4. Researchers working for a sports drink company would like to know if a newblend if its popular sports drink can help improve marathon runners' final runningtime. Marathon times, Y, are known to follow a Normal distribution. Suppose thatrunners using the old blend sports drink have a mean finishing time of 300 minutes(H = 300 minutes). A random sample of 20 runners was selected to use the newblend of sports drink in a marathon, finishing with an average time of 270 minutesand a standard deviation of 20 minutes (y = 270 min, s = 20 min). Can it be claimed thatthe new blend lowers finishing times? Or is it possible that random chance alone canexplain the discrepancy? Carry out a hypothesis test of the true mean u using the 4-step procedure. Set your alpha-level to 0.05.a. Which is the correct null hypothesis?O i. Ho: µ = 300 minO ii: Ho: µ = 270 min%3DO ii. Ho: µ < 300 miniv: Ho: µ < 270 min

The null hypothesis means that there is no significance exist in a set of given single observed…

Answered: 4. Researchers working for a sports…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Explain plz.
An experiment was conducted to a sample of nine gold fish and ten clown fish to determine if there is a significant difference in the average number of days that the fish can survive without food inside the aquarium. The gold fish averaged 11 days with a standard deviation of 2 days while the clown fish averaged 12 days with a standard deviation of 3 days. What is the appropriate alternative hypothesis?
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can someone please help me? I keep getting this wrong so if someone could explain that would help so much. Thanks!! the t statistic test is -3.108 by the way!
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please help asap i will upvote!!
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The breaking strengths of cables produced by a certain manufacturer have historically had a mean of 1825 pounds and a standard deviation of 70 pounds. The company believes that, due to an improvement in the manufacturing process, the mean breaking strength, μ, of the cables is now greater than 1825 pounds. To see if this is the case, 17 newly manufactured cables are randomly chosen and tested, and their mean breaking strength is found to be 1844 pounds. Assume that the population is normally distributed. Can we support, at the 0.05 level of significance, the claim that the population mean breaking strength of the newly-manufactured cables is greater than 1825 pounds? Assume that the population standard deviation has not changed. Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places, and round your responses as specified below. (If necessary, consult a list of formulas.) (a) State the null hypothesis H0…

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