May i know the answer of Question 2? QUESTION 1 A store manager has records of t

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May i know the answer of Question 2?

QUESTION 1 A store manager has records of the amounts spent by the most recent shoppers. Of the last 100 shoppers, the average amount spent is $18.42. It is known from store records that the standard deviation is $5.27. Calculate the 95% margin of errore, in the mean amount spent by all shoppers. For 95% confidence use Z-1 96. Give your answer in dollars correct to the nearest cent e to two dec a. places). Do NOT put a dollar sign in your answer QUESTION 2 usi gthe information in the previous question, calculate the sample size required to give 99% confidence e-31.30. For 99% confidence, use Z-2.576. the margin of error s QUESTION 3 A multi-national company wishes to gauge interest in the possibility of introducing a four day working week, but where the employees work extra hours on their working days to make up the full 40 hours per week. From a sample of 60 workers 27 are in favour of the four day working week. Calculate the 90% margin of error, e, for the proportion of all the company employees who would be in favour of the four day working week. For 90% confidence, use Z-1 645 Give your answer as a decimal to three places

Explanation / Answer

E = Z * sd/sqrt(n)

Or, 1.3 = 2.576 * 5.27/sqrt (n)

Or, n = 109.1 or 109 (approx)

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