A manufacturing company developed anew type of hollow block that has amean compressive strength of 8kilograms with a standard deviation of0.5 kilogram. A random sample of 50Iblocks is tested and found to have amean compressive strength of 7.8kilograms. Use a 0.01 level ofsignificance.Which of the following best contrądictsthe null hypothesis, u = 8%3DI. µ < 8II. µ >III. ut 8).I onlyOl and IIO Il onlyO II only

Test is that whether the mean compressive strength of 8 kg.

Answered: A manufacturing company developed a new…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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We wish to estimate the mean weight of all men from a country with a 90% confidence level and a margin of error 2.6 lb. Assume that the population standard deviation is known to be 15.08 lb. A) Read carefully the text and provide each of the following: The error is E=,the population standard deviation o=,the confidence level is CL =%. B) Find the critical value za2 which is the zscore for which the right area is ?2. za2= (Hint: keep in mind that a=1−the confidence level) C) How large should the sample size be? n=
A city claims that the mean number of public transportation users per day is at least 4,800. A group of researchers think this is not accurate and want to show that the number of public transportation users is less than 4,800 Identify the null hypothesis, Ho, and the alternative hypothesis, Ha , in terms of the parameter μ. Select the correct answer below: O Ho: μ 4,800; Ha: u K 4,800 Ho: μ 4,800; Ha: μ > 4,800 Ho: μ 24,800; Ha : μ < 4,800 O O
Consider a test of Ho : u = 4. In each of the following cases, give the rejection region, assuming that the test statistics follows a standard Normal distribution. (a) H. : u > 4, a = 0.1 (b) H. : u <4, a = 0.01 (c) Ha : 4# 4, a = 0.05
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A company claims that the mean monthly residential electricity consumption in a certain region is more than 860 kiloWatt-hours (kWh). You want to test this claim. You find that a random sample of 66 residential customers has a mean monthly consumption of 900 kWh. Assume the population standard deviation is 123 kWh. At a = 0.10, can you support the claim? Complete parts (a) through (e). B. The critical value is 1.28 Identify the rejection region(s). Select the correct choice below. O A. The rejection regions are z 1.28 OB. The rejection region is z > 1.28 OC. The rejection region is z< 1.28. (c) Find the standardized test statistic. Use technology. The standardized test statistic is z = (Round to two decimal places as needed.)
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