past 5 years with 90% confidence. Round your answers to two decimal places and use increasing order. Number of Absences Number of Absences 13.9 16.4 12.3 13.2 8.4 4.4 10.3 8.8 4.8 10.9 15.9 9.7 4.5 11.5 5.7 10.8 9.7 8.2 10.3 12.2 10.6 16.2 15.2 1.7 11.7 11.9 10.0 12.4
A random sample of 28 statistics tutorials was selected from the past 5 years and the percentage of students absent from each one recorded. The results are given below. Assume the percentages of students' absences are approximately
Number of Absences
Number of Absences
13.9
16.4
12.3
13.2
8.4
4.4
10.3
8.8
4.8
10.9
15.9
9.7
4.5
11.5
5.7
10.8
9.7
8.2
10.3
12.2
10.6
16.2
15.2
1.7
11.7
11.9
10.0
12.4
Given population is Normally distributed.
As we do not know the population standard deviation, to find the confidence interval for population mean, we use t test statistic
level of significance = 0.10
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