Question: A sample of 35 workers was randomly selected from a workforce of 110 to estimate the average amount spent weekly at the canteen. The sample

A sample of 35 workers was randomly selected from a workforce of 110 to estimate the average amount spent weekly at the canteen. The sample mean was 5.40 and the sample standard deviation was 2.24:

a. Calculate a 95 per cent confidence interval for the mean.

b. What sample size would be required to estimate the mean to within }0.50 with a 95 per cent confidence interval?

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