ctmath.com/alekscgi/x/Isl.exe/10_u-IgNslkr7j8P3jH-lixuiHIKonusKqwxL4LqHw5_zILAVamAGKQy3no7w6c10kXWb57gz8RviXV HW B. 1 Confidence Intervals for a Population Mean, Standard Deviation Known 3 1 2 3 4 5 6 7 7 Question 7 of 7 (1pun) |Anample Unimed View carstion in a popup Let's shake on Iti A random sample of 12-ounce milkshakes from 11 fast-food restaurants had the following number of calories. C 375 603 173 476 504 510 472 700 642 591 580 Sund data to Excel Assume the population standard deviation Is o = $5 Part 1 of 3 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 sample size is less than or equal to 30 Part 2 of 3 Following is a dotplot of these data. Is it ressonable to assume that the population is approximately normal? smi It | reasonable to assume that the population is approximately normal. Part: 27 3 Part 3 of 3 If appropriate, construct a 80%% confidence interval for the mean calorie count for all 12- ounce milkshakes sold at fast-food restaurants. Round the answers to at least two decimal placer- A 80%% confidence interval for the mean calorie count for all 12-ounce milkshakes sold at fast food restaurants (