A Male Female Total Not at all 25 25 50 0.403226 Somewhat 16 19 35 0.282258 Very 24 15 39 0.314516 Total 65 59 124 26.20968 23.79032 18.34677 16.65323 20.44355 18.55645 0.359059

An opinion poll asked a random sample of adults whether they believe flu shots are ineffective in the United States. A commentator believes less than 35% of all adults believe they are ineffective. Which null and alternative hypotheses should be used to test this claim? Group of answer choices H0: p ≠ 0.35, Ha: p < 0.35 H0: p = 0.35, Ha: p < 0.35 H0: p = 0.35, Ha: p ≠ 0.35 H0: p < 0.35, Ha: p = 0.35 H0: p = 0.35, Ha: p > 0.35

A teacher is comparing the mena study time of his freshmen and senior students. He believes that his senior students spend more time studyin per week than his freshmen studnet and decides to perform a hypothesis test on his belief. a. Suppose the decision of the hypothesis test is to reject the null hypothesis. If, in realiry, treshmen study for a mean of 10 hours per week and seniors study for a mena of 15 hours per week, was an error made? if so, what type? b. Suppose the decision of the hypothesis test is to fail to reject the null hypothesis. if, in realiry, freshmen study for a mena of 15 hours per seek and seniors study for a mean of 15 hours per week, was an error made? is so, what type?

Example 2: Bryan coaches track and field at a local high school and during the previous season he got the impression that his 800m runners performed better when their races were in the morning as opposed to the afternoon. This season, he wanted to determine if his runners in fact performed better in the morning so he recorded all of their times for each race throughout the entire season. The data that he recorded for the morning and afternoon races are shown below. Carry out an appropriate hypothesis test at the a = 0.05 level to determine if his 800m runners performed better in the morning than in the afternoon. Sample Size Standard Deviation Average Morning 38 14 122 Afternoon 54 13 124

2. An elementary school teacher is interested in determining whether her male students will report having a greater number of close friends than her female students (the teacher is predicting that males will report having more close friends than females). The teacher asks each student to indicate how many close friends they have on a survey. The teacher is concerned that the data will be skewed so she knows she will have to use a nonparametric inferential statistic for her data. Based on this information use the following obtained data set to answer the questions below. Female Students Reported number of close friends 3 3 4 5 6 8 Male Students Reported number of close friends 1 7 7 11 13 15

In a sample of 183 male job-holders, 55% said that they are satisfied with their jobs. In another sample of 171 female job-holders, 65% said that they are satisfied with their jobs. The null hypothesis is that the proportions of all female and all male job-holders who are satisfied with their jobs are equal. The alternative hypothesis is that the proportion of all female job-holders who are satisfied with their jobs is greater than the proportion of all male job-holders who are satisfied with their jobs. The significance level is 2%. What is the approximate p-value for this test? e. 0.9732 b. 0.9975 d. 1.0000 a. 0.9139 c. 0.9724

Olivia attends school at the University of Alberta and decides to compile a contingency table of students who are taking various degrees. She surveys a group of students, and the data she collects is listed in the contingency table below. Olivia want to see if degree and gender are dependent variables.   PhD Masters Undergraduate Male 19 24 79 Female 13 27 63 (a) In performing this statistical test, state the hypotheses. H0: Degree and gender are independent vs. HA: Degree and gender are dependent H0: The proportion of female students is the same as the proportion of male students vs. HA: The proportion of female students is not the same as the proportion of male students H0: Degree and gender are dependent vs. HA: Degree and gender are independent H0: Degree is related to gender vs. HA: Degree is not related to gender H0: Degree is associated with gender vs. HA: Degree is not associated with gender (b) What is the expected frequencies of each cell?  Fill out the table.…

The National Association of Realtors reported that 26% of home buyers in the state of Florida are foreigners in 2012. The correct hypothesis statement to test the validity of this report would be a. O b. O c. d. H0: p = 0.26; H1: p + 0.26. H0: p = 0.26; H1: p > 0.26. H0: p = 0.26; H1: p < 0.26. H0: p = 0.26; Hl: p = 0.26.

A local teacher wants to see if teaching writing in different ways impacts student learning. She has two classes of similar characteristics. In one class, she will use Teaching Strategy A and in the other class she will use Teaching Strategy B. She ran her analysis in Microsoft Excel and received the following output table. If the P value is less than 0.05, the null hypothesis may be rejected. Based on the data table, what decision should the teacher make about the hypothesis?

Suppose that you are considering whether to publish a weekly alternative newspaper on campus. You decide to survey a random sample of students on your campus to ask if they would be likely to read such a newspaper. Your plan is to proceed with publication only if the sample data provide strong evidence that more than 10% of all students on your campus would be likely to read such a newspaper. The parameter of interest is the proportion of all students who would likely read an alternative campus newspaper. The null hypothesis = 0.10 and the alternative hypothesis is greater (>) than 0.10. -What is power in the context of this problem?