Question

Three years ago, a major hotel chain purchased a large number of heating and air-conditioning units from three major manufacturers, A, B, and C. The accounting department of the hotel chain kept records on their repair and replacement costs over the last three years. The manager of the purchasing department randomly selected six brand A, seven brand B, and six brand C heating and air-conditioning unit records. The repair and replacement costs in dollars are summarized in the following table. At α = .05, can we conclude that there is a significant difference in repair costs among the three brands?

Brand A			Brand B			Brand C
$	80		$	100		$	140
$	250		$	170		$	280
$	150		$	430		$	100
$	70		$	290		$	100
$	220		$	370		$	340
$	300		$	420		$	250
			$	350

A) Reject the null hypothesis.

B) Fail to reject the null hypothesis.

Answer 1