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The following ANOVA summary data are the result of a regression with sales per year (dependent variable) as a function of promotion expenditures per year (independent variable) for a toy company.
F = ?MSA = 34,276MSE = 4,721
The degrees of freedom are 1 for the numerator and 19 for the denominator. Is the relationship statistically significant at alpha= 05? Comment on your answer.
Interpret values of b1, b2, b3 and b4 in this estimated regression equation.
A manufacturing process produces items whose weights are basically distributed. It is known that 22.57% of all the items produced, weigh between 100 grams up to the mean and 49.18% weigh from the mean up to 190 grams.
Formulate a suitable null and alternative hypothesis to test the students' claim that they followed their instructor's recommendation at a 5% level of significance and interpret your findings.
Multiple choice questions based on F-distribution.
Develop three regression models to predict the selling price based upon each of the other factors individually. Which of these is best?
Compute the 95% confidence interval for the proportion of adults who are planning to buy a new car in the next 6 months.
Can we conclude there is a difference in mean number of surgeries performed by hospital or by day of week?
A bank's loan officer rates applicants for credit. The ratings are normally distributed with a mean of 175 and a standard deviation of 15. If an applicant is randomly selected, find the probability of a rating that is between 150 and 200.
Consider following data on exam scores of 10 randomly selected students: Compute 3rd quartile of the exam scores.
Determine the upper and lower control chart limit and the lower control chart limit for various values of the fraction defective (p) in the sample taken. Assume a 99.7 % confidence.
Assume that demand for the upcoming weekend is normally distributed with a standard deviation of 30.
At 1 excavation site 8641 pot shards have been found that have not presently been cleaned also identified. Define the probability.
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