A home building company routinely orders standard interior doors with a height of 80 inches.Recently the installers have complained that the doors are not the standard height.The quality control inspector for the home building company is concerned that the manufacturer is supplying doors that are not 80 inches in height.In an effort to test this, the inspector is going to gather a sample of the recently received doors and measure the height.The alternative hypothesis for the statistical test to determine if the doors are not 80 inches is __________. A)the mean height is 80 inches B)the mean height is

Question

A home building company routinely orders standard interior doors with a height of 80 inches.Recently the installers have complained that the doors are not the standard height.The quality control inspector for the home building company is concerned that the manufacturer is supplying doors that are not 80 inches in height.In an effort to test this, the inspector is going to gather a sample of the recently received doors and measure the height.The alternative hypothesis for the statistical test to determine if the doors are not 80 inches is __________.
A)the mean height is > 80 inches
B)the mean height is < 80 inches
C)the mean height is = 80 inches
D)the mean height is ≠ 80 inches
E)the mean height is ≥ 80 inches

Quizplus · Accepted Answer

The alternative hypothesis is designed to test for a difference from the standard height, which includes both possibilities of the doors being taller or shorter than 80 inches. Therefore, the correct alternative hypothesis is that the mean height is not equal to 80 inches.

A Home Building Company Routinely Orders Standard Interior Doors with a Height