Problem 6. Please show steps/ equations used in excel. Thanks. Problem 5. Please

Question

Problem 6. Please show steps/ equations used in excel. Thanks.

Problem 5. Please Show New Tab https:// canvas ou.edu courses/38526/files/folder/Assignments?preview 4681032 Problem 6 An independent consumer group tested radial tires from two major brands (1, 2) to determine whether there were any differences in the expected tread life. The data (in thousands of miles) are provided in Homework 9.xlsx. a. Is mean performance difference for the two brands? Assume unequal variances. Use 90% confidence and the critical value approach. b. Is the proportion of tires that last 55,000 miles or more larger for Brand 2 tires? Use 99% confidence and the critical value approach. c. What do the results from parts a and b tell you about the two brands? Type here to search 059 PM 4/24/2017

Explanation / Answer

µ1 = 53.2; s1 = 4.32; n1 = 15

µ2 = 56.41; s2 = 6.08; n2 = 17

SE = sqrt[ (s12/n1) + (s22/n2) ] = 1.851

DF = (s12/n1 + s22/n2)2 / { [ (s12 / n1)2 / (n1 - 1) ] + [ (s22 / n2)2 / (n2 - 1) ] } ~ 17

t = [ (x1 - x2) - d ] / SE = -1.735

p-value (at t = -1.735, = 0.1) = 0.05

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