Northwest Real Estate manages more than five hundred residential apartments in the Pacific Northwest. The company wants to understand if there is a significant difference among the average heating bills of all apartments in the city using three forms of heating (Natural Gas, Central Electric, Heat Pump). In a recent study, heating bills for a selected sample of apartments in a city using various forms of heating are recorded (in $1000). Data set below.

Natural Gas	Central Electric	Heat Pump
84	95	85
64	60	93
93	89	90
85	85	92
77	91	90
88	96	92
71	90	80

Part A: Specify the null and alternative hypotheses.

Part B: What is the conclusion at 5% significance level? Also provide a complete interpretation of the result (i.e., what the result means in the context of the problem).