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http://www.chegg.com/homework-help/questions-and-answers/select-question-5-instead-using-spss-software-referenced-text-simply-write-steps-needed-an-q18795872 Please help with this exercise, I only need the steps to resolve.
Select Question no 5 and Instead of using SPSS software as referenced in the text, simply write out the steps needed to answer the problem.
Show transcribed image texthnique le one- exam es you the test 251 Chapter 13 Two Groups Too Many? 3. Using the data in Chapter 13 Data Set 2 and SPSS, compute the F ratio for a comparison among the three levels representing the aver- Video 13.6 age amount of time that swimmers practice weekly 15, 15-25, and 25 hours), with the outcome variable being their time for the 100-yard freestyle. Answer the question of whether practice time makes a difference. Don't forget to use the Options feature to get the means for the groups. 4. The data in Chapter 13 Data Set 3 were collected by a researcher who wants to know whether the amount of stress is different for three Video 13 groups of employees. Group 1 employees work the morning day shift, Group 2 employees work the day/evening shift, and Group 3 employees work the night shift. The null hypothesis is that there is no difference in the amount of stress between groups. Test this in SPSS and provide your conclusion 5. The Noodle company wants to know what thickness of noodle con- sumers find most pleasing to their palate (on a scale on 1 to 5, with Video 13.8 1 being most pleasing), so the food manufacturer put it to the test. The data are found in Chapter 13 Data Set 4. Turns out that there is a significant difference (F 19.398, p .001), and thin noodles are most preferred. But (2,57) about differences among thin, medium, what and thick noodles? Post hoc analysis to the rescue! STUDENT STUDY SITE for additional exercises Go to 13, Two Groups Too Many?, for and study resources. Select Chapter chapter-specific activities. Media Links Flash Cards Data Sets Chapter Quiz SAGE Journal Articles Author Video
hnique le one- exam es you the test 251 Chapter 13 Two Groups Too Many? 3. Using the data in Chapter 13 Data Set 2 and SPSS, compute the F ratio for a comparison among the three levels representing the aver- Video 13.6 age amount of time that swimmers practice weekly 15, 15-25, and 25 hours), with the outcome variable being their time for the 100-yard freestyle. Answer the question of whether practice time makes a difference. Don't forget to use the Options feature to get the means for the groups. 4. The data in Chapter 13 Data Set 3 were collected by a researcher who wants to know whether the amount of stress is different for three Video 13 groups of employees. Group 1 employees work the morning day shift, Group 2 employees work the day/evening shift, and Group 3 employees work the night shift. The null hypothesis is that there is no difference in the amount of stress between groups. Test this in SPSS and provide your conclusion 5. The Noodle company wants to know what thickness of noodle con- sumers find most pleasing to their palate (on a scale on 1 to 5, with Video 13.8 1 being most pleasing), so the food manufacturer put it to the test. The data are found in Chapter 13 Data Set 4. Turns out that there is a significant difference (F 19.398, p .001), and thin noodles are most preferred. But (2,57) about differences among thin, medium, what and thick noodles? Post hoc analysis to the rescue! STUDENT STUDY SITE for additional exercises Go to 13, Two Groups Too Many?, for and study resources. Select Chapter chapter-specific activities. Media Links Flash Cards Data Sets Chapter Quiz SAGE Journal Articles Author VideoExplanation / Answer
Ok, I get your predicament.
You have found that if there is any significant difference between atleast one pair of means using ANOVA test. That is what Anova test does, it will check for some evidence to disprove the null which is mu1 = mu2 = mu3. You have proved there is a difference, to find out if there are differences between each pair of means and how much it is, we can use John Tukey’s HSD test (Honestly Significant difference)
To do that if there are 3 groups then you have to do 3 matching tests. The no. of tests is obtained by nC2 formula (the no. of 2 person combinations possible for n groups).
To find out the difference between the means, be warned that there is no single difference. Meaning there is no absolute number to say that mu1-mu2 is 4.5 and mu2-mu3 is 6.3. What we can only say is the difference b/w mu1 and mu2 lies between the interval x and y with 95% confidence level.
e.g mu1-mu2 lies between 6.8 to 9.3 with 95% confidence levels
mu2- mu3 lies between -5 to -1.3 with 95% confidence levels
Intervals can be calculated by the formula mu(i) – mu(j) +/- Q(alp, r, dfw) MSW/2* SQRT(1/ni +1/nj).
Let us analyse every part of it. Mui – muj is simple, the difference between the mean of 2 groups
Q(0.05, no. of groups = 3, dfw = 20*3-3=57). Q is studentised range statistic. Easy.
MSW is mean square of deviation within groups
And the last one in your case ni and nj are equal to 20
You have to do this for 3 combinations, mu1 – mu2, mu2-mu3, mu3-mu1 and will have 3 confidence intervals, one for each of the pair of groups
To check if the difference in the means you have calculated are significant,
if both the signs of the lower and upper limit of the interval are same then there is significant difference in means of those 2 groups
if both the signs are different, then 0 is between the interval and hence we cannot say there is significant difference in means of those 2 groups.
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