A machine produces metal rods used in an automobile suspension system. A randomsample of 15 rods is selected, and the diameter is measured. The resulting data (inmillimeters) are as follows:8.24 8.25 8.20 8.23 8.24 8.21 8.26 8.26 8.20 8.25 8.23 8.23 8.19 8.28 8.24(A) Calculate a 95% two-sided confidence interval on mean rod diameter.R(B) Calculate a 95% upper confidence bound on the mean. Compare this bound withthe upper bound of the two-sided confidence interval and discuss why they aredifferent.

Step 1: Calculate the sample mean and the sample standard deviation.Before we proceed with…

Answered: A machine produces metal rods used in…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The average salary of 64 employee was 5400 and the sample standard deviation was 260. Find the 90 % confidence interval for the population mean salary. Select one: O a. 5400 ± 52.16 O b. 5400 + 56.33 c. 5400 + 58.42 O d. 5400 ± 54.24
In a random sample of seven cell phones, the mean full retail price was $402.50 and the standard deviation was $228.00. 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 μ. Interpret the results.
A machine produces metal rods used in an automobile suspension system. A random sample of 15 rods is selected, and the diameter is measured. The resulting data (in millimeters) are as follows: 8.24 8.25 8.20 8.23 8.24 8.21 8.26 8.26 8.20 8.25 8.23 8.23 8.19 8.28 8.24 a) Calculate a 95% two-sided confidence interval on mean rod diameter. b) Compute a 95% prediction interval on the diameter of the next rod tested. Compare the length of the prediction interval with the length of the 95% Cl on the population mean. A machine produces metal rods used in an automobile suspension system. A random sample of 15 rods is selected, and the diameter is measured. The resulting data (in millimeters) are as follows: 8.24 8.25 8.20 8.23 8.24 8.21 8.26 8.26 8.20 8.25 8.23 8.23 8.19 8.28 8.24 a) Calculate a 95% two-sided confidence interval on mean rod diameter. b) Compute a 95% tolerance interval that will contain 99% of the production. Compare the length of the prediction interval with the length of the…
The diameters (in inches) of 17 randomly selected bolts produced by a machine are listed. Use a 99% level of confidence to construct a confidence interval for (a) the population variance o and (b) the population standard deviation o. Interpret the results 4.479 4412 4.035 4.316 4.006 3.799 3.814 3.766 4243 3.979 4.111 4.567 3.949 3.753 3.877 3.833 4.433 (a) The confidence interval for the population variance is (Round to three decimal places as needed.) Interpret the results. Select the correct choice below and fill in the answer box(es) to complete your choice. (Round to three decimal places as needed.) O A. With 1% confidence, it can be said that the population variance is between O B. With 1% confidence, it can be said that the population variance is greater than and OC. With 99% confidence, it can be said that the population variance is less than O D. With 99% confidence, it can be said that the population variance is between and (b) The confidence interval for the population…
Random samples of two species of iris gave the following petal lengths (in cm). x1, Iris virginica 5.9 5.9 4.5 4.9 5.7 4.8 5.8 6.4 5.9 5.9 x2, Iris versicolor 4.5 4.6 4.7 5.0 3.8 5.1 4.4 4.2 (a) Use a 5% level of significance to test the claim that the population standard deviation of x1 is larger than 0.55.What is the level of significance? Find the value of the chi-square statistic for the sample. (Round your answer to two decimal places.)What are the degrees of freedom? (b) Find a 90% confidence interval for the population standard deviation of x1. (Round your answers to two decimal places.) lower limit upper limit (c) Use a 1% level of significance to test the claim that the population variance of x1 is larger than that of x2. Interpret the results.What is the level of significance? Find the value of the sample F statistic. (Round your answer to two decimal places.)What are the degrees of freedom? dfN = dfD =
In a random sample of ten people, the mean driving distance to work was 22.5 miles and the standard deviation was 5.6 miles. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 90% confidence interval for the population mean u. Interpret the results. Identify the margin of error. (Rou e as needed.) Con square miles interval for the population mean. miles (Rou miles per hour e as needed.) Interpret the results. Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or a decimal. Do not round.) OA. % of all random samples of ten people from the population will have a mean driving distance to work (in miles) that is between the interval's endpoints. B. With % confidence, it can be said that the population mean driving distance to work (in miles) is between the interval's endpoints. O C. It can be said that % of the population has a driving distance to work (in miles) that is…
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A sample of 19 elements was used to construct a 99% confidence interval for the population variance, the chi-square value (s) used for this test are: Select one: a. 7.015 to 34.805 b. 7.633 to 36.191 O c. 6.844 to 38.582 d. 6.265 to 37.156 ge Next page ETIVITY NEXT ACTIVITY Jump to. Midterm 1
In a sample of 100 individuals, the average height is 170 cm and the standard deviation is 15 cm. Using a 95% confidence level, what is the margin of error for the mean height of the population?

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