In a Survey of 8000 women, 5431 say they change thir nail polish once a week. Construct a 90% confidence interval for the population proportion of women who change their nail polish once a week.

Question:In a Survey of 8000 women, 5431 say they change their nail polish once a week. Construct a90% confidence interval for the population proportion of women who change their nail polishonce…

 

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In a survey of homemakers, the readership of Harper’s Bazaar was exaggerated and the readership of Modern Romance seemed much less than circulation figures indicated.

Why would respondents incorrectly report their readership in this manner?

How might researchers avoid this bias?

As you develop your contributions to the discussion, be sure to include concrete examples to help others understand your points.

 

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In a survey of recruiters from companies with more than 50,000 employees, __________________ skills were cited as the single most important decisive factor in choosing managers. Kelly and Manpower report that they are selecting and placing job candidates with better __________________ or interpersonal skills than candidates with higher degrees.

 

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In a survey of520potential jurors, one study found that350were regular watchers of at least one crime-scene forensics television series.(a) Assuming that it is reasonable to regard this sample of520potential jurors as representative of potential jurors in the United States, use the given information to construct a 95% confidence interval for the true proportion of potential jurors who regularly watch at least one crime-scene investigation series. (Use Table 3 inAppendix A. Give the answer to three decimal places.)

Show your steps

(,)

(b) Would a 99% confidence interval be wider or narrower than the 95% confidence interval from Part (a)?

widernarrower

 

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Can you please show calculations:In a test of a new surgical procedure, five respected surgeons in FlatBroke Township were invited to Carver Hospital. Each surgeon was assigned two patients of the same age, gender, and overall health. One patient was operated upon in the old way, and the other in the new way. Both procedures are considered equally safe. The time (in minutes) to complete each procedure was carefully recorded. Use a right-tail test at α = .05. 10. The critical value is A) 3.162 B) 1.645 C) 2.776 D) 2.132 11. The test statistic is A) 3.162 B) 1.645 C) 1.860 D) 2.132 12. Which of the following is a reasonable conclusion? A) The Old Way takes more time than the New Way B) There is not enough evidence to conclude that one method is faster than the other. C) The New Way take more time than the Old Way. ————————–Use the following scenario to answer questions 13 to 15. The Board of Surgeons recommends a postoperative examination six months after a prostatectomy. In a sample from the records of Carver Memorial Hospital, follow-up exams were given in 80 out of 200 cases. In a sample of records from HiRent Hospital, follow-up exams were given in 120 out of 200 cases.13. Normality may be assumed because A) the population may be assumed normal. B) the population may be assumed large. C) the samples may be assumed random. D) nπ ≥ 10, n(1-π) ≥ 10 for both samples. 14. The test statistic is: A) -1.96 B) -2.58 C) -4.00 D) -3.477 15. If we are using α = .01 and a left-tailed test the decision is A) clearly reject the hypothesis of equal proportions. B) barely reject the hypothesis of equal proportions. C) barely accept the hypothesis of equal proportions. D) clearly accept the hypothesis of equal proportions. 4. If you have 4 factors (call them A, B, C and D) in an ANOVA experiment with replication you could have 4 different two-factor interactions.TrueFalse5. Use the following scenario to answer questions 5 to 12.Sound engineers studied factors that might affect the output (in decibels) of a rock concert speaker system. The desired level of significance was α = .05. The results of their ANOVA tests are shown.The number of positions tested was A) 1 B) 2 C) 3 D) 4 6. The number of amplifiers tested was A) 1 B) 2 C) 3 D) 4 E) 24 7. The number of observations was A) 16 B) 19 C) 23 D) 24 8. The number of observations per cell was A) 1 B) 2 C) 3 D) 4 9. The effect of amplifier was A) significant. B) insignificant. 10. The effect of position was A) significant. B) insignificant. C) borderline. 11. The F statistic for amplifier was A) 10.16 B) 9.90 C) 5.72 12. The interaction was A) significant. B) insignificant. C) borderline. Use the following scenario to answer questions 13 to 15.Three randomly-chosen pieces of four types of PVC pipe of equal wall thickness are tested to failure to determine the burst strength (in pounds per square inch) under three temperature conditions, yielding the results shown below. 13. Which test would be appropriate? A) two-factor ANOVA with replication. B) one-factor ANOVA. C) dependent (paired samples) t-test. D) two-factor ANOVA no replication. 14. Total degrees of freedom would be A) 19 B) 12 C) 35 D) 59 15. An interaction test would be appropriate. A) True. B) False

 

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