a. Assume that a simple random sample has been selected from a normally distributed population. Test the claim that the mean lifetime of car engines of a particular type is greater than 220,000 miles. Sample data are summarized as n = 23, x-bar = 226,450 miles, and s = 11,500 miles. Use a significance level of alpha = 0.01. Find the test statistic. b. The typing speeds (x) (in words per minute) and reading speeds (y)(in words per minute) of nine randomly selected secretaries were recorded. Use the regression analysis provided below to predict the reading speed for a typing speed of 50 words per minute. Round your answer to the nearest word. The regression equation is y-hat = 290.2093 + 3.502052 x R-sq = 12.385% 9 - 2 = 7 degrees of freedom predictor B Std Error t sig. constant 290.2093 215.4116 1.347231 0.219884 typing speed 3.502052 3.520579 0.994737 0.352998 a. 290 words per minute b. 500 words per minute c. 465 words per minute d. 460 words per minute e. 391 words per minute
a. Assume that a simple random sample has been selected from a
b. The typing speeds (x) (in words per minute) and reading speeds (y)(in words per minute) of nine randomly selected secretaries were recorded. Use the
The regression equation is y-hat = 290.2093 + 3.502052 x
R-sq = 12.385%
9 - 2 = 7 degrees of freedom
predictor B Std Error t sig.
constant 290.2093 215.4116 1.347231 0.219884
typing speed 3.502052 3.520579 0.994737 0.352998
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