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?
A) Reject the null hypothesis.
B) Fail to reject the null hypothesis.

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? 
A) Reject the null hypothesis. 
B) Fail to reject the null hypothesis.

Quizplus · Accepted Answer

Do not reject H₀. No significant difference. 11ead627_0a03_c8ac_93a1_c753fccf21ea_TB7056_00 T_A = 43.5 T_B = 95 T_C = 51.5= 5.99 H = −3(19 + 1) H = 4.633 4.633 < 5.99, failed to reject H₀. There is no significant difference in repair and replacement costs among the three brands of heating and air-conditioning units.

Three Years Ago, a Major Hotel Chain Purchased a Large