"when you have to compare 3 groups, it's better to use an anvoa because using multiple t-test would lead to alpha inflation. " O True O False
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- If you have 5 groups in your study, why shouldn't you just compute a t test of each group mean with each other group mean?Can the Kruskal-Wallis test be used for comparing more than three groups?Suppose you conducted an experiment with four independent groups. If you decided to use separate analyses to compare all possible pairs of groups, you would have to run six t tests for independent samples. Assuming you set a = .01 for each of the six t tests, what would the experimentwise alpha level be? Answer with a specific number.
- Develop two research hypotheses: (a) one that would be used to examine differences between two unrelated groups and (b) one that would examine differences between two dependent groups.Suppose you conducted an experiment with four independent groups. If you decided to use separate analyses to compare all possible pairs of groups, you would have to run six t tests for independent samples. Assuming you set a = .01 for each of the six t tests, what would the experimentwise alpha level be? Answer with a specific number. (I am not sure if it is .0016 or .016 or .06)Assume that you do an experiment with 8 groups and the population means for all 8 are equal. If you make all pairwise comparisons among the means using the 0.05 level, the chance that 1 or more comparisons will be significant is about: 0.05 0.10 0.20 0.50
- What kind of sampling technique to used and justify In 1500 SHS students, the researcher divided the population into subgroups; this was done by strands. The researcher needed 50 SHS students who belong to the ABM strand – PM shift. The researcher chooses the participants, being careful to adhere to the subgroup’s characteristicsStratified sampling is used to ensure that certain groups are adequately represented in a sample. Select one: True FalseThe population is divided into subgroups and a set of subgroups are selected to be in the sample. Is this a voluntary response, convenience sample, systematic sample, or cluster sample?
- If a researcher is comparing two groups’ times on a 40km cycling time trial, with both groups involving the same people, the differences are obtained by:A company that has 40 employees chooses a committee of 7 to represent employee retirement issues. When the committee was formed, none of the 18 minority employees were selected. Do you think the committee selection was biased? Give mathematical evidence for your decisions.A company studied the number of lost-time accidents occurring at its brownsville,Texas, plant. historical records show that 6% of the employees suffered lost-time accidents last year. Management believes that a special safety program will reduce suchaccidents to 5% during the current year. In addition, it estimates that 15% of employeeswho had lost-time accidents last year will experience a lost-time accident during thecurrent year.a. What percentage of the employees will experience lost-time accidents in bothyears?