11/2/2016 Quiz: CH. 11. Assignment.two samples t test.f16 CH. 11. Assignment.two samples t test.f16 Started: Oct 31 at 4:04am Quiz Instructions This assignment is due when open and until it closes on Sunday night. Please feel free to print and/or work on the questions prior to submitting it for a grade. Question 1 6 pts A social psychologist wanted to determine whether attitudes of men toward abortion were dif ferent in rural and urban areas. He prepared a questionnaire and administered it to a group of city dwellers and a group of country dwellers. Each city man was matched with a country man on age, income, and education. High scores indicate positive attitudes toward abortion. Here are the questionnaire scores. Conduct a t test, d, and write your conclusions about the t test in three sentence forma, plus a statement about the ef fect size. Please state your conclusions in three paragraph format (4 points). Must address the following sections, including the p symbol. 1. reject or fail to reject statement 2. if there is or if there is no relationship 3. specifically stating the conclusion by eyeballing the means... :) 4 Don't forget to use the stat symbol for p value as well. Rural Men Urban Men 22 25 19 23 18 20 17 18 15 12 10 9 6 4 https://csn.instructure.com/courses/1279162/quizzes/1766354/take 1/8 11/2/2016 Quiz: CH. 11. Assignment.two samples t test.f16 4 3 Upload Choose a File Question 2 5 pts An experimenter randomly divided a group of volunteers into two groups. One group fasted for 24 hours and the other for 48 hours. One person in the 24hour group dropped out of the study . Scores below rep resent the number of ounces of Y ummi (V ery Vanilla) consumed during the first 10 minutes after the fast. Perform a t test, calculate d, and write a sentence summary of your results. Please submit all necessary calculations and circle/or place a box around your answers so that I can easily locate the scores. Please show all necessary stepts prior to calculating the t. Please state your conclusions in three paragraph format (4 points). Must address the following sections, including the p symbol. 1. reject or fail to reject statement 2. if there is or if there is no relationship 3. specifically stating the conclusion by eyeballing the means... :) 4. don't forget to add the ef fect size statement af ter calculating the d. 24 hours 48 hours 26 18 35 24 23 16 30 17 14 = 114 = 3330 Upload = 89 = 1641 Choose a File Question 3 Ten volunteers recorded their blood pressure in a room with an aquarium and then in a room w appropriate design for testing the significance of the dif ference between the means is https://csn.instructure.com/courses/1279162/quizzes/1766354/take 0.5 pts ithout one. The 2/8 11/2/2016 Quiz: CH. 11. Assignment.two samples t test.f16 relatedsamples ttest. independentsamples ttest. onesample ttest. z test. Question 4 We know that in an independent samples 0.5 pts ttest we could state our null hypothesis as . However, we usually state it as which of the following, instead? Question 5 0.5 pts Suppose you perform a twotailed independentsamples 16 participants in the other group. Y our ttest, using = 0.05, with 15 participants in one group and is 4.56, which is significant. Which of the following is the correct way to report this finding? (note: the number in the parenthesis is the df) t(31) = 4.56 p < 0.05 t(29) = 4.56 p < 0.05 t(29) = 4.56 p > 0.05 t(29) = 4.56 p = 0.05 Question 6 0.5 pts Null hypothesis statistical testing (NHST) allows an experimenter to conclude that the null hypothesis is https://csn.instructure.com/courses/1279162/quizzes/1766354/take 3/8 11/2/2016 Quiz: CH. 11. Assignment.two samples t test.f16 probably false probably true both of the descriptive alternatives are correct neither of the descriptive alternatives is correct. Question 7 0.5 pts As you may know , there has been bad blood be tween the Montague family and the Capulet family for a good while. In this modern day , resolution can be achieved by using a psychological test. In the test of "propen sity to fall in love," the mean of the 6 Montagues was 54 and the mean of the 10 Capulets was 64. (Italian norms show a national average of 100.) When a statistician compared the families with a t test, a value of 2.13 was obtained. If you adopt an level of .05 (twotailed test), you should conclude that the Capulets are significantly more loving than the Montagues significantly less loving than the Montagues not significantly dif ferent from the Montagues not yet comparable additional information is needed. Question 8 0.5 pts The freshmen competed with the sophomores to see who could raise the most money by recycling. The appropriate design for testing the significance of the dif feren ce between the means is related samples ttest. independent samples ttest. onesample ttest. z test. Question 9 How many subjects participated in an independent samples https://csn.instructure.com/courses/1279162/quizzes/1766354/take 0.5 pts ttest if a researcher reports df=20 and = 3.68? 4/8 11/2/2016 Quiz: CH. 11. Assignment.two samples t test.f16 22 21 20 18 Question 10 What are the degrees of freedom for an independent samples sample with n = 15? 0.5 pts ttest that uses one sample with n = 13 and one 28 27 26 24 Question 1 1 1 pts Type A people (M= 20) were compared to T ype B (M= 10) for productivity and a t value of 2.06 was obtained. With 14 A's and 24 B's, the two groups are not significantly dif ferent 10 B's, the A's are significantly more productive both of the descriptive alternatives are correct neither of the descriptive alternatives is correct. Question 12 1 pts Drugs used in treating schizophrenia all block the reception of dopamine by neurons. (Dopamine is a neurotransmitter , which, when released by the a xons of one nerve, inhibits the firing of the next nerve.) This fact led to the idea that schizophrenia occurs when too much dopamine is produced. Suppose the following data on dopamine https://csn.instructure.com/courses/1279162/quizzes/1766354/take 5/8 11/2/2016 Quiz: CH. 11. Assignment.two samples t test.f16 production were obtained. Schizophrenics Control Group 42 33 31 27 29 18 The study described above is an example of an independentsamples design a pairedsamples design comparing a sample mean to a known population mean unknown more information is required in order to decide. Question 13 "The difference between the two ____ means is 0.5 pts zero" is a statement of the null hypothesis. sample population sample or population none of the descriptive alternatives are correct. Question 14 0.5 pts In an independent samples design, the null hypothesis is that the population mean of one group is equal to that of a second group the population mean of one group is larger or smaller than that of a second group the sample mean of one group is equal to that of a second group the sample mean of one group is larger or smaller than that of a second group. https://csn.instructure.com/courses/1279162/quizzes/1766354/take 6/8 11/2/2016 Quiz: CH. 11. Assignment.two samples t test.f16 Question 15 1 pts In an independent samples design the Hatfields had a mean score of 25 against a mean score of 26 for the McCoys. Low scores mean better performance. The researcher ran a twotailed test with at .05. A t value of 1.99 was found. If df = 40, the Hatfields are significantly better than the McCoys. If df = 40, the McCoys are significantly better than the Hatfields. If df = 120, the Hatfields and the McCoys are not significantly dif ferent. If df = 120, the Hatfields are significantly better than the McCoys. If df = 120, the McCoys are significantly better than the Hatfields. Question 16 0.5 pts p > .05 means that the null hypothesis should be rejected difference between the two means is statisticall y significant both of the descriptive alternatives are correct neither of the descriptive alternatives is correct. Question 17 A onetailed test of significance produced a 0.5 pts t equal to 2.30, significant at the .05 level. The design of this experiment was a pairedsamples design was an independentsamples design could have been either a paired or an independentsamples design. https://csn.instructure.com/courses/1279162/quizzes/1766354/take 7/8 11/2/2016 Quiz: CH. 11. 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