The interval from -2.4 to 1.73 captures an area of 0.95 under the z curve. This implies that another large-sample 95% confidence interval for μ has lower limit x -2.4 and upper limit x + 1.73. Would you recommend using this 95% interval over the 95% Vn vn interval x ± 1.96 discussed in the text? Explain. (Hint: Look at the width of each interval.) The new 95% interval has width Need Help? Read It The 95% interval discussed in the text has width √ The new interval is-Select-- --Select-- wider than the same width as narrower than ✓the interval discussed in the text, so the new interval ---Select---
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Q: ❎❎✅♦️♦️♦️✅✅✅✅♦️
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- A simple random sample of size n is drawn. The sample mean, x, is found to be 19.2, and the sample standard deviation, s, is found to be 4.2. Click the icon to view the table of areas under the t-distribution. (a) Construct a 95% confidence interval about u if the sample size, n, is 34. Upper bound: (Use ascending order. Round to two decimal places as needed.) Lower bound: (b) Construct a 95% confidence interval about u if the sample size, n, is 51. Lower bound:: Upper bound: (Use ascending order. Round to two decimal places as needed.) How does increasing the sample size affect the margin of error, E? O A. The margin of error decreases. O B. The margin of error does not change. OC. The margin of error increases. (c) Construct a 99% confidence interval about u if the sample size, n, is 34. Lower bound: Upper bound: (Use ascending order. Round to two decimal places as needed.) Compare the results to those obtained in part (a). How does increasing the level of confidence affect the size…A simple random sample of size n is drawn. The sample mean, x, is found to be 19.5, and the sample standard deviation, s, is found to be 4.6. Click the icon to view the table of areas under the t-distribution. Next Question (a) Construct a 95% confidence interval about u if the sample size, n, is 34. Lower bound: 17.89 ; Upper bound: 21.11 (Use ascending order. Round to two decimal places as needed.) (b) Construct a 95% confidence interval about u if the sample size, n, is 51. Lower bound: Upper bound: (Use ascending order. Round to two decimal places as needed.) Enter your answer in the edit fields and then click Check Answer 4 parts remaining Clear All Type here to search DELL F10 F9 F8 F7 F6 F5 F3 4) F4 K4 F2 & 8o 立10. A trattic control engineer reports that 75% of the vehicles passine throush a checkpoint are from within Metro Manila for the next 5 vehicles. A) Construct the PMF histogram for the number of vehicles that are from within Metro Manila, B) What is the probability that less than 3 are from within Metro Manila? C) Calculate the mean and the variance of the number of vehicles that are rom within Metro Manila
- A simple random sample of size n is drawn. The sample mean, x, is found to be 18.9, and the sample standard deviation, s, is found to be 4.1. Click the icon to view the table of areas under the t-distribution. (a) Construct a 95% confidence interval about μ if the sample size, n, is 35. Lower bound: 17.49; Upper bound: 20.31 (Use ascending order. Round to two decimal places as needed.) (b) Construct a 95% confidence interval about μ if the sample size, n, is 51. Lower bound: 17.75; Upper bound: 20.05 (Use ascending order. Round to two decimal places as needed.) How does increasing the sample size affect the margin of error, E? O A. The margin of error increases. B. The margin of error decreases. C. The margin of error does not change. (c) Construct a 99% confidence interval about μ if the sample size, n, is 35. Lower bound:: Upper bound: (Use ascending order. Round to two decimal places as needed.)A simple random sample of size n is drawn. The sample mean, x, is found to be 18.4, and the sample standard deviation, s, is found to be 4.8. Click the icon to view the table of areas under the t-distribution. (a) Construct a 95% confidence interval about µ if the sample size, n, is 35. μ Lower bound: 16.75; Upper bound: 20.05 (Use ascending order. Round to two decimal places as needed.) (b) Construct a 95% confidence interval about µ if the sample size, n, is 61. μ Lower bound:; Upper bound: (Use ascending order. Round to two decimal places as needed.)The standard deviation of test scores on a certain achievement test is 10.5 . A random sample of 100 scores on this test had a mean of 75.7 . Based on this sample, find a 90% confidence interval for the true mean of all scores. Then give its lower limit and upper limit. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. upper limit ? lower limit?
- The standard deviation for a population is σ = 7.80 . A random sample selected from this population gave a mean equal to 48.70 . Construct a 95 % confidence interval for μ assuming n = 100 .Round your answers to two decimal places. = ( to )A simple random sample of size n is drawn. The sample mean, x, is found to be 17.7, and the sample standard deviation, s, is found to be 4.7. Click the icon to view the table of areas under the t-distribution. (a) Construct a 95% confidence interval about u if the sample size, n, is 34. Lower bound: 16.06 ; Upper bound: 19.34 (Use ascending order. Round to two decimal places as needed.) (b) Construct a 95% confidence interval about u if the sample size, n, is 51. Lower bound: Upper bound: (Use ascending order. Round to two decimal places as needed.) Enter your answer in the edit fields and then click Check Answer. Clear All parts remainingT17
- A random sample of students taking STAT 201 this semester was pulled. Among other things, the survey asked the number of hours the student spent studying for the final exam. StatCrunch was used to create the output for a 95% confidence interval estimate for the population mean number of hours students spend studying for the final exam. 95% confidence interval results: Variable Sample Mean Std. Err. DF L. Limit U. Limit # hours 6.05 0.31 64 5.42 6.67 Give the value of the point estimate used to calculate the confidence interval. (Do not round your answer)A simple random sample of size n is drawn. The sample mean, x, is found to be 18.2, and the sample standard deviation, s, is found to be 4.9. LOADING... Click the icon to view the table of areas under the t-distribution. (a) Construct a 95% confidence interval about μ if the sample size, n, is 34. Lower bound: 16.4916.49; Upper bound: 19.9119.91 (Use ascending order. Round to two decimal places as needed.) (b) Construct a 95% confidence interval about μ if the sample size, n, is 61. Lower bound: 16.9516.95; Upper bound: 19.4619.46 (Use ascending order. Round to two decimal places as needed.) How does increasing the sample size affect the margin of error, E? A. The margin of error does not change. B. The margin of error decreases. Your answer is correct. C. The margin of error increases. (c) Construct a 99% confidence interval about μ if the sample size, n, is 34. Lower bound: 15.9015.90; Upper bound:…The standard deviation of test scores on a certain achievement test is 10.7. A random sample of 80scores on this test had a mean of 71.3. Based on this sample, find a 99% confidence interval for the true mean of all scores. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) What is the lower limit of the 99% confidence interval? What is the upper limit of the 99% confidence interval?