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A sample of 40 golfers showed that their average on a particular course was 94 with a standard deviation of 6.
a. Find the 95% confidence interval of the mean score for all golfers.
b. Find the 95% confidence interval of the mean score for all golfers if a sample of 70 golfers is used instead of a sample of 40.
c. Which interval is smaller? Explain why.
A company determines that the profit (P) in Pula and the advertising expenditure (e) in Pula have a linear relationship. a) Find an equation of linear relationship
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Consider a multiple regression model Y=ß0+ß1X1+ß2X2+µ The sample data yields the following matrices: X’X= { ¦(33&0&0@0&40&0@0&20&60) } Y’X=¦((132&24&92)) ?(y-Y)2 =150 a. what
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A scientist claims that the mean incubation period for the eggs of a species of birds is more than 46 days.
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