Exam 12: Glm 1: Comparing Several Independent Means

In an experiment to determine the effects of low-dose analgesia versus high-dose analgesia in arthritis sufferers, the following findings are reported: 'there was a significant effect of medication A (low-dose analgesia) on pain control F(2, 18) = 8.14, p < .05, ω = .72'. What does this tell you about the result?

What is the definition of 'mean square''?

If the critical region for a test of hypothesis is F > 9.48773 and the computed value of F from the data is 0.86 then which of the following is correct?

When variances across groups are unequal, which of the following is not an appropriate course of action?

A psychologist was looking at the effects of an intervention on depression levels. Three groups were used: waiting list control, treatment and post treatment (a group who had had the treatment 6 months before). The change in depression levels over the time of the treatment was recorded (although bear in mind that only the treatment group actually got any treatment during this time). The SPSS output is below. Based on this output, what should the researcher conclude?

What does the term 'familywise error rate' mean?

In a study of the influence of yogurt consumption and immunity (Van de Water, Keen, & Gershwin, Journal of Nutrition, 1999) there were three study groups per age group (young adults and senior adults). Live-culture yogurt, pasteurized yogurt and control (no yogurt) were given to each age group in portion sizes of 200 grams per day for 1 year. Under what conditions would ANOVA be violated?

A researcher wanted to see the effects of different learning strategies. A control group simply read the book Discovering Statistics (book), a second group read the book and completed the 'end of chapter exercises' (book and exercises), and a third group read the book, did the end of chapter examples and also completed the web materials (all activities). The researcher predicted that the all activities and book and exercises groups would perform better than the book group on a subsequent test, but that the book and exercises group would do worse than the all activities group. Which coding scheme would test these hypotheses in a set of planned comparisons?

Post hoc tests were run using the data below. Based on the output for these tests, what should the researcher conclude?

What kind of trend does the following graph show?

In a simple analysis of variance problem, which of the following is an estimate of the variance of individual measurements (after the various effects have been accounted for)?

Which of the following is not considered a standard contrast in the SPSS environment?

Levene's test tests whether

A Bonferroni correction is when

An experiment was conducted as a one-way factorial design with K sample means, each based on n scores. What is the number of degrees of freedom for the between mean squares?

What are post hoc tests used for?

When would you use the Kruskal-Wallis test?

The total variation in response, assuming no bias, is due to error (unexplained variation) plus differences due to treatments (known variation). If known variation is large compared to unknown variation, which of the following conclusions can be drawn?

In the table below, what is the likely interpretation? Analysis of Variance

Under what conditions would planned comparisons be used?