If the population standard deviation of the stopping distance is provided as σ = 6.7 feet. Estimate the average stopping distance of all Model A tires with a 94% confidence interval.

Complete Question

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The estimate of the average stopping distance of all model A tires with a 94% confidence interval is  

Step-by-step explanation:

From the question we see that

   The sample size is  n  = 8

   The population standard deviation is  

Generally the sample mean is mathematically represented as

=>    

=>    

From the question we are told the confidence level is  95% , hence the level of significance is    

=>  

Generally the degree of freedom is mathematically represented as

=>  

=>  

Because the n < 30  we will making use of the t table

Generally from the t distribution table the critical value  of   at a  degree of freedom of  is  

Generally the margin of error is mathematically represented as  

=>    

=>    

Generally 94% confidence interval is mathematically represented as  

=>        

=>        

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.

only 10/60 isn't equivalent

hope this : )