The breaking strengths of cables produced by a certain company are approximately normally distributed. The company announced that the mean breaking strength is 2200 pounds. with a standard deviation of 183.5. A consumer protection agency claims that the actual standard deviation is higher. Suppose that the consumer agency wants to carry out a hypothesis test to see if its claim can be supported. State the null hypothesis H, and the alternative hypothesis H, they would use for this test. H, :0 O

The breaking strengths of cables produced by a certain company are approximately normally distributed. The company announced that the mean breaking strength is 2200 pounds. with a standard deviation of 183.5. A consumer protection agency claims that the actual standard deviation is higher. Suppose that the consumer agency wants to carry out a hypothesis test to see if its claim can be supported. State the null hypothesis H, and the alternative hypothesis H, they would use for this test. H, :0 O

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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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A manufacturer claims that the light bulbs that they produce have a mean lifetime of 1,200 hours and standard deviation of 400 hours. A random sample of size 50 is selected and the sample mean, , is calculated. Let the sample mean, .be an estimator of the population mean H. Which of the following statements are true? Select one or more: O a. The distribution of is approximately normal Ob. X is an unbiased estimator of u O c. The variance of is o?/n. where g? is the population variance and n is the sample size. Od. K is a consistent estimator of
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Answer 2, 3, and 4