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derivation of the answers. Thank you!
Q3) 2 points The average height...
Historically, the average height of females in the freshman class of a certain college has been...
Historically, the average height of females in the freshman class of a certain college has been 162.5 centimeters. Is there reason to believe that there has been a change in the average height if a random sample of 50 females in the present freshman class has an average height of 165.2 centimeters, with a standard deviation of 6.9 centimeters? Assume the level of significance equals 0.05 and that height is normally distributed. What is/are the critical value(s) for this hypothesis...
The average height of females in a population of a certain college has been 162 centimeters...
The average height of females in a population of a certain college has been 162 centimeters with a population standard deviation of 7 centimeters. Is there a reason to believe that there has been a change in the average height if a random sample of 49 females in the present freshman class has an average height of 166 centimeters? Use a 0.01 level of significance. Answer each part separately. PART A: Is this a z test or t test? *...
Please write the full derivation of the answers. Thank you! Q4) 2 points A researcher in...
Please write the full
derivation of the answers. Thank you!
Q4) 2 points A researcher in the University of Toronto claims that the average life span of mice can be extended by as much as 8 months when the calories in their diet are reduced by approximately 40% from the time they are weaned. The restricted diets are enriched to normal levels by vitamins and protein. Suppose that a random sample of 10 mice is fed a normal diet and...
Please provide a full derivation of the answers. Thank you! 27) 2 points At engineering faculty,...
Please provide a full
derivation of the answers. Thank you!
27) 2 points At engineering faculty, it is estimated that at most 25% of the students ride bicycles to class. Does this seem to be a valid estimate if, in a random sample of 90 college students, 28 are found to ride bicycles to class? Use a 0.05 level of significance.
Please write the full derivation of the answers. Thank you! Q2) 1 Point for part a,...
Please write the full
derivation of the answers. Thank you!
Q2) 1 Point for part a, 1 point for part b; total 2 points A company has developed a new fishing line, which the company claims has a mean breaking strength of 15 kilograms with a standard deviation of 0.5 kilogram. To test the hypothesis that u = 15 kilograms against the alternative that u < 15 kilograms, a random sample of 50 lines will be tested. The critical region...
Please write the full derivation of the answers. Thank you! Q5) 2 points Engineers at a...
Please write the full
derivation of the answers. Thank you!
Q5) 2 points Engineers at a large automobile manufacturing company are trying to decide whether to purchase brand A or brand B tires for the company's new models. To help them arrive at a decision, an experiment is conducted using 12 of each brand. The tires are run until they wear out. The results are as follows: Brand A: = 37,900 kilometers, S1 = 5100 kilometers. Brand B: 12 =...
Please write the full derivation of the answers. Thank you! Q6) 2 points For testing Ho:...
Please write the full
derivation of the answers. Thank you!
Q6) 2 points For testing Ho: u = 14, H:H # 14, an a = 0.05 level t-test is being considered. What sample size is necessary in order for the probability to be 0.1 of falsely failing to reject H, when the true population mean differs from 14 by 0.5? From a preliminary sample we estimate o to be 1.25.
Please write the full derivation of the answers. Thank you! Q1) 1 Point for part a,...
Please write the full
derivation of the answers. Thank you!
Q1) 1 Point for part a, 1 point for part b; total 2 points In a research survey in a certain city, a sample of 400 voters are asked if they favor an additional 4% gasoline sales tax to provide badly needed revenues for street repairs. If more than 220 but fewer than 260 favor the sales tax, we shall conclude that 60% of the voters are for it. a)...
Please show all work (using a t-test), thank you. 2. You are the manager of a...
Please show all work (using a t-test), thank you.
2. You are the manager of a restaurant that delivers pizza to college dormitory rooms. You have just changed your delivery process in an effort to reduce the mean time between the order and the completion of delivery from the current 25 minutes. A sample of 36 orders using the new delivery process yields a sample mean of 22.4 minutes and a sample standard deviation of 6 minutes. What are the...
Please help ASAP please. Let X represent the full height of a certain species of tree....
Please help ASAP please.
Let X represent the full height of a certain species of tree. Assume that X has a normal probability distribution with mean 219.5 ft and standard deviation 62.5 ft You intend to measure a random sample of n 187 trees. The bell curve below represents the distibution of these sample means. The scale on the horizontal axis is the standard error of the sampling distribution Complete the indicated boxes, correct to two decimal places Points possible:...
The average height of females in a population of a certain college has been 162 centimeters with a population standard deviation of 7 centimeters. Is there a reason to believe that there has been a change in the average height if a random sample of 49 females in the present freshman class has an average height of 166 centimeters? Use a 0.01 level of significance. Answer each part separately. PART A: Is this a z test or t test? *...
Please write the full
derivation of the answers. Thank you!
Q4) 2 points A researcher in the University of Toronto claims that the average life span of mice can be extended by as much as 8 months when the calories in their diet are reduced by approximately 40% from the time they are weaned. The restricted diets are enriched to normal levels by vitamins and protein. Suppose that a random sample of 10 mice is fed a normal diet and...
Please provide a full
derivation of the answers. Thank you!
27) 2 points At engineering faculty, it is estimated that at most 25% of the students ride bicycles to class. Does this seem to be a valid estimate if, in a random sample of 90 college students, 28 are found to ride bicycles to class? Use a 0.05 level of significance.
Please write the full
derivation of the answers. Thank you!
Q2) 1 Point for part a, 1 point for part b; total 2 points A company has developed a new fishing line, which the company claims has a mean breaking strength of 15 kilograms with a standard deviation of 0.5 kilogram. To test the hypothesis that u = 15 kilograms against the alternative that u < 15 kilograms, a random sample of 50 lines will be tested. The critical region...
Please write the full
derivation of the answers. Thank you!
Q5) 2 points Engineers at a large automobile manufacturing company are trying to decide whether to purchase brand A or brand B tires for the company's new models. To help them arrive at a decision, an experiment is conducted using 12 of each brand. The tires are run until they wear out. The results are as follows: Brand A: = 37,900 kilometers, S1 = 5100 kilometers. Brand B: 12 =...
Please write the full
derivation of the answers. Thank you!
Q6) 2 points For testing Ho: u = 14, H:H # 14, an a = 0.05 level t-test is being considered. What sample size is necessary in order for the probability to be 0.1 of falsely failing to reject H, when the true population mean differs from 14 by 0.5? From a preliminary sample we estimate o to be 1.25.
Please write the full
derivation of the answers. Thank you!
Q1) 1 Point for part a, 1 point for part b; total 2 points In a research survey in a certain city, a sample of 400 voters are asked if they favor an additional 4% gasoline sales tax to provide badly needed revenues for street repairs. If more than 220 but fewer than 260 favor the sales tax, we shall conclude that 60% of the voters are for it. a)...
Please show all work (using a t-test), thank you.
2. You are the manager of a restaurant that delivers pizza to college dormitory rooms. You have just changed your delivery process in an effort to reduce the mean time between the order and the completion of delivery from the current 25 minutes. A sample of 36 orders using the new delivery process yields a sample mean of 22.4 minutes and a sample standard deviation of 6 minutes. What are the...
Please help ASAP please.
Let X represent the full height of a certain species of tree. Assume that X has a normal probability distribution with mean 219.5 ft and standard deviation 62.5 ft You intend to measure a random sample of n 187 trees. The bell curve below represents the distibution of these sample means. The scale on the horizontal axis is the standard error of the sampling distribution Complete the indicated boxes, correct to two decimal places Points possible:...
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