# 3 because the weights are likely to follow a normal

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Chapter 8 / Exercise 22
Mathematical Excursions
Aufmann
Expert Verified
3. Because the weights are likely to follow a normal distribution, on expects the points in a normal quantile plot to approximate a straight line. 4. Identify outliers. If there is more than one outlier present, reject the idea that the data come from a normal distribution. 5. No, the data do not appear to come from a population with a normal distribution. The points are not reasonably close to a straight line. 6. Yes, the data appear to come from a population with a normal distribution. The points are reasonably close to a straight line. 7. Yes, the data appear to come from a population with a normal distribution. The points are reasonably close to a straight line. 8. No, the data do not appear to come from a population with a normal distribution. The points form a S-shaped pattern, and not a straight line.
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Chapter 8 / Exercise 22
Mathematical Excursions
Aufmann
Expert Verified
184 CHAPTER 6 Normal Probability Distributions 9. Yes, the data appear to come from a population with a normal distribution. The frequency distribution and histogram indicate that the data is approximately bell-shaped. duration (hours) frequency 0 – 49 1 50 – 99 8 100 – 149 18 150 – 199 23 200 – 249 25 250 – 299 19 300 – 349 11 350 – 399 8 400 – 449 2 115 10. No, the data do not appear to come from a population with a normal distribution. The frequency distribution and the histogram indicate the data are positively skewed. number of flights frequency 0 67 1 71 2 57 3 52 4 42 5 16 6 5 7 2 312 11. No, the data do not appear to come from a population with a normal distribution. The frequency distribution and the histogram indicate there is a concentration of data at the lower end. degree days frequency 0 – 499 20 500 – 999 5 1000 – 1499 8 1500 – 1999 9 2000 – 2499 5 2500 – 2599 1 48 duration (hours) frequency 400 300 200 100 0 25 20 15 10 5 0 number of flights frequency 7 6 5 4 3 2 1 0 80 70 60 50 40 30 20 10 0 degree days frequency 3000 2500 2000 1500 1000 500 0 20 15 10 5 0 ___________________________________________________________________
Assessing Normality SECTION 6-7 185 12. Yes, the data appear to come from a population with a normal distribution. The frequency distribution and the histogram indicate the data is approximately bell-shaped. volts frequency 124.0 2 124.1 0 124.2 1 124.3 2 124.4 4 124.5 4 124.6 5 124.7 6 124.8 7 124.9 3 125.0 2 125.1 2 125.2 2 40 NOTE : The normal quantile plots for Exercises 13-16 may be obtained directly from many sources or constructed using Minitab for n scores in C1 using the commands at the right, where (2n-1) and (2n) are the actual values, and then plotting C1 on the x-axis and C4 on the y-axis. See Exercises 19 and 20 for more detail on the mechanics of this process, which is the five-step “manual construction” process given in the text. 13. Yes. Since the points approximate a straight line, the data appear to come from a population with a normal distribution. The gaps/groupings in the durations may reflect the fact that the times have to reflect whole numbers of orbits or other physical constraints. 14. No. Since the points do not approximate a straight line, the data do not appear to come from a population with a normal distribution.