76 846
Assignments Done
Successfully Done
In June 2019

Answer to Question #19901 in Statistics and Probability for john

Question #19901
In a recent sample of 84 used cars sales cost, the sample mean was $6425 with a standard deviation of $3156. Assume the underlying distribution is approximately normal. Construct a 95 % confidence interval for the population average cost of a used car
Expert's answer
to find confidence interval we need
standard deviation/ sqrt (sample size) = 3156/sqrt(84) = 344,3
finding the coefficient from t-distr. table and multiplying on previous number we get
344.3*(1.96) = 674.8
hence, confidence interval is $6425 +- $674.8

Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!


No comments. Be first!

Leave a comment

Ask Your question

Privacy policy Terms and Conditions