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Lecture19: Problem 10 Previous Problem List Nest (1 point) Compute, to three decimal places, a 90%...
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...
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
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...
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...
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...
< webworkorwin-stat200-spring2020ecture19 Lecture19: Problem 8 Previous Problem List Next (1 point) You have only one chance...
< webworkorwin-stat200-spring2020ecture19 Lecture19: Problem 8 Previous Problem List Next (1 point) You have only one chance at this problem. If the level of confidence is decreased but the sample size is not changed, how will the confidence interval for the population mean change? O A. It will remain the same B. It is not possible to determine how it will change OC. It will get wider D. It will get narrower Preview My Answers Submit Answers
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...
Lecture 19: Problem 1. Previous Problem List Next (1 point) The table below shows the lengths...
Lecture 19: Problem 1. Previous Problem List Next (1 point) The table below shows the lengths of some randomly chosen CDs in John's very large collection. Give the 93% confidence interval for the population mean, assuming that the population is approximately normally distributed. Round the endpoints to two decimal places. 53.47 64.0935.87 64.78 47.13 67.85 38.29 39.02 39.77 44.89 37.96 37.91 74.12 67.82 57.31 60.52 68.88 54.76 57.78 56.38 43.77 54.23 38.21 59.32 71.33 Confidence interval: Note: You can earn...
Lecture19: Problem 5 Previous Problem List Next (1 point) A long history of testing water samples in a certain lake...
Lecture19: Problem 5 Previous Problem List Next (1 point) A long history of testing water samples in a certain lake has shown that the level of a certain pollutant is approximately normally distributed with standard deviation 4.9 mg/L. What is the minimum number of samples required to estimate today's level to with in 0.6 mg/L with 91% confidence? ZC = 1.7 n = 193 Note: You can get a new version of this problem after the due date. Preview My...
Lecture19: Problem 3 Previous Problem List Next (1 point) Studies have suggusted that twins, in their...
Lecture19: Problem 3 Previous Problem List Next (1 point) Studies have suggusted that twins, in their early years, tend to have lower IQs and pick up language more slowly than non-twins. The slower intellectual growth may be caused by benign parental neglect. Suppose it is desired to estimate the mean attention time given to twins per week by their parents. A sample of 30 sets of two-year-old twin boys was taken, and after one week the attention time received was...
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...
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
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...
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...
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...
< webworkorwin-stat200-spring2020ecture19 Lecture19: Problem 8 Previous Problem List Next (1 point) You have only one chance at this problem. If the level of confidence is decreased but the sample size is not changed, how will the confidence interval for the population mean change? O A. It will remain the same B. It is not possible to determine how it will change OC. It will get wider D. It will get narrower Preview My Answers Submit Answers
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...
Lecture 19: Problem 1. Previous Problem List Next (1 point) The table below shows the lengths of some randomly chosen CDs in John's very large collection. Give the 93% confidence interval for the population mean, assuming that the population is approximately normally distributed. Round the endpoints to two decimal places. 53.47 64.0935.87 64.78 47.13 67.85 38.29 39.02 39.77 44.89 37.96 37.91 74.12 67.82 57.31 60.52 68.88 54.76 57.78 56.38 43.77 54.23 38.21 59.32 71.33 Confidence interval: Note: You can earn...
Lecture19: Problem 5 Previous Problem List Next (1 point) A long history of testing water samples in a certain lake has shown that the level of a certain pollutant is approximately normally distributed with standard deviation 4.9 mg/L. What is the minimum number of samples required to estimate today's level to with in 0.6 mg/L with 91% confidence? ZC = 1.7 n = 193 Note: You can get a new version of this problem after the due date. Preview My...
Lecture19: Problem 3 Previous Problem List Next (1 point) Studies have suggusted that twins, in their early years, tend to have lower IQs and pick up language more slowly than non-twins. The slower intellectual growth may be caused by benign parental neglect. Suppose it is desired to estimate the mean attention time given to twins per week by their parents. A sample of 30 sets of two-year-old twin boys was taken, and after one week the attention time received was...
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