To check : Whether the standard normal distribution or the t -distribution, or neither should used to construct a 95% confidence interval for the population mean . To construct and interpret : The 95% confidence interval for the population mean μ .

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Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

Chapter 8, Problem 4CR

To determine

To check: Whether the standard normal distribution or the t-distribution, or neither should used to construct a 95% confidence interval for the population mean.

To construct and interpret: The 95% confidence interval for the population mean μ .

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- + ++ Table 2: Crack Experiment for Exercise 2 A B C D Treatment Combination (1) Replicate I II 7.037 6.376 14.707 15.219 |++++ 1 བྱ॰༤༠སྦྱོ སྦྱོཋཏྟཱུ a b ab 11.635 12.089 17.273 17.815 с ас 10.403 10.151 4.368 4.098 bc abc 9.360 9.253 13.440 12.923 d 8.561 8.951 ad 16.867 17.052 bd 13.876 13.658 abd 19.824 19.639 cd 11.846 12.337 acd 6.125 5.904 bcd 11.190 10.935 abcd 15.653 15.053 Question 3 Continuation of Exercise 2. One of the variables in the experiment described in Exercise 2, heat treatment method (C), is a categorical variable. Assume that the remaining factors are continuous. (a) Write two regression models for predicting crack length, one for each level of the heat treatment method variable. What differences, if any, do you notice in these two equations? (b) Generate appropriate response surface contour plots for the two regression models in part (a). (c) What set of conditions would you recommend for the factors A, B, and D if you use heat treatment method C = +? (d) Repeat…

Question 2 A nickel-titanium alloy is used to make components for jet turbine aircraft engines. Cracking is a potentially serious problem in the final part because it can lead to nonrecoverable failure. A test is run at the parts producer to determine the effect of four factors on cracks. The four factors are: pouring temperature (A), titanium content (B), heat treatment method (C), amount of grain refiner used (D). Two replicates of a 24 design are run, and the length of crack (in mm x10-2) induced in a sample coupon subjected to a standard test is measured. The data are shown in Table 2. 1 (a) Estimate the factor effects. Which factor effects appear to be large? (b) Conduct an analysis of variance. Do any of the factors affect cracking? Use a = 0.05. (c) Write down a regression model that can be used to predict crack length as a function of the significant main effects and interactions you have identified in part (b). (d) Analyze the residuals from this experiment. (e) Is there an…

A 24-1 design has been used to investigate the effect of four factors on the resistivity of a silicon wafer. The data from this experiment are shown in Table 4. Table 4: Resistivity Experiment for Exercise 5 Run A B с D Resistivity 1 23 2 3 4 5 6 7 8 9 10 11 12 I+I+I+I+Oooo 0 0 ||++TI++o000 33.2 4.6 31.2 9.6 40.6 162.4 39.4 158.6 63.4 62.6 58.7 0 0 60.9 3 (a) Estimate the factor effects. Plot the effect estimates on a normal probability scale. (b) Identify a tentative model for this process. Fit the model and test for curvature. (c) Plot the residuals from the model in part (b) versus the predicted resistivity. Is there any indication on this plot of model inadequacy? (d) Construct a normal probability plot of the residuals. Is there any reason to doubt the validity of the normality assumption?

Answer 2

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Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

Chapter 8, Problem 4CR

To determine

To check: Whether the standard normal distribution or the t-distribution, or neither should used to construct a 95% confidence interval for the population mean.

To construct and interpret: The 95% confidence interval for the population mean μ .

Expert Solution & Answer

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Check out a sample textbook solution

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Answer 3

Question

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

Chapter 8, Problem 4CR

To determine

To check: Whether the standard normal distribution or the t-distribution, or neither should used to construct a 95% confidence interval for the population mean.

To construct and interpret: The 95% confidence interval for the population mean μ .

Expert Solution & Answer

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Check out a sample textbook solution

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Answer 4

Question

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

Chapter 8, Problem 4CR

To determine

To check: Whether the standard normal distribution or the t-distribution, or neither should used to construct a 95% confidence interval for the population mean.

To construct and interpret: The 95% confidence interval for the population mean μ .

Expert Solution & Answer

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Check out a sample textbook solution

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Answer 5

Chapter 8, Problem 4CR

To determine

To check: Whether the standard normal distribution or the t-distribution, or neither should used to construct a 95% confidence interval for the population mean.

To construct and interpret: The 95% confidence interval for the population mean μ .

Answer 6

Chapter 8, Problem 4CR

To determine

To check: Whether the standard normal distribution or the t-distribution, or neither should used to construct a 95% confidence interval for the population mean.

To construct and interpret: The 95% confidence interval for the population mean μ .

Answer 7

Chapter 8, Problem 4CR

To determine

To check: Whether the standard normal distribution or the t-distribution, or neither should used to construct a 95% confidence interval for the population mean.

To construct and interpret: The 95% confidence interval for the population mean μ .

Answer 8

Expert Solution & Answer

Answer 9

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Answer 10

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Answer 11

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To check : Whether the standard normal distribution or the t -distribution, or neither should used to construct a 95% confidence interval for the population mean . To construct and interpret : The 95% confidence interval for the population mean μ .

Solution Summary: The author explains how the t -distribution should be used to construct a 95% confidence interval for the population mean.

Videos

To check: Whether the standard normal distribution or the t-distribution, or neither should used to construct a 95% confidence interval for the population mean.

To construct and interpret: The 95% confidence interval for the population mean μ .

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Chapter 8 Solutions

To check : Whether the standard normal distribution or the t -distribution, or neither should used to construct a 95% confidence interval for the population mean . To construct and interpret : The 95% confidence interval for the population mean μ .

Solution Summary: The author explains how the t -distribution should be used to construct a 95% confidence interval for the population mean.

Videos

To check: Whether the standard normal distribution or the t-distribution, or neither should used to construct a 95% confidence interval for the population mean. To construct and interpret: The 95% confidence interval for the population mean μ .

Want to see the full answer?

Chapter 8 Solutions

To check: Whether the standard normal distribution or the t-distribution, or neither should used to construct a 95% confidence interval for the population mean.

To construct and interpret: The 95% confidence interval for the population mean μ .