Section 7.6 Assessing Normality 339 SECTION 7.6 Exercises Exercises 1– 6 are the Check Your Understanding exercises located within the section. Understanding the Concepts In Exercise 7, fill in each blank with the appropriate word or phrase. 7. A population is rejected as being approximately normal if the sample contains an , if the sample contains a large degree of , or if the sample has more than one distinct . outlier, skewness, mode In Exercise 8, determine whether the statement is true or false. If the statement is false, rewrite it as a true statement. 8. If the points in a normal quantile plot deviate from a straight line, then the population can be treated as approximately normal. False Practicing the Skills 9. The following dotplot illustrates a sample. Is it reasonable to treat this as a sample from an approximately normal population? Explain. No 0 1 2 3 4 5 10. The following dotplot illustrates a sample. Is it reasonable to treat this as a sample from an approximately normal population? Explain. Yes 2 3 4 5 6 7 8 11. The following boxplot illustrates a sample. Is it reasonable to treat this as a sample from an approximately normal population? Explain. Yes 15 20 25 30 35 12. The following boxplot illustrates a sample. Is it reasonable to treat this as a sample from an approximately normal population? Explain. No 0 5 10 15 20 25 30 13. The following histogram illustrates a sample. Is it reasonable to treat this as a sample from an approximately normal population? Explain. Yes 6 7 8 9 10 11 12 13 14 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 Relative Frequency 14. The following histogram illustrates a sample. Is it reasonable to treat this as a sample from an approximately normal population? Explain. No 0 2 4 6 8 10 12 14 16 18 0.25 0.20 0.15 0.10 0.05 0 Relative Frequency 15. The following stem-and-leaf plot illustrates a sample. Is it reasonable to treat this as a sample from an approximately normal population? Explain. No 0 35 1 46 2 0022358 3 18 4 3 5 4 6 36 7 19 8 34 9 4 10 11 8 16. The following stem-and-leaf plot illustrates a sample. Is it reasonable to treat this as a sample from an approximately normal population? Explain. Yes 7 35 8 47 9 024 10 379 11 37 12 34 13 0 14 1 17. The following normal quantile plot illustrates a sample. Is it reasonable to treat this as a sample from an approximately normal population? Explain. Yes 4 3 2 1 0 −1 −2 −3 −3 −2 −1 0 1 2 3 x z 18. The following normal quantile plot illustrates a sample. Is it reasonable to treat this as a sample from an approximately normal population? Explain. No
navidi_monk_elementary_statistics_2e_ch7-9
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