## Question 984:

a sample of 35 workers was randomly selected from a workforce of 110 to estimate the average amount spent weekly at a canteen by each worker.the sample meam was $13 and the sample standard deviation was $3.25.(i) calculate a 95% confidence interval for the mean. (ii) the canteen owner argues that the average amount spent by each worker per week is $10, test at 5% significance level the claim of the canteen owner.