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Dr. Justin Case wants to explore whether or not students perform better if they cram for a test (massed practice) or if they space their studying over weeks (distributed practice). The massed practice group studies for 8 hours the night before a quiz; the distributed practice group also studies for 8 hours, but does it in 2-hour blocks the four days before the quiz. The dependent variable is the number of errors made by each pair of subjects. Each pair of subjects is matched for intelligence level. The results are given below. Decide which statistical test would be appropriate for these data, carry out the test, and evaluate the outcome. Assume that the researcher has chosen a p < .01 level of significance and that the direction of the outcome has not been predicted (adapted from Myers & Hansen, 1997, p. 374).
MassedDistributed
S1: 6
S1: 5
S2: 4
S2: 3
S3: 3
S3: 2
S4: 5
S4: 2
S5: 2
S5: 3
The second number in the set is the distributed.
At.01 level of significance, is proportion of seeds which germinate dependent on seed type?
Calculate the average of deposits per bank for FDIC- inured institutions during both time periods and describe the relationship between the two averages. Provide a reason for the difference.
Although the rules of probability are just basic facts about percents or proportions, we need to be able to use the language of events and their probabilities.
Identify each of the following variables are qualitative or quantitative
Construct a 95% confidence interval estimate of the population mean life of the light bulbs.
The security department of a state university is planning its budget for the next year. In estimating the man-hours for security during university sponsored music concerts, the average length of music concerts is needed.
We recalculated our comparison of ideal number of children, this time only for women, separating them into two groups, those who indicated that they were "very happy" or "not at all happy" with life.
Listed below is the selling price for a share of Coca Cola, at the close of the year. Determine the least squares trend equation.
Explain the relationship between sample size and the likelihood of a statistically significant difference between the measured values of two groups.
Many investigaters have studied the relationship between asbestos exposure and death from chronic obstructive pulmonary disease (COPD)
A study of 100 sedentary people in this age group is planned to test whether they have a higher or lower level of plasma glucose then the general population.
a) Test whether there is a difference between attitudes in the 2 cities. Use a 95% alpha. b) What does your result say about attitude consistency across cities?
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