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of 18 and s25. Test nough evidence infer that the on the package. A random sample ers whose packaging states that the contents weigh 8 ounces was drawn. The contents were weighed and the results follow. Can we conclude at the 1% significance level that on average the containers are know that the mislabeled? produced in tical. with α .05 = 1,000. 7.80 7.91 7.93 7.99 7.94 7.75 7.97 7.95 7.79 8.06 7.82 7.89 7.92 7.87 7.92 7.98 8.05 7.91 12.27 Xr12:27 A parking control officer is conducting an analysis of the amount of time left on parking meters. A quick survey of 15 cars that have just lefttheir metered parking spaces produce ing times (in minutes). Estimate with 95% the mean amount of time left for all the citys confi- dence meters 15 1 14 0 9 17 31 8 26 23 15 33 28 20

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math   Statistics-And-Probability   
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14.95137 9.817569 293.55 17.08417 328.8166 83.41717 1.284369 165.552 0.017769 61 ,88497 23.68477 9.817569 221.0188 97.35177 3.484569 1331.733 15 14 17 26 23 15 28 20 272 22 -18.1333 15 Standard deviation-lcxAY- 11331733 n-1 15-1Calculated mean -18.1333, sd(s) -9.7531,n-15 df n-1-15-1-14 C-0.95 a 1-0.95-0.05 t- %2df-to 025,14-2.145 (using t value table at df14) 95% confidence interval Margin of error (E)-4.2. 145 erm=5.4016 18.1333-5.4016-12.731 Upper limitxE 18.1333+5.4016-23.5349 95% confidence interval is (12.7317-23.5349 Using excel the answer is -18.1333 (TINV(0.05, 15)*9.7531/sqrt (15) -(12.7322133 ,23.5343867)

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