Six analysts each made six determinations of the paracetamol content of the same batch of tablets. The results are shown below: Analyst Paracetamol content (% m/m) 84 32 84 51 84 63 84 61 84 64 84 5
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- Find the mean hourly cost when the cell phone described above is used for 240 minutes.The sodium content of twenty 300-gram boxes of organic cornflakes was determined. The data (in milligrams) are as follows: 131.15, 130.69, 130.91, 129.54, 129.64, 128.77, 130.72, 128.33, 128.24, 129.65, 130.14, 129.29, 128.71, 129.00, 129.39, 130.42, 129.53, 130.12, 129.78, 130.92. Can you support a claim that mean sodium content of this brand of cornflakes differs from 130 milligrams? Use a = 0.05. Indicate the appropriate hypotheses test. a. Test on Mean, Variance Unknown O b. Test on Variance and Standard Deviation c. Test on Population Proportion d. Test on Mean, Variance KnownThe sodium content of twenty 300-gram boxes of organic cornflakes was determined. The data (in milligrams) are as follows: 131.15, 130.69, 130.91, 129.54, 129.64, 128.77, 130.72, 128.33, 128.24, 129.65, 130.14, 129.29, 128.71, 129.00, 129.39, 130.42, 129.53, 130.12, 129.78, 130.92. Can you support a claim that mean sodium content of this brand of cornflakes differs from 130 milligrams? Use a = 0.05. Indicate the appropriate hypotheses test. а. Test on Population Proportion O b. Test on Mean, Variance Known O c. Test on Mean, Variance Unknown O d. Test on Variance and Standard Deviation
- Periodically, the county Water Department tests the drinking water of homeowners for contminants such as lead and copper. The lead and copper levels in water specimens collected in 1998 for a sample of 10 residents of a subdevelopement of the county are shown below. lead (?μg/L) copper (mg/L) 3.33.3 0.6280.628 3.33.3 0.2930.293 0.30.3 0.7830.783 4.74.7 0.1950.195 55 0.3780.378 1.41.4 0.2330.233 0.90.9 0.1010.101 0.90.9 0.6980.698 3.63.6 0.80.8 1.21.2 0.7610.761 (a) Construct a 99% confidence interval for the mean lead level in water specimans of the subdevelopment. _____≤μ≤_____ (b) Construct a 99% confidence interval for the mean copper level in water specimans of the subdevelopment. ______≤μ≤______Periodically, the county Water Department tests the drinking water of homeowners for contminants such as lead and copper. The lead and copper levels in water specimens collected in 1998 for a sample of 10 residents of a subdevelopement of the county are shown below. lead (μμg/L) copper (mg/L) 4.44.4 0.4840.484 2.72.7 0.0760.076 5.35.3 0.5950.595 3.33.3 0.1280.128 5.55.5 0.4690.469 1.71.7 0.4060.406 0.40.4 0.8480.848 0.70.7 0.0220.022 44 0.860.86 2.82.8 0.4250.425 (a) Construct a 99% confidence interval for the mean lead level in water specimans of the subdevelopment. blank≤μ≤blank (b) Construct a 99% confidence interval for the mean copper level in water specimans of the subdevelopment. blank≤μ≤blankA sample of 150 plastic panels was selected and tested for shock resistance and scratch resistance. The results are summarized in the Table 4 below. Table 4: Total number of shock and scratch resistance Scratch(high) Resistance(low) Shock(high) 0.42 Resistance(low) 0.26 0.14 0.18
- Forty-five specimens of a certain type of powder were analyzed for sulfur trioxide content. Following are the results, in percent. The list has been sorted into numerical order. 15.3 15.6 14.8 15.3 14.9 14.7 14.1 14.2 14.4 16.1 16.2 16.6 17.3 14.4 17.2 17.3 14.7 14.8 15.7 14.3 14.4 15.0 15.4 15.7 16.4 17.2 17.8 14.3 14.4 14.8 15.0 15.4 15.9 16.4 17.2 21.9 14.3 14.6 14.8 15.2 15.5 15.9 16.5 17.2 22.4 Construct a stem-and-leaf plot for these data. a. Construct a histogram for these data. Construct a dotplot for these data. b. C. d. Construct a boxplot for these data. Does the box-plot show any outliers?Periodically, the county Water Department tests the drinking water of homeowners for contaminants such as lead and copper. The lead and copper levels in water specimens collected in 1998 for a sample of 10 residents of a subdevelopement of the county are shown below. lead (μμg/L) copper (mg/L) 4.4 0.643 2.4 0.57 1.5 0.46 2.6 0.895 5.9 0.2 3.4 0.54 3.8 0.245 1.6 0.583 5.7 0.769 1.7 0.215 (a) Construct a 9999% confidence interval for the mean lead level in water specimans of the subdevelopment. ≤μ≤OC O a Relative Frequency Relative Frequency as 15:25 15 45 55 05 Impurities (percent) 35 45 55 65 Impurities (percent)
- Periodically, the county Water Department tests the drinking water of homeowners for contaminants such as lead and copper. The lead and copper levels in water specimens collected in 1998 for a sample of 10 residents of a subdevelopement of the county are shown below. lead (μμg/L) copper (mg/L) 4.44.4 0.6430.643 2.42.4 0.570.57 1.51.5 0.460.46 2.62.6 0.8950.895 5.95.9 0.20.2 3.43.4 0.540.54 3.83.8 0.2450.245 1.61.6 0.5830.583 5.75.7 0.7690.769 1.71.7 0.2150.215 (a) Construct a 9999% confidence interval for the mean lead level in water specimans of the subdevelopment. ≤μ≤≤μ≤ (b) Construct a 9999% confidence interval for the mean copper level in water specimans of the subdevelopment. ≤μ≤≤μ≤Listed below are the measured radiation absorption rates (in w/kg) corresponding to 11 cell phones. Use the given data to conduct a boxplot and identify the 5 number summary. 1.31, 0.91, 1.44, 0.93, 0.87, 0.51, 1.03, 0.79, 1.43, 0.59, 0.76