The values of heating degree days, as listed in Data Set 12 in Appendix B.

Refer to the indicated data set and determine whether the data have a normal distribution. Assume that this requirement is loose in the sense that the population distribution need not be exactly normal, but it must be a distribution that is roughly bell-shaped.

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Data Set 12: Electricity Consumption of a Home All measurements are from the author's home. STATDISK: Data set name is Electric. Minitab: Worksheet name is ELECTRIC.MTW. Excel: Workbook name is ELECTRIC.XLS. TI-83/84 Plus: App name is ELECTRIC and the file names are the same as for text files. Text file names: Text file names are KWH, COST, HDD, ADT. Electricity Consumed Heating Degree Days Average Daily Temp (°F) Time Period (kWh) Cost (dollars) Year 1: Jan/Feb Year 1: March/Apr Year 1: May/June Year 1: July/Aug Year 1: Sept/Oct Year 1: Nov/Dec Year 2: Jan/Feb Year 2: March/Apr Year 2: May/June Year 2: July/Aug Year 2: Sept/Oct Year 2: Nov/Dec Year 3: Jan/Feb Year 3: March/Apr Year 3: May/June Year 3: July/Aug Year 3: Sept/Oct Year 3: Nov/Dec Year 4: Jan/Feb Year 4: March/Apr Year 4: May/June Year 4: July/Aug Year 4: Sept/Oct Year 4: Nov/Dec Year 5: Jan/Feb Year 5: March/Apr Year 5: May/June Year 5: July/Aug Year 5: Sept/Oct Year 5: Nov/Dec Year 6: Jan/Feb Year 6: March/Apr Year 6: May/June Year 6: July/Aug Year 6: Sept/Oct Year 6: Nov/Dec Year 7: Jan/Feb Year 7: March/Apr Year 7: May/June Year 7: July/Aug Year 7: Sept/Oct Year 7: Nov/Dec Year 8: Jan/Feb Year 8: March/Apr Year 8: May/June Year 8: July/Aug Year 8: Sept/Oct Year 8: Nov/Dec 295.33 2226 1616 479 19 184 1105 2351 3637 29 2888 230.08 37 57 74 2359 213.43 338.16 3704 3432 299.76 66 2446 4463 214.44 384.13 47 28 295.82 255.85 2482 1508 657 41 2762 54 2288 219.72 35 68 308 1257 2423 256.59 62 2483 3375 276.13 321.94 221.11 205.16 42 26 2421 2661 1841 34 2073 438 58 2579 2858 251.07 279.80 15 152 1028 1967 72 67 2296 183.84 48 2812 2433 2266 3128 3286 244.93 218.59 213.09 333.49 370.35 33 1627 39 537 66 26 116 71 2749 222.79 1457 3427 316.18 253 1811 578 77.39 3792 385.44 334.72 632 3348 2937 2774 330.47 237.00 35 215 1300 2435 3016 303.78 2458 2395 263.75 207.08 1540 395 3249 3003 304.83 26 305.67 153 1095 2118 4261 1946 2063 4081 197.65 470.02 2554 217.36 217.08 1708 569 3 58 541.01 1919 2360 423.17 256.06 1232 2853 2174 309.40 254.91 2070 1620 2370 290.98 370.74 542 3480 29 228 2710 329.72 2327 229.05 1053