# Question

Explain why the predictor variable is useless as a predictor of the response variable if the slope of the population regression line is 0.

## Answer to relevant Questions

Consider the standardized variable a. Identify its distribution. b. Why can’t it be used as the test statistic for a hypothesis test concerning β1? c. What statistic is used? What is the distribution of that ... = 1.75 + 0.25x a. Decide, at the 10% significance level, whether the data provide sufficient evidence to conclude that x is useful for predicting y. b. Find a 90% confidence interval for the slope of the population ...Following are the data on total hours studied over 2 weeks and test score at the end of the 2 weeks from Exercise 14.21. Use α = 0.01. Presuming that the assumptions for regression inferences are met, decide at the ...The data from Exercise 14.30 for number of birdies during a tournament and final score for 63 women golfers are on the WeissStats CD. a. Decide whether you can reasonably apply the regression t-test. If so, then also do ...x = 1 a. Determine a point estimate for the conditional mean of the response variable corresponding to the specified value of the predictor variable. b. Find a 95% confidence interval for the conditional mean of the ...Post your question

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