= Homework: Sec 6.4 Question 10, 6.4.23-T HW Score: 72.63%, 13.8 of 19 Part 2 of 4 points O Points: 0 of 1 Save The waiting times (in minutes) of a random sample of 22 people at a bank have a sample standard deviation of 3.8 Question list K minutes. Construct a confidence interval for the population variance o and the population standard deviation o. Use a 99% level of confidence. Assume the sample is from a normally distributed population. Question 5 Question 6 What is the confidence interval for the population variance o2? (7.3 , 37.7 ) (Round to one decimal place as needed.) Question 7 Interpret the results. Select the correct choice below and fill in the answer box(es) to complete your choice. (Round to one decimal place as needed.) O A. With 99% confidence, you can say that the O B. With 1% confidence, you can say that the Question 8 population variance is greater than population variance is less than O C. With 99% confidence, you can say that the O D. With 1% confidence, you can say that the and Question 9 population variance is between population variance is between and Question 10 Question 11 Question 12 Help me solve this View an example Get more help - Clear all Check answerQuestion 13, 7.2.42-T HW Score: 73.77%, 14.02 of 19 Homework: Sec 7.2 Part 4 of 6 points Points: 0.28 of 1 Save K A scientist estimates that the mean nitrogen dioxide level in a city is greater than Question list 24 parts per billion. To test this estimate, you determine the nitrogen dioxide levels 18 25 26 37 24 30 31 19 38 27 28 for 31 randomly selected days. The results (in parts per billion) are listed to the 39 25 17 24 35 17 17 16 32 17 29 right. Assume that the population standard deviation is 11. At a = 0.02, can you 24 24 27 37 43 39 22 35 39 support the scientist's estimate? Complete parts (a) through (e). Question 8 (a) Write the claim mathematically and identify Ho and Ha. Choose from the following. Question 9 O A. Ho: H = 24 (claim) O B. Ho: HS 24 (claim) &C. Ho: HS 24 Ha: H > 24 Ha: H > 24 Ha: [ > 24 (claim) Question 10 O D. HO: H 24 (claim) Question 11 (b) Find the critical value and identify the rejection region. Zo = 2.05 (Round to two decimal places as needed.) Question 12 Rejection region: z > 2.05 (c) Find the standardized test statistic. Question 13 z= (Round to two decimal places as needed.) Question 14 X Vi VI More Help me solve this View an example Get more help - Clear all Check answerQuestion 14, 7.2.39-T HW Score: 73.77%, 14.02 of 19 KO E Homework: Sec 7.2 Part 5 of 5 points Points: 0.22 of 1 Save K A fast food restaurant estimates that the mean sodium content in one of its breakfast sandwiches is no more than 910 Question list milligrams. A random sample of 40 breakfast sandwiches has a mean sodium content of 901 milligrams. Assume the population standard deviation is 24 milligrams. At a = 0.05, do you have enough evidence to reject the restaurant's claim? Complete parts (a) through (e). Question 8 Identify the rejection region(s). Select the correct choice below. Question 9 A. The rejection region is z > 1.64. X B. The rejection regions are z > 1.64 and z 1.960. Reject H0 because - 1.960 1.960. Fail to reject H{J because - 1.960