Jessica Salas, President of Salas Products, is reviewing the warranty policy for her company's new model of automobile batteries. Lifetests performed on a sample of 100 batteries indicated: (1) an average life of 75 months, (2) a standard deviation of 5 months, and (3) abell-shaped battery life distribution. Approximately 68% of the batteries will last between _____.70 and 80 months60 and 90 months55 and 95 months65 and 85 monthsO 60 and 100 months

It is given that Mean, μ = 75Standard deviation, σ = 5

Answered: tests performed on a sample of 100…

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 sample of birth weights of 38 girls was taken. Below are the results (in g): 4002.7 3558.2 31 3104.4 3405.2 3094.4 3145.7 2903.5 3641.1 3530.4 2348.2 3027.4 3542.7 2151.5 3583.6 3280.3 4072.1 2989.5 3595.1 2444.4 3537.2 1969 3720.5 3440.5 3395.8 3323.1 3475.6 3159.5 3099.8 3070.7 2838.1 2997.8 2584 2577 2850.5 2995.6 2940.9 3845.8 3173.6 (Note: The average and the standard deviation of the data are respectively 3168.8 g and 480.8 g.) Use a 1% significance level to test the claim that the standard deviation of birthweights of girls is less than the standard deviation of birthweights of boys, which is 510 g. Procedure: Select an answer Assumptions: (select everything that applies) Population standard deviation is unknown The number of positive and negative responses are both greater than 10 O Population standard deviation is known Normal population Sample size is greater than 30 Simple random sample
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tests performed on a sample of 100 batteries indicated: (1) an average life of 75 months, (2) a standard bell-shaped battery life distribution. Approximately 68% of the batteries will last between 70 and 80 months O 60 and 90 months O 55 and 95 months 65 and 85 months 60 and 100 months