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)?

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general 9 months ago 4491

A company claims that the mean monthly residential electricity consumption in a certain region is more than 870 kWh. You want to test this claim. You find that a random sample of 67 residential customers has a mean monthly consumption of 910 kWh. Assume the population standard deviation is 127 kWh. At ?=0.10, can you support the claim? Complete parts (a) through (e).(a) IdentifyUpper H 0H0andUpper H Subscript aHa.(b) Find the critical? value(s) and identify the rejection? region(c) Find the standardized test statistic. Use technology.(d) Decide whether to reject or fail to reject the null hypothesis.

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general 9 months ago 1367

A company that manufactures small canoes has a fixed cost of $20,000. It cost $40 to produce each canoe. The selling price is $80 per canoe. (In solving this exercise, let x represent the number of canoes produced and sold.) 1. Write the cost function. 2. Write the revenue function. 3. Determine the break-even point. Make sure your answer is an ordered pair.4. This means that when the company produces and sells the break-even number of canoes: a. there is less money coming in than going out b. the money coming in equals the money going out c. there is more money coming in than going out d. there is not enough informationPlease explain how to work all of this out.

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general 9 months ago 7086

(1 point) The effectiveness of a new bug repellent is tested on 18 subjects for a 10 hour period. Based on the number and location of the bug bites, the percentage of exposed surface area protected from bites was calculated for each of the subjects. Assume the population is normally distributed. The results were as follows: x¯¯¯=92 %, s=8% The new repellent is considered effective if it provides a percent repellency of more than 89%. Using α=0.025, construct a hypothesis test with null hypothesis μ≤0.89 and alternative hypothesis μ>0.89 to determine whether the mean repellency of the new bug repellent is greater than 89% by computing the following: (a)The degree of freedom is df= .

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general 9 months ago 5821