Questions from Applied Statistics

Q: Which statement is incorrect? Explain. a. Correlation

Which statement is incorrect? Explain. a. Correlation uses a t-test with n - 2 degrees of freedom. b. Correlation analysis assumes that X is independent and Y is dependent. c. Correlation analysis is...

Q: Based on the information in this ANOVA table, the coefficient of

Based on the information in this ANOVA table, the coefficient of determination R2 is a. 0.499 b. 0.501 c. 0.382

Q: In a test of the regression model Y = β0 + β1X

In a test of the regression model Y = β0 + β1X with 27 observations, what is the critical value of t to test the hypothesis that β1 = 0 using α = .05 in a two-tailed test? a. 1.960 b. 2.060 c. 1.70...

Q: For each of the following fitted trends, make a prediction for

For each of the following fitted trends, make a prediction for period t = 17: a. yt = 2286 e.076t b. yt = 1149 + 12.78t c. yt = 501 + 18.2t - 7.1t2

Q: (a) Plot the data on leisure and hospitality employment.

(a) Plot the data on leisure and hospitality employment. (b) Describe the trend (if any) and discuss possible causes. (c) Fit the linear and exponential trends. Would these trend models give credible...

Q: (a) Plot the data on lightning deaths. (b

(a) Plot the data on lightning deaths. (b) Describe the trend (if any) and discuss possible causes. (c) Fit an exponential trend to the data. Interpret the fitted equation. (d) Make a forecast for 201...

Q: Define three quality metrics that might be used to describe quality and

Define three quality metrics that might be used to describe quality and performance in the following consumer products: (a) your personal vehicle (e.g., car, SUV, truck, bicycle, motorcycle); (b) the...

Q: Bob said, “They must not be using quality control in

Bob said, “They must not be using quality control in automobile manufacturing. Just look at the J.D. Power data showing that new cars all seem to have defects.” (a) Discuss Bob’s assertion, focusing o...

Q: Which statement is false? Explain. a. If

Which statement is false? Explain. a. If P(A) = .05, then the odds against event A’s occurrence are 19 to 1. b. If A and B are mutually exclusive events, then P (A ∪ B) = 0. c. The number of permutat...

Q: Why are the control limits for an R chart asymmetric, while

Why are the control limits for an R chart asymmetric, while those of an
chart are symmetric?