The manufacturer of a particular brand of tires claims they average at least 50,000 miles before needing to be replaced. From past studies of this tire, it is known that the population standard deviation is 8,000 miles. A survey of tire owners was conducted. From the 21 tires surveyed, the mean lifespan was 41500 miles. Using alpha = 0.05, can we prove that the data in inconsistent with the manufacturers claim?

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A: We first find the critical value for 95% confidence interval

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A: As per Bartleby guideline expert have to answer first three subparts only dear student please upload…

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A: As per our guidelines we can solve first three sub part of question and rest can be reposted.…

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A: As per guideline éxpert have to answer first 3 subparts only.

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A: Given,sample size(n)=43sample mean(x¯)=15.2standard deviation(s)=3.16α=0.01

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A: Given,   Mean = 736 Standard deviation = 10

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A:

Q: It takes an average of 11.2 minutes for blood to begin clotting after an injury. average will…

A: Note: As per the guidelines, we are only allowed to solve three subparts, please post the other…

Q: It takes an average of 8.8 minutes for blood to begin clotting after an injury. An EMT wants to see…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

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A: Given Information :  It takes an average of 8.2 minutes for blood to begin clotting after an injury.…

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A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are…

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A:

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Q: It takes an average of 10.4 minutes for blood to begin clotting after an injury. An EMT wants to see…

A: Givensample size(n)=67Mean(x)=10.8standard deviation(s)=2.94α=0.05claim is to see if the average…

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A:

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A: From part (c) we have test statistic t = 2.072

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A: Given data μ = 565σ = 100normal distribution P(493<x<681) = ?

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A: The level of significance is 0.01.

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A: Given data,μ=767σ=39P(X>x)=0.11x=?

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A: The sample size n is 40.

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A: According to policy we supposed to answer only first three part for remaining please repost the…

Q: The heights of two year old females is approximately normally distributed with a mean of 33.7 inches…

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Q: It takes an average of 14.6 minutes for blood to begin clotting after an injury. An EMT wants to see…

A: