Mathematics, 28.11.2019 06:31 colin774
The average number of pages for a simple random sample of 40 physics textbooks is 435. the average number of pages for a simple random sample of 40 mathematics textbooks is 410. assume that all page length for each types of textbooks is normally distributed. the standard deviation of page length for all physics textbooks is known to be 100, and the standard deviation of page length for all mathematics textbooks is known to be 100.assuming that on average, mathematics textbooks and physics textbooks have the same number of pages, what is the probability of picking samples of these sizes and getting a sample mean so much higher for the physics textbooks (one-sided p-value, to four places)?
Answers: 3
Mathematics, 21.06.2019 20:20
Recall that the owner of a local health food store recently started a new ad campaign to attract more business and wants to know if average daily sales have increased. historically average daily sales were approximately $2,700. the upper bound of the 95% range of likely sample means for this one-sided test is approximately $2,843.44. if the owner took a random sample of forty-five days and found that daily average sales were now $2,984, what can she conclude at the 95% confidence level?
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Mathematics, 21.06.2019 23:00
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Mathematics, 22.06.2019 02:00
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The average number of pages for a simple random sample of 40 physics textbooks is 435. the average n...
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