Question
A manager claims that the average sales for her shop is RM 1800 per day during school holiday. The sample mean of the sales for
A manager claims that the average sales for her shop is RM 1800 per day during school holiday. The sample mean of the sales for first 10 days and last 10 days is RM 1880 and RM 1790, respectively with standard deviation of RM 14 and RM 13. Assume that both population
variances are equal.
i) Find a 90% confidence interval of the difference mean sales between the first and last 10 days of the school holiday period. Interpret the value.
[7 Marks]
ii) If the level of confidence changed to 95%, which percentage of confidence level has a greater range? Explain why.[3 Marks]
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