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A regression analysis of data from some of our statistics classes yielded the following regression equation for the independent variable, hours studied, and the dependent variable, grade point average (GPA): Y^ = 2.96 + 0.02(X).
a. If you plan to study 8 hours per week, what would you predict for your GPA?
b. If you plan to study 10 hours per week, what would you predict for your GPA?
c. If you plan to study 11 hours per week, what would you predict for your GPA?
d. Create a graph and draw the regression line based on these three pairs of scores.
e. Do some algebra, and determine the number of hours you'd have to study to have a predicted GPA of the maximum possible, 4.0. Why is it misleading to make predictions for anyone who plans to study this many hours (or more)?+
Find a function of Y that is an unbiased estimator of V(Y). Suggest how to form a 2-standard-error bound on the error of estimation when Y is used to estimate 1/p.
if a researcher is using a paired-sample sign test and has 4 positive signs 8 negative signs and 3 zeros what is the
a confidence interval with a 95 confidence level for the proportion of voters who are in favor of the proposition in a
Use this sample information to develop a 99% confidence interval for the population proportion of women who wear flats to work.
In order to control costs, a company wishes to study the amount of money its sales force spends entertaining clients. Compute and interpret the Z score for each of the six entertainment expenses.
Find out 90% confidence interval for mean grade of all the students in the class.
Only 15% of all these washing machines last at least 5 years.- What is the standard deviation of the lifetime of a washing machine made by this manufacturer?
question 1a busy landscaping supplies company sells wood chips for garden mulch. the mulch is sold by the cubic metre
1. Getting angry at other drivers. Refer to Exercise 8.14. The same Pew Poll found that 38% of the respondents "shouted, cursed or made gestures to other drivers" in the last year.
Remember that a resistant statistic is a numerical summary whose value is not unduly influenced by an outlier of any magnitude. Is the standard deviation a resistant statistic?
A foreman for a firm admits that on 10% of his shifts he forgets to shut off the machine. This causes the machine to overheat and the probability that a defective mold will be produced during the early morning run increases from 2% to 20%.
a special diet is intended to reduce the cholesterol of patients at risk of heart disease. if the diet is effective the
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