A random sample of 50 four-year-olds attending day care centers pro- vided a yearly tuition average of $3987 and the population standard deviation of $630. a) Find the 90% confidence interval for the population yearly tuition average of 50 four-year-olds attending day care centers. b) Estimate the population yearly tuition average of 50 four-year-olds attending day care centers using a 98% UCB. c) If you wish to estimate population tuition average of four-year-olds attend- ing day care centers correct to within $4, with probability equal to .95, how many observations should be included in your sample? No hand written solution and no image

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