A local advocacy group is concerned about rising electricity rates and wants to estimate the average monthly
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A local advocacy group is concerned about rising electricity rates and wants to estimate the average monthly electricity bills for the residents of a major city. The group took a random sample of residents and recorded each residents electricity bill from last month. The data is recordedbelow of the Confidence Intervals. Construct a 99% confidence interval for the average monthly electricity bill for residents in the city.
- In blank #1 enter the upper limit for the confidence interval. (Round your answer to 2 decimal places and include the $ sign.)
- In blank #2 enter the lower limit for the confidence interval. (Round your answer to 2 decimal places and include the $ sign.)
- Is it reasonable for the advocacy group to claim that the average monthly electric bill is $120? Enter "yes" or "no" in blank #3.
| $90.03 | $47.07 | $31.00 | $101.56 | $93.73 | $122.30 |
| $115.98 | $131.95 | $44.67 | $100.88 | $145.63 | $142.97 |
| $178.61 | $140.94 | $17.55 | $127.86 | $15.23 | $162.77 |
| $42.41 | $154.34 | $46.40 | $161.26 | $131.65 | $129.34 |
| $171.22 | $102.88 | $130.96 | $128.92 | $120.39 | $108.50 |
| $84.32 | $114.86 | $123.01 | $164.88 | $174.61 | $178.18 |
| $94.64 | $75.17 | $153.99 | $123.15 | $140.61 | $81.38 |
| $177.60 | $129.64 | $68.21 | $82.35 | $159.37 | $112.75 |
| $100.48 | $95.78 | $85.89 | $53.94 | $83.08 | $148.70 |
| $152.76 | $146.57 | $111.32 | $131.20 | $105.17 | $154.03 |
| $136.02 | $163.28 | $117.93 | $115.00 | $66.99 | $130.40 |
| $156.16 | $183.68 | $121.26 | $133.57 | $120.11 | $87.67 |
| $114.84 | $83.17 | $73.00 | $191.84 | $139.87 | $142.46 |
| $123.72 | $101.65 | $106.54 | $135.58 | $130.13 | $64.78 |
| $120.18 | $102.37 | $181.01 | $144.94 | $124.86 | $150.20 |
| $124.85 | $120.27 | $159.75 | $140.86 | $124.48 | $131.10 |
| $36.80 | $84.54 | $70.45 | $156.25 | $103.96 | $114.09 |
| $140.84 | $130.77 | $161.47 | $94.96 | $104.20 | $154.86 |
| $110.56 | $145.78 | $186.82 | $74.62 | $109.43 | $117.50 |
| $174.68 | $73.17 | $129.98 | $84.92 | $114.49 | $125.70 |
| $74.61 | $136.90 | $111.83 | $76.68 | $167.40 | $130.44 |
| $151.94 | $149.61 | $155.80 | $131.14 | $171.02 | $118.06 |
| $84.73 | $121.57 | $187.15 | $62.00 | $98.59 | $111.38 |
| $107.38 | $145.46 | $78.28 | $126.01 | $151.23 | $128.61 |
| $50.50 | $82.84 | $56.91 | $168.18 | $121.38 | $105.36 |
| $66.35 | $42.53 | $80.11 | $123.70 | $120.96 | $93.17 |
| $111.99 | $82.71 | $121.75 | $94.61 | $107.23 | $118.89 |
| $76.24 | $124.38 | $151.92 | $132.40 | $120.63 | $147.48 |
| $121.95 | $152.21 | $142.53 | $77.58 | $154.04 | $80.18 |
| $125.90 | $102.66 | $137.09 | $133.57 | $136.80 | $105.88 |
| $110.79 | $115.52 | $107.96 | $50.57 | $136.26 | $117.56 |
| $122.12 | $85.84 | $110.35 | $130.28 | $152.32 | $202.92 |
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