Mt139C5 - MTB > Describe 'Quiz3'. Descriptive Statistics...

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MT139C5.PPT 1 MTB > Describe 'Quiz3'. Descriptive Statistics Variable N Mean Median Tr Mean StDev SE Mean Quiz3 18 3.778 4.000 3.875 1.263 0.298 Variable Min Max Q1 Q3 Quiz3 1.000 5.000 3.000 5.000 5 4 3 2 1 0 6 5 4 3 2 1 0 Quiz3 Frequency
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MT139C5.PPT 2 I Have Been Spending [ choose one ] Hour(s) Per Week for this Class: 1 or Less 2 to 3 4 to 5 6 or More 1 or Less ( 1, 5.6%) 4 to 5 ( 1, 5.6%) 2 to 3 (16, 88.9%) Pie Chart of Time 4 to 5 2 to 3 1 or Less 15 10 5 0 Time Count of Time
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MT139C5.PPT 3 Observational Study Observes individuals and measures variables of interest but does not attempt to influence the responses. Example: 1,000 individuals are asked whether they are smokers or non-smokers, then the rates of serious disease in these two groups are compared.
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MT139C5.PPT 4 Confounding Two variables are confounded when their effects on a response variable cannot be distinguished from each other. Example: It may be that smoking causes serious disease, but it may also be that smoking is associated with other habits that make one prone to disease (e.g., drinking, stress, fatty foods, etc.) Experiment Deliberately and systematically imposes some treatment on individuals in order to observe the effect of the treatment on the response. Example: 5,000 individuals are randomly selected, then randomly assigned to one of two groups. One group is given aspirin each day for 5 years. The other group is given a placebo daily. Following the study, heart disease rates in the two groups are compared.
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MT139C5.PPT 5 Population The entire group of individuals that we want information about. Examples:
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Mt139C5 - MTB > Describe 'Quiz3'. Descriptive Statistics...

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