An independent consumer group published its finding that the lifetimes of electric bulbs manufactured byBIG Corporation are approximately normally distributed with a mean of 680 days and a standard deviation of125. BIG Corporation claims that the standard deviation of its electric bulbs is less than 125. Suppose that wewant to carry out a hypothesis test to see if BIG Corporation's claim is correct. State the null hypothesis Hoand the alternative hypothesis H₁ that we would use for this test.Ho: DH₁: DнOSOOX0>0ロ=ロ 0#0РSO

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Answered: re approximately normally distributed…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

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Q1: Lifetimes of a certain component are lognormally distributed with parameters u = 1 day and o = 0.5 days. Find the mean lifetime of these components. 1-Find the standard deviation of the lifetimes. 2-Find CDF 3- Find reliability at t= 4 day
10 = You wish to test Ho: μ₁ = μ₂ versus Ha:μ₁ μ2 at a = 0.05. You obtain a sample of size ni with a mean of ₁ 73.8 and a standard deviation of s₁ = 17.5 from the first population. You obtain a sample of size n₂ 6 with a mean of 2 55.3 and a standard deviation of s2 8.7 from the second population. Assume that the populations are normal with equal variances. Do not round interim calculations. Round your final answers to three decimal places. (a). Find the test statistic: = (c). You reject (b). Using your answer from (a), find the p-value: - (d). There is sufficient second population mean o the null hypothesis. = evidence to conclude the first population mean is not equal to the
A population has parameters μ=165.4μ=165.4 and σ=11.1σ=11.1. You intend to draw a random sample of size n=198n=198.What is the mean of the distribution of sample means?μ¯x=μx¯= What is the standard deviation of the distribution of sample means?(Report answer accurate to 2 decimal places.)σ¯x=σx¯=
Question 5 of 5 -/1 View Policies Show Attempt History Current Attempt in Progress Suppose that x has a beta distribution with parameters a = 2.3 and B = 1. Determine to 4 decimal places the following: a. P(X < 0.23) i b. P(0.23 < X < 0.83) i c. Mean i d. Variance eTextbook and Media Save for Later Attempts: 0 of 3 used Submit Answer Activate Go to Settin I!
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A psychologist developed a standardized test for selecting “gifted” children. In the population, the test scores are normally distributed, with μ=75μ=75 and σ=10σ=10. We randomly sampled 49 gifted students and found out the mean test score of these 49 students is 77. Over repeated samples (with a fixed n=49n=49), what is the probability of getting a sample mean that is equal to or greater than the one we got? A. 0.42074 B. 0.91924 C. 0 D. 0.57925 E. 0.08076
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re approximately normally distributed with a mean of 680 days and a ion claims that the standard deviation of its electric bulbs is less tha a hypothesis test to see if BIG Corporation's claim is correct. State t e hypothesis H₁ that we would use for this test. μ