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2:59 .. LTE El 3 uml.umassonline.net 16. A researcher wants to examine how the chemical tryptophan, contained in foods such as turkey, can affect mental alertness, at an alpha of .05, two tailed. A sample of n = 25 college students is obtained and each student's performance on a familiar video game is measured before and after eating a traditional Thanksgiving dinner including roast turkey. After the meal, The average decrease in scores was M = 8 points, with variance 52 = 225 for the difference scores. Answer the questions below (6 points total this problem). a. What are the df? b. What is the Standard error? c. What is the calculated value of T? d. Assume the critical cutoff for a two tailed T is plus or minus 2.35. Is your nding signicant or not? Say something about why you can or cannot reject the null e. Compute 1'2 to measure the size of the effect. r. Write a sentence demonstrating how the outcome of the test and the measure of effect size would appear in a research report. SPSS Portion Here you analyze T tests in SPSS, and interpret output. 14 points total this section Part I Independent Sample (8 points) There is research being conducted on chow for small dogs. Below are the comparison between weights (wt) of a group of dogs with normal food and with the special food. Group 1 is the group that had the Normal Diet, and Group 2 is the group that had the Special Diet. Wt Group DONUIOOChOOKD-kLDCN-PUICNiLIIMG-p )NNMNNNF'P'F'r''r'rlrirtrI 3:00 . LTE uml.umassonline.net Part I Independent Sample (8 points) There is research being conducted on chow for small dogs. Below are the comparison between weights (wt) of a group of dogs with normal food and with the special food. Group 1 is the group that had the Normal Diet, and Group 2 is the group that had the Special Diet. Wt Group 4 NNNNNNNNNN - Once you have entered the data, . In SPSS go to Analyze: Compare Means: Independent Samples. . You will see a dialogue box that says test variables and grouping variables. Click on the weight variable to go in the test variable box, and the group variable to go in the grouping variable box. . Under the grouping variable box you will see where it says "define groups?" Click on that. . Another dialogue box will open which says "user specified values." . Put a 1 in group 1 and a 2 in group 2 (you have just told the program that your data is divided into two groups, and that the groups are identified with the number 1 and the number 2.) Then hit OK.,. An output box will open. Copy and paste that output into your hw doc. Use the output to respond to the following questions: 1. Looking at the group statistics box, what is the mean and standard deviation for weight in group one and group two? (1 points) 2. Look at the next box that says Independent Samples Test. Ignore the first few columns about Levene's equality of variances-this is not the outcome of the t test, you don't need to focus on that right now. Go right to the INDEPENDENT SAMPLES t TEST COLUMN. a. What are the t and the df in the first row of data in this box? (2 pts) b. What is the significance level? What does this mean about whether we are in the nun uistounion: (2 pts)3:00 .. LTE E11 3 uml.umassonline.net c. Are the weights for the Normal and Special diets different or not different, according to this test? (1 pt) d. What is the 95% condence interval for the difference (it is in the output!), and what do these numbers mean in words? (2 pts) Part II Repeated measures 6 points total Enter the below data, being sure to keep it aligned. There is research being conducted on chow for small dogs. Below are the comparison between weights of a group of the same dogs before and after the special diet. Before After 9.00 4.00 8.00 6.00 6.00 5.00 8.00 5.00 5.00 6.00 6.00 5.00 8.00 4.00 7.00 6.00 4.00 5.00 5.00 4.00 Once you have entered the data, - go to analyze, compare means, paired samples. . A dialogue box will open, with a spot for \"paired variables.\" - Put one variable into one box, and the other right next to it (not below it)., . Then click \"ok.\" You will get more output. Paste it into your hw doc. 1. Looking at the group statistics box, a. What is the mean and standard deviation for their weight at time one at time two? (1 point) In. Where have you seen this before? (1 point) 2. Now look below at the paired samples test. a. What is the t value? (1 point) b. Is it signicant? (1 point) (2.15 it the same or different from the T value from the test above? (1 point) d. The data are the same in both cases. If the T value is different, why do you think that is? (2 points)