The Dodge Reports are used by many companies in the construction field to estimate the time required to complete various jobs. The company managers want to know ifthe time required to install 130 square feet of bathroom tile is different from the nine hours reported in the current manual. A researcher for Dodge randomly selects 55construction workers and determines the time required to install 130 square feet of bath tile. The average time required to install the tile for the sample is 10.3 hourswith a standard deviation of 4.2 hours. Use a hypothesis test to determine whether the managers' assumptions are substantiated by the data. Use a significance level ofa = 0.05. Assume the population of tile installation times is approximately normally distributed.Step 3 of 3: Draw a conclusion and interpret the decision.

We have given thatGiven sample mean (x̄) = 10.3 hoursPopulation mean (μ) = 9 hoursSample standard…

Answered: The Dodge Reports are used by many…

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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Ivanna recently switched her primary doctor to one specializing in caring for elderly patients. On her new doctor's website, it says that the mean systolic blood pressure among elderly females is 120 millimeters of mercury (mmHg). Ivanna believes the value is actually higher. She bases her belief on a recently reported study of 18 randomly selected, elderly females. The sample mean systolic blood pressure was 125 mmHg, and the sample standard deviation was 22 mmHg. Assume that the systolic blood pressures of elderly females are approximately normally distributed. Based on the study, at the 0.05 level of significance, can it be concluded that μ, the population mean systolic blood pressure among elderly females, is greater than 120 mmHg? Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places. (If necessary, consult a list of formulas.) (a) State the null hypothesis Ho and the alternative hypothesis H₁. 0 Ho ! H₁ (b)…
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