Comparing scales: In an experiment to determine whether there is a systematic difference between the weights obtained with two different scales, 10 specimens were weighed, in grams, on each scale. The following data were obtained:
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- Spacers are manufactured to the mean dimension and tolerance shown in Figure 29-12. An inspector measures 10 spacers and records the following thicknesses: 0.372" 0.376" 0.379" 0.375" 0.370" 0.373" 0.377" 0.378" 0.371" 0.380" Which spacers are defective (above the maximum limit or below the minimum limit)? All dimensions are in inches.Listed below are the measured radiation absorption rates ( in 5 - number summary . W/kg) corresponding to 11 cell phones . Use the given data to construct a boxplot and identify the 1.49,1.25, 1.38, 1.04, 1.46, 1.31, 1.28, 0.73, 1.41, 0.58, 1.36Given a 95% C.I. = (34.14 mm, 36.02 mm) for a sample of Wooly Bear caterpillar lengths (preceding problem), address the following. Based upon the above information, I am _____ % confident that the 95% C.I. contains the sample mean.
- When looking at standard scores, we are considering which of the following scales of measurement? Nominal Ordinal Ratio IntervalIn an experiment to determine whether there is a systematic difference between the weights obtained with two different scales, 10 rock specimens were weighed in grams on each scale. The following data presented in the table were obtained. Can you conclude that the mean weight differs between the scales? Use a=0.03. Specimen Weight on Scale 1 Weight on Scale 2 di 1 11.23 11.27 -0.04 2 14.36 14.41 -0.05 3 8.33 8.35 -0.02 4 10.50 10.52 -0.02 5 23.42 23.41 0.01 6 9.15 9.17 -0.02 7 13.47 13.52 -0.05 8 6.47 6.46 0.01 12.40 12.45 -0.05 10 19.38 19.35 0.03Consider a sample data set with the summary statistics s= 112, Q = 58, and Q, =203. %3D a. Calculate IQR. b. Calculate IQR/s. c. Is the value of IQR/s approximately equal to 1.3? What does this imply? a. IQR =
- For r=0.7789 and sample size=10, the corresponding t value is:" 2.512 3.512 3.034 2.891 3.789 correct option?Listed below are the measured radiation absorption rates (in W/kg) corresponding to 11 cell phones. Use the given data to construct a boxplot and identify the 5-number summary. 1.42 0.88 1.48 1.46 1.02 1.09 0.63 0.79 1.47 0.58 0.94Fifteen women were enrolled in a slimming program for a period of 8 weeks. Their weights were taken before and after the program, and are shown below: Test at 0.05 level of significance. If there was a significant difference before and after the program. Find the following: Statistics: Tabular Value: Computed Value: Conclusion:
- Two types of instruments for measuring the amount of sulfur monoxide in the atmosphere are compared in an air-pollution experiment. It is desired to determine whether the two types of instrument yield the equal mean measurement. The following readings were recorded for the two instruments: Sulfur Monoxide Instrument A 0.96 0.82 0.75 0.61 0.89 0.64 0.81 0.68 0.65 Instrument B 0.87 0.74 0.63 0.55 0.75 0.70 0.69 0.57 0.53 Construct 90% confidence interval for the ratio of standard deviations of measurements of the two instruments. Depending upon the answer to part (a), construct 95% confidence interval for the difference between the mean measurements of the two instruments and interpret your answer. Assume the measurements are approximately normally distributed. Do the mean measurements of the two instruments differ?Sample Size, n 2 3 4 5 6 78912 10 Mean Factor, A₂ 1.880 1.023 0.729 0.577 0.483 0.419 0.373 0.337 0.308 0.266 Upper Range, D4 3.268 2.574 2.282 2.115 2.004 1.924 1.864 1.816 1.777 1.716 Lower Range, D3 0 0 0 0 0 0.076 0.136 0.184 0.223 0.284Given n=10 measurements: 13, 15, 14, 16, 20, 15, 16, 19, 12, 18 The mean is