- How Smart Is Your Phone A Random Sample Of 9 Samsung Galaxy Smartphones Being Sold Over The Internet In 2013 Had The Fo 1 (21.88 KiB) Viewed 28 times
(a) Explain why it is necessary to check whether the population is approximately normal before constructing a confidence interval. It is necessary to check whether the population is approximately normal because the population standard deviation is not known ▼ Part: 1 / 3 Part 2 of 3 (b) Following is a dotplot of these data. Is it reasonable to assume that the population is approximately normal? 100 150 200 It is is is not . 250 300 350 400 . reasonable to assume that the population is approximately normal. X X Espa
(c) If appropriate, construct a 99.5% confidence interval for the mean price for all phones of this type being sold on the Internet in 2013. Round your intermediate step to three decimal places. Round your answer to one decimal place. A 99.5% confidence interval for the mean price for all phones of this type being sold on the Internet in 2013 is <μ< X