The grade point averages for 10 randomly selected junior college students are listed below. Assume the grade point averages are normally distributed. Find a 98% confidence interval for the true mean. 2.0 3.2 1.8 2.9 0.9 4.0 3.3 2.9 3.6 0.8 Group of answer choices (1.55, 3.53) (2.12, 3.14) (3.11, 4.35) (0.67, 1.81)

Listed below are student evaluation ratings of​ courses, where a rating of 5 is for​ "excellent." The ratings were obtained at one university in a state. Construct a confidence interval using a 95​% confidence level. What does the confidence interval tell about the population of all college students in the​ state?   3.9​, 3.0​, 4.2​, 4.7​, 3.0​, 4.3​, 3.7​, 4.9​, 4.4​, 4.4​, 4.4​, 3.9​, 3.2​, 3.9​, 3.6    What is the confidence interval for the population mean μ​?     ​(Round to two decimal places as​ needed.

Keisha wants to estimate the percentage of managers at her company that hold an MBA. She surveys 320 managers and finds that 70 hold an MBA. Find the margin of error for the confidence interval for the population proportion with a 90% confidence level. z0.10 z0.05 z0.025 z0.01 z0.005 1.282 1.645 1.960 2.326 2.576   Use the table of common z-scores above. Round the final answer to three decimal places.

2-C. Construct and interpret a confidence interval to estimate the mean height of the population. You must first write the formula for the confidence interval and then substitute your appropriate numbers.   Person 1 Person 2 Person 3 Person 4 Person 5 Person 6 Person 7 Person 8 Person 9 Height (inches) 69 67 67 64 68 69 58 74 70 Shoe Size 10 9.5 10 9 9.5 11 6 11.5 10.5

Answer+ 14. For each of the following three sample sizes, construct the 95% confidence interval for the population proportion. Use a sample proportion of 0.40 throughout. What happens to interval width as sample size increases? Why? P = 0.40 Sample A: N= 100 Sample B: N 1000 Sample C: N= 10,000 7.15. PS Two individuals are running for mayor of a large city. You conduct an election survey a week before the election and find that 51% of the respondents prefer candidate A. Can you predict a winner? Use the 99% level. (HINT: In a two-candidate race, what percentage of the vote would the winner need? Does the confidence interval indicate that candidate A has a sure margin of victory? 72°F 409 4. 141 44 Insert 96 4 G.

Listed below are student evaluation ratings of courses, where a rating of 5 is for "excellent." The ratings were obtained at one university in a state. Construct a confidence interval using a 99% confidence level. What does the confidence interval tell about the population of all college students in the state? 3.7, 3.1, 3.8, 4.9, 3.1, 4.1, 3.5, 4.7, 4.0, 4.3, 4.5, 3.9, 3.4, 3.7, 3.6 What is the confidence interval for the population mean μ? <μ< (Round to two decimal places as needed.) What does the confidence interval tell about the population of all college students in the state? Select the correct choice below and, if necessary, fill in the answer box(es) to complete your choice. O A. We are confident that 99% of all students gave evaluation ratings between and (Round to one decimal place as needed.) O B. The results tell nothing about the population of all college students in the state, since the sample is from only one university. C. We are 99% confident that the interval from to…

Give a 99.9% confidence interval, for u1 H2 given the following information. 25, 1 = 2.21, s1 55, 72 = 2.45, s2 = 0.92 0.37

Virginia wants to estimate the percentage of students who live more than three miles from the school. She wants to create a 95% confidence interval which has a margin of error of at most 5%. How many students should be polled to create the confidence interval? z0.10 z0.05 z0.025 z0.01 z0.005 1.282 1.645 1.960 2.326 2.576 Use the table of values above.

A statistics instructor randomly selected four bagn of oranges, each bag labeled 10 pounds, and weighed the bags. They weighed 9.5, 9.7,9.5, and 9.5 pounds. O Assume that the distribution of weights is Normal. Find a 95% confidence interval for the mean weight of all bags of oranges. Use technology for your calculations Answer parts a and b below. a. Choose the correct interpretation of the confidence interval below and, if necessary, fil in the answer boxes to complete your choice. OA. We are 95% confident the population mean is betweenand OB. We are 95% confident that the sample mean is between and OC. There is a 95% chance that all ntervals will be between and OD. The requirements for constructing a confidence interval are not satisfied. (Type integers or decimals rounded to the nearest thousandth as needed. Use ascending order.) nti ou Res "ptil atie

The mean number of sick days an employee takes per year is believed to be about ten. Members of a personnel department do not believe this figure. They randomly survey eight employees. The number of sick days they took for the past year are as follows: 12; 4; 15; 3; 11; 8; 6; 8. Let x = the number of sick days they took for the past year. Construct a 95% confidence interval for the true mean or proportion. Round to the nearest hundredth (2 decimal places).