Three Years Ago,a Major Hotel Chain Purchased a Large Number

Three years ago,a major hotel chain purchased a large number of heating and air-conditioning units from three major manufacturers,A,B and

A) Reject the null hypothesis
B) Fail to reject the null hypothesis
C) The accounting department of the hotel chain kept records on their repair and replacement costs over the last 3 years.The manager of the purchasing department randomly selected 6 brand A,7 brand B,and 6 brand C heating and air-conditioning unit records.The repair and replacement costs in dollars are summarized in the following table.At