Homework Answers
solution
number of confidence intervals=450
confidence level=97%=0.97
=450*0.97
=436.5
the number of intervals that contain population 436.5
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Lecture18: Problem 9 Previous Problem List Next (1 point) If 450 confidence intervals, each having a...
incorrect Lecture18: Problem 9 Previous Problem List Next (1 point) If 450 confidence intervals, each having a 97% l...
incorrect
Lecture18: Problem 9 Previous Problem List Next (1 point) If 450 confidence intervals, each having a 97% level of confidence, were computed for a population meanu, about how many of the intervals can be expected to contain u? 436.5 (Your answer will be an integer, of course.) Note: You can get a new version of this problem after the due date. Preview My Answers Submit Answers You have attempted this problem 1 time. Your overall recorded score is 0%....
Lecture 18: Problem 13 Problem List Next Previous (1 point) If 450 confidence intervals, each having...
Lecture 18: Problem 13 Problem List Next Previous (1 point) If 450 confidence intervals, each having a level of confidence of 98%, were computed for a population mean #, approximately how many of the intervals would be expected to contain ? (Round your answer to the nearest integer.) (Round Preview My Answers Submit Answers
Lecture18: Problem 5 Previous Problem List Next (1 point) The systolic blood pressure (SBP) of a...
Lecture18: Problem 5 Previous Problem List Next (1 point) The systolic blood pressure (SBP) of a certain population is normally distributed with standard deviation 5 mmHg. A sample of 25 members of this population was found to have an average SBP of 118 mmHg. Find a 90% confidence interval for the population mean. Round the endpoints to the nearest integer. Confidence interval is Note: You can earn partial credit on this problem. Note: You can get a new version of...
Lecture18: Problem 7 Previous Problem List Next (1 point) The diameter of the twelve-penny common nails...
Lecture18: Problem 7 Previous Problem List Next (1 point) The diameter of the twelve-penny common nails made by 'Snails!, Inc., is normally distributed with standard deviation 0.004 in. A sample of 37 such nails was found to have a mean diameter of 0.127 in. Find a 90% confidence interval for the mean diameter of all such nails. Round the endpoints to five decimal places. Confidence interval is ( Note: You can earn partial credit on this problem. Note: You can...
webwortorwin-stat200-spring202fecture184 Logg Lecture18: Problem 24 Previous Problem List Next (1 point) The length of time to...
webwortorwin-stat200-spring202fecture184 Logg Lecture18: Problem 24 Previous Problem List Next (1 point) The length of time to complete a door assembly on an automobile factory assembly line is normally distributed with mean j = 7 minutes and standard deviation o = 2.5 minutes. Samples of size 120 are taken. What is the mean value for the sampling distribution of the sample means? Note: You can get a new version of this problem after the due date. Preview My Answers Submit Answers...
Lecture19: Problem 2 Previous Problem List Next (1 point) John measured the total playing time of...
Lecture19: Problem 2 Previous Problem List Next (1 point) John measured the total playing time of 25 randomly chosen CDs from his very large collection and found a mean of 65.2 minutes and a standard deviation of 11.4 minutes. Give the 97% confidence interval for the population mean, assuming that the population is approximately normally distributed. Round the endpoints to two decimal places. Confidence interval:( Note: You can earn partial credit on this problem. Note: You can get a new...
Lecture 19: Problem 9 Problem List Next Previous (1 point) A market research company wanting to determine the avera...
Lecture 19: Problem 9 Problem List Next Previous (1 point) A market research company wanting to determine the average quantity of nuts eaten per year by Americans interviewed 730 Americans and found a sample mean of 3.85 lb. If the company knows that the population standard deviation is 0.85, what is the 92% confidence interval for the population mean? Round your answers to two decimal places. Note: You can earn partial credit on this problem. Note: You can get a...
Lecture19: Problem 4 Previous Problem List Next (1 point) 1Q tests are designed so that the...
Lecture19: Problem 4 Previous Problem List Next (1 point) 1Q tests are designed so that the mean is 100 points and the standard deviation is 15 points for the entire adult population. What is the minimum sample size needed to estimate the average IQ of all Stat 200 students to within 3 points with 96% confidence? Note: You can get a new version of this problem after the due date. Preview My Answers Submit Answers
Lecture 18: Problem 6 Previous Problem List Next (1 point) The average starting salaries for 50...
Lecture 18: Problem 6 Previous Problem List Next (1 point) The average starting salaries for 50 graduates with a certain major was $43947. The standard deviation for all graduates with that major was $8681. Give the 93% confidence interval for the population mean. Round the endpoints to the nearest dollar, and do not put commas in your numbers. Confidence interval: Note: You can earn partial credit on this problem. Note: You can get a new version of this problem after...
Lecture19: Problem 10 Previous Problem List Nest (1 point) Compute, to three decimal places, a 90%...
Lecture19: Problem 10 Previous Problem List Nest (1 point) Compute, to three decimal places, a 90% confidence interval for the mean of a population with o = 24.2, given that a sample of size 50 had a mean of 52.5. Confidence interval: Note: You can earn partial credit on this problem. Note: You can get a new version of this problem after the due date. Preview My Answers Submit Answers
incorrect
Lecture18: Problem 9 Previous Problem List Next (1 point) If 450 confidence intervals, each having a 97% level of confidence, were computed for a population meanu, about how many of the intervals can be expected to contain u? 436.5 (Your answer will be an integer, of course.) Note: You can get a new version of this problem after the due date. Preview My Answers Submit Answers You have attempted this problem 1 time. Your overall recorded score is 0%....
Lecture 18: Problem 13 Problem List Next Previous (1 point) If 450 confidence intervals, each having a level of confidence of 98%, were computed for a population mean #, approximately how many of the intervals would be expected to contain ? (Round your answer to the nearest integer.) (Round Preview My Answers Submit Answers
Lecture18: Problem 5 Previous Problem List Next (1 point) The systolic blood pressure (SBP) of a certain population is normally distributed with standard deviation 5 mmHg. A sample of 25 members of this population was found to have an average SBP of 118 mmHg. Find a 90% confidence interval for the population mean. Round the endpoints to the nearest integer. Confidence interval is Note: You can earn partial credit on this problem. Note: You can get a new version of...
Lecture18: Problem 7 Previous Problem List Next (1 point) The diameter of the twelve-penny common nails made by 'Snails!, Inc., is normally distributed with standard deviation 0.004 in. A sample of 37 such nails was found to have a mean diameter of 0.127 in. Find a 90% confidence interval for the mean diameter of all such nails. Round the endpoints to five decimal places. Confidence interval is ( Note: You can earn partial credit on this problem. Note: You can...
webwortorwin-stat200-spring202fecture184 Logg Lecture18: Problem 24 Previous Problem List Next (1 point) The length of time to complete a door assembly on an automobile factory assembly line is normally distributed with mean j = 7 minutes and standard deviation o = 2.5 minutes. Samples of size 120 are taken. What is the mean value for the sampling distribution of the sample means? Note: You can get a new version of this problem after the due date. Preview My Answers Submit Answers...
Lecture19: Problem 2 Previous Problem List Next (1 point) John measured the total playing time of 25 randomly chosen CDs from his very large collection and found a mean of 65.2 minutes and a standard deviation of 11.4 minutes. Give the 97% confidence interval for the population mean, assuming that the population is approximately normally distributed. Round the endpoints to two decimal places. Confidence interval:( Note: You can earn partial credit on this problem. Note: You can get a new...
Lecture 19: Problem 9 Problem List Next Previous (1 point) A market research company wanting to determine the average quantity of nuts eaten per year by Americans interviewed 730 Americans and found a sample mean of 3.85 lb. If the company knows that the population standard deviation is 0.85, what is the 92% confidence interval for the population mean? Round your answers to two decimal places. Note: You can earn partial credit on this problem. Note: You can get a...
Lecture19: Problem 4 Previous Problem List Next (1 point) 1Q tests are designed so that the mean is 100 points and the standard deviation is 15 points for the entire adult population. What is the minimum sample size needed to estimate the average IQ of all Stat 200 students to within 3 points with 96% confidence? Note: You can get a new version of this problem after the due date. Preview My Answers Submit Answers
Lecture 18: Problem 6 Previous Problem List Next (1 point) The average starting salaries for 50 graduates with a certain major was $43947. The standard deviation for all graduates with that major was $8681. Give the 93% confidence interval for the population mean. Round the endpoints to the nearest dollar, and do not put commas in your numbers. Confidence interval: Note: You can earn partial credit on this problem. Note: You can get a new version of this problem after...
Lecture19: Problem 10 Previous Problem List Nest (1 point) Compute, to three decimal places, a 90% confidence interval for the mean of a population with o = 24.2, given that a sample of size 50 had a mean of 52.5. Confidence interval: Note: You can earn partial credit on this problem. Note: You can get a new version of this problem after the due date. Preview My Answers Submit Answers
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