The manufacturer of a new model car (Camry) claims that a typical car gets 26 miles per gallon. A consumer advocacy group is skeptical of this claim and thinks that the mean gas mileage, of all Camrys may be less than 26 mpg. The group plans to perform the hypothesis test at sigma = 0.05, using a sample of 30 Camrys.H​0​: u=26 mpg ​H​a: u<26 mpg. Find the probability of making a Type II error if the true mean mpg of all Camrys is 25.8 mpg. Assume that gas mileages of Camrys are normally distributed with a standard deviation of 1.4 mpg.

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A: The hypothesized mean is 4.86.

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A:

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Q: the area representing P (Y <3) D -3 -2 -1 0 2 3

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Q: sample 1 (M cars) : n1 = 24, X ̄1 = 29.8, s1 = 2.56 sample 2 (J cars) : n2 = 28, X ̄2 = 27.3, s2 =…

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Q: We have Ho : p = .4 and H1: p > .4. You run 50 experiments and find that the sample proportion is…

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Q: Scores on an IQ test are normally distributed. A sample of 18 IQ scores had standard deviation s =…

A: Confidence interval: The (1-α) % confidence interval for population variance is given by: