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5. A researcher is interested in gender differences on attitudes toward flying. Polling a sample of 100 men and 80 women, he finds that 36% of the men and 40% of the women are fearful of flying. Test the significance of the difference in the sample proportions.4. A national polling organization conducts a telephone survey of American adults concerning whether they believe the president is doing a good job. A total of 990 persons surveyed had voted in the previous presidential election. Of the 630 who had voted for the president, 72% said they thought he was doing a good job. Of the 360 who did not vote for the president, 60% reported that they thought he was doing a good job. Test the null hypothesis of no difference in population proportions who believe the president is doing a good job (use a 0.05 level of significance).5. A researcher is interested in gender differences on attitudes toward flying. Polling a sample of 100 men and 80 women, he finds that 36% of the men and 40% of the women are fearful of flying. Test the significance of the difference in the sample proportions. 6. A pollster interviews by telephone a statewide random sample of persons aged 18 and over about their attitudes toward stricter gun control. Using the following set of results, test the significance of the difference between the portions of men and women who support stricter control. Males Females Favor 120 Oppose 35 2 166 2053. A psychologist in interested in whether mean tend to show signs of Alzheimer's disease at an early age than women. Following are the ages of onset of Alzheimer's disease symptoms sample of men and women. Test the null hypothesis that there is no difference between the age of onset of Alzheimer's symptoms for men and women. Men Women 18 82. In a test of the hypothesis that females smile at others more than males do, females and males were videotaped while interacting and the number of smiles emitted by each sex was noted. Using the following number of smiles in the 5-minute interaction, test the null hypothesis that there are no sex differences in the number of smiles. Males FemalesART II - Solve the following problems. 1. Two groups of subjects participated in an experiment designed to test the effect of frustration on aggression. The experimental group of 40 subjects received a frustrating puzzle to solve, whereas the control group of 40 subjects received and easy, non-frustrating version of the same puzzle. Level of aggression was then measure for both groups. Whereas the experimental group (frustration) has the mean aggression score X, = 4.00 and a standard deviation of s, = 2.00, the control group (no frustration) had a mean aggression score X, = 3.00 and a standard deviation $2 = 1.50 (higher mean score mean greater aggression). Using this result, test the null hypothesis of no difference with regard to aggression between the frustration and no-frustration conditions. What does the outcome of this indicate