Question 2 You want to check if the sample size your manager has for advertising spending is big enough. Calculate the sample size for a 90% confidence interval if the standard deviation is 10 and the...

Question 2

You want to check if the sample size your manager has for advertising spending is big enough. Calculate the sample size for a 90% confidence interval if the standard deviation is 10 and the allowed error is 3. Round to a whole (ie no decimals).