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You run a regression analysis on a bivariate set of data (n=50). You obtain the regression equation
y=-3.365x +- 54.483y
with a correlation coefficient of r = -0.5 (which is significant at α=0.01). You want to predict what value (on average) for the explanatory variable will give you a value of 30 on the response variable.
What is the predicted explanatory value?
x = _______________________________
(Report answer accurate to one decimal place.)
Use the steps of hypothesis testing. (b) Sketch the distributions involved. (c) Explain your answer to someone who has never taken a course in statistics.
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What is the probability that the mean height for the sample is greater than 65 ?inches? Assume sigma s=2.97
In a sample of 500 college students aged 18 to 21, it was found that offering discount coupons for restaurant meals substantially increased the likelihood.
What sample size must you take to be 96% confident that the results will be within $.75 of the true mean cost per call?
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