You Tube d Amazon eBay G Google Addons Store G Gmail YouTube New Tab Maps Registration Term G Beka Bante - Printin.. 14 - Test 4 (Week 14) i Saved Help 8 A survey of 25 randomly selected "iPhone" owners showed that the purchase price has a mean of $430 with a sample standard deviation of $160. a. Compute the standard error of the sample mean. (Round the final answer to the nearest whole number.) Standard error 8 01:40-35 b. Compute the 80% confidence interval for the mean. (Round the final answers to 2 decimal places.) The confidence interval is between $ and $ c. How large a sample is needed to estimate the population mean within $15 at a 80% degree of confidence? (Round the final answe to the nearest whole number.) Sample size