and to test this, a random sample is selected from each of the factories. The British sample consists of 20 workers who

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and to test this, a random sample is selected from each of the factories.
The British sample consists of 20 workers who takes an average of 25 minutes to complete a standard task. Their standard deviation is five minutes. The German sample has 15 workers who take an average of 20 minutes to complete the same task, and the sample has a standard deviation of four minutes. Use an appropriate hypothesis test, at the one percent level of significance to find if the German workers are more efficient
(b) The National Stadium Karachi is considering expanding its seating capacity and needs to know both the average number of people who attend events there
and the variability in this number. The following are the attendances (in thousands) at nine randomly selected sporting events.
8.8 14.0 21.3 7.9 12.5 20.6 16.3 14.1 13.0
Construct a 95% confidence interval for the population mean.