Chapter 9, Problem 9.19LB

In a survey of working parents (both parents working), one of the questions asked was "Have you refused a job, promotion, or transfer because it would mean less time with your family?" Two hundred men and 200 women were asked this question. Twenty-nine percent of the men and 24% of the women responded "yes." a. Based on this survey, can we conclude that there is a difference in the proportion of man and women responding “yes" at the 0.05 level of significance? (i) State the null and alternative hypotheses (ii) What test statistics would you use and why? (iii) Compute the value of the test-statistic. (iv) What rejection region would you use? (v) State your conclusion in the context of the problem. b. What P-value is associated with this test? Based on this P-value, could H. be rejected at significance level 0.08? c. Find a 95% confidence interval for the difference between the proportion of men and women responding "yes." Based on this confidence interval, would your conclusion be the…

Sophomore, junior, and senior students at a high school will be surveyed regarding a potential increase in the extracurricular student activities fee. There are three possible responses to the survey question - agree with the increase, do not agree with the increase, or no opinion. A chi-square test will be conducted to determine whether the response to this question is independent of the class in which the student is a member. How many degrees of freedom should the chi-square test have?

A random sample of 1000 households was surveyed to find out if they plan on having a smaller Thanksgiving gathering than they have participated in past years. What is the wording in the context of this problem for the parameter p?

Using the same question as in question 1 (restated below), answer the following question: A consumer psychologist asked to test a claim by a swimming school that its instructors could teach the average seven-year-old to swim across an Olympic-sized pool in less than 2 minutes. The psychologist arranged for eight randomly selected seven-year-old children to take lessons at the school and recorded how long it took each child to swim across a pool at the end of the lessons. The times (in seconds) were 60, 65 100, 80, 70, 90, 100, and 100, which averages to 83.125 .  The known population's mean was 120 seconds.  If you ran a statistical test on this data and came up with the following results, would you say that the lessons resulted in a significant change in time taken to swim across the pool?   Cutoff t score needed = +/-1.895  t = 2.88  Is the t score given more extreme than the cutoff score in the desired direction?     Select one: a. No, it is not significant. b. Yes, it is…

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Parts c and d

I need help with #1 parts A through D

be filled in. Problem: To study the effectiveness of possible treatments for insomnia, a sleep researcher conducted a study in which four participants were instructed to count sheep (the Sheep Condition), four were told to concentrate on their breathing (the Breathing Condition), and four were not given any special instructions. The average number of minutes taken for each participant to fall asleep over the next seven days were 14, 28, 27, and 31 minutes for the Sheep condition; 25, 22, 17, and 14 minutes for those in the Breathing condition; and 45, 33, 30, and 41 for the Control condition. Using the .05 significance level, did the different techniques have different effects?   Step 1: Restate the question as a research hypothesis and a null hypothesis about the populations.             Pop 1: ???             Pop 2: ???             Pop 3: ???   Null hypothesis: ??? Research hypothesis: ???   Step 2: Determine the characteristics of the comparison distribution. What type of…

Question 31: give the conclusion