Homework: Week 14 Chapter 6 Question 20, 6.3.19-T HW Score: 81.25%, 16.25 of 20 points Part 2 of 3 Score: 0.33 of 1 Save A researcher wishes to estimate, with 90% confidence, the population proportion of adults who eat fast food four to six times per week. Her estimate must be accurate within 2% of the population proportion. (a) No preliminary estimate is available. Find the minimum sample size needed. (b) Find the minimum sample size needed, using a prior study that found that 46% of the respondents said they eat fast food four to six times per week. (c) Compare the results from parts (a) and (b). (a) What is the minimum sample size needed assuming that no prior information is available? n= 1691 (Round up to the nearest whole number as needed.) (b) What is the minimum sample size needed using a prior study that found that 46% of the respondents said they eat fast food four to six times per week? n= (Round up to the nearest whole number as needed.) Enter your answer in the answer box and then click Check Answer. Help Me Solve This View an Example Get More Help - Clear All Final CheckHomework: Week 14 Chapter 6 Question 7, 6.1.37-T HW Score: 81.25%, 16.25 of 20 points Part 4 of 4 Score: 0.67 of 1 Save You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. From a random sample of 71 dates, the mean record high daily temperature in a certain city has a mean of 82.62"F. Assume the population standard deviation is 13.77"F. The 90% confidence interval is ( 79.93 , 85.31 ). (Round to two decimal places as needed.) The 95% confidence interval is ( 79.42 , 85.82 ). (Round to two decimal places as needed.) Which interval is wider? Choose the correct answer below. X The 90% confidence interval The 95% confidence interval Interpret the results. A. You can be certain that the population mean record high temperature is either between the lower bounds of the 90% and 95% confidence intervals or the upper bounds of the 90% and 95% confidence intervals. B. You can be 90% confident that the population mean record high temperature is between the bounds of the 90% confidence interval, and 95% confident for the 95% interval. O C. You can be certain that the mean record high temperature was within the 90% confidence interval for approximately 64 of the 71 days, and was within the 95% confidence interval for approximately 67 of the 71 days O D. You can be 90% confident that the population mean record high temperature is outside the bounds of the 90% confidence interval, and 95% confident for the 95% interval. Question is complete. Tap on the red indicators to see incorrect answers. Help Me Solve This View an Example Get More Help - Similar QuestionHomework: Week 14 Chapter 6 Question 7, 6.1.37-T HW Score: 81.25%, 16.25 of 20 points Part 1 of 4 Save Score: 0.67 of 1 You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. From a random sample of 56 dates, the mean record high daily temperature in a certain city has a mean of 84.83 F. Assume the population standard deviation is 14.67 F. The 90% confidence interval is (). (Round to two decimal places as needed.) Enter your answer in the edit fields and then click Check Answer. Help Me Solve This View an Example Get More Help - Clear All Check AnswerHomework: Week 14 Chapter 6 Question 13, 6.2.19-T HW Score: 81.25%, 16.25 of 20 points Part 1 of 3 Score: 0 of 1 Save In a random sample of twelve cell phones, the mean full retail price was $543.50 and the standard deviation was $179.00. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 95% confidence interval for the population mean u. Interpret the results. Identify the margin of error. dollars Round to one decimal place as needed.) Enter your answer in the answer box and then click Check Answer. Help Me Solve This View an Example Get More Help - Clear All Final Check