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Correlation and Simple Regression. May Brothers Department Store has conducted a survey to learn the buying intentions of a sample of 62 department store customers. The survey asked each customer their household gross income (in $ thousands), and their number of shopping trips per year.
A. Interpret the coefficient of correlation between the TRIPS and INCOME variables of 0.8.
B. Interpret the following results for a simple regression over this sample where TRIPS is the dependent Y variable and INCOME is the independent X-variable: The regression equation is: TRIPs = 0.5 + 0.1 INCOME Predictor Coef Stdev t ratio Constant 0.48 0.30 1.6 INCOME 0.10 0.05 2.0 SEE = 0.3 R2 = 64% R2 = 63.4% F statistic = 106.7
when circuit boards used in the manufacture of compact disc players are tested the long-run percentage of defectives is
An experiment was performed to investigate lifetime of a component exposed to high heat. Three different oven types were used at either 550°F or 600°F.
Determine the mean, median, and range for each of two data sets. b. Determine standard deviation using rule of thumb for each of data sets.
The response variable is the change in cholesterol level after two months of treatment. An analysis of variance will be used to compare the three treatments. What null hypothesis is tested by this ANOVA F-test?
The manager of a service station is in the process of analyzing the number of times car owners change the oil in their cars. She believes that the average motorist changes his or her car's oil less frequently than recommended by the owner's manual (t..
The company has evidence that its line produces %0.9 of noncorforming items. What is the probability that an item selected for inspection is classified as defective?
the drying time of a certain type of paint under specified test conditions is known to have mean value 75 minutes.
the security council has 11 members with the usa russia china france and the uk as permanent members. if at a meeting
Is it reasonable to conclude the mean income of those selecting Plan B is larger? What is the p-value? Do the coefficients of skewness affect the results of the hypothesis test? Why?
An experiment is designed using three levels of ground clutter and two filter types. The experiment is performed by randomly selecting a treatment combination
x and s are equal to 3.7 and 0.5, respectively, find a 99% confidence interval for the mean pH in rainfall and interpret the interval.
Suppose that the bivariate data (x, y) represent the amount of hours per week worked by part-time employees in a small business (x) and the amount of a weekly pay check (y) issued to the employee. These records were summarized, and the summaries are ..
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