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Author Question: A researcher is investigating which of two newly developed automobile engine oils is better at ... (Read 81 times)

crazycityslicker

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on: Feb 14, 2020

Question 1

Which supermarket has the lowest prices in town? All claim to be cheaper, but an independent agency recently was asked to investigate this question. The agency randomly selected 100 items common to each of two supermarkets (labeled A and B) and recorded the prices charged by each supermarket. The summary results are provided below:

    A = 2.09     B = 1.99       = .10
    sA = 0.22     sB = 0.19     sd = .03

Assuming the data represent a matched pairs design, calculate the confidence interval for comparing mean prices using a 95% confidence level.
◦ .10 ± .004935
◦ .10 ± .1255
◦ .10 ± .00588
◦ .10 ± .056975

Question 2

A researcher is investigating which of two newly developed automobile engine oils is better at prolonging the life of an engine. Since there are a variety of automobile engines, 20 different engine types were randomly selected and were tested using each of the two engine oils. The number of hours of continuous use before engine breakdown was recorded for each engine oil. Suppose the following 95% confidence interval for μA - μB was calculated: (100, 2500). Which of the following inferences is correct?
◦ We are 95% confident that no significant differences exists in the mean number of hours of continuous use before breakdown of engines using oils A and B.
◦ We are 95% confident that an engine using oil B has a higher mean number of hours of continuous use before breakdown than does an engine using oil A.
◦ We are 95% confident that an engine using oil A has a higher mean number of hours of continuous use before breakdown than does an engine using oil B.
◦ We are 95% confident that the mean number of hours of continuous use of an engine using oil A is between 100 and 2500 hours.
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Marked as best answer by crazycityslicker on Feb 14, 2020

soda0602

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Reply #1 on: Feb 14, 2020
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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crazycityslicker

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Reply 2 on: Feb 14, 2020
Great answer, keep it coming :)

31809pancho

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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