Exam 12: Comparing Several Means

Levene's test tests whether?

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

What kind of trend does the following graph show?

A Bonferroni correction is when?

In the above table what is the likely interpretation for whether any difference in net promoter score exists between the defined groups?

What is the definition of 'mean square'?

Do coffee products from China, India or South Africa take more or less time to ship to the UK? An ANOVA was employed to test this question. What is the missing value (??) for F in the table below?

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

Consider this table of customer net promoter scores for the iPad 4: Analysis of variance -If all samples sizes are equal then the study used.

The F-ratio of 15.3 in the above table is calculated by?

A training consultant wanted to see the effects of different learning strategies for teaching management accounting skills to employees. A control group read the book Accounting for Managers (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 trainer 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 be worse than the 'all activities' group. Which coding scheme would test these hypotheses in a set of planned comparisons?

Using the same data, post hoc tests were run. Based on the output for these tests, what should the HR manager conclude?

A follow-up experiment to better understand net promoter scores was conducted using 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?

An HR manager was looking at the effects of an employee involvement scheme on commitment levels of the organization's staff. Three groups were used: no scheme applied, experiencing the scheme and post scheme (a group who had been subjected to the scheme 6 months before). The change in commitment over the time that the scheme was recorded is the dependent variable (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?

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

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)?