The speed limit on interstate highways in the United States was reduced from 65 to 55 mile per hour in 1976. It was raised back to 65 in 1988; then in 1996 individual state governments could decide the limit and many raised it to 75 miles per hour
Proponents and critics of the law have looked at the number of traffic deaths per 1000 miles driven on the highways between 1970 and 1998 to see whether the law affected traffic deaths. What type of design is this?
A) one-shot case study
B) equivalent time-series design
C) pretest-posttest one-group design
D) interrupted time-series design
E) Solomon four-group design
D
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As a_____, a social worker needs to analyze which parts of the structure are activating stress in a given situation and then alter that structure so that equilibrium is again maintained
A) ?violence prevention specialist B) ?mental health consultant C) behavioral specialist D) ?systems change specialist
What is the mean of the following numbers? 28, 5, 17, 14, 17, 30, 51, 5, 17, 22
a. 5 b. 14 c. 17 d. 20.6
You can comfortably ignore assumptions about the normality of the distribution with the ttest and not worry about accuracy of the t-test if the assumptions are violated
Indicate whether the statement is true or false
In the pilot test of a data collection instrument, most research
participants checked "other" and wrote in widely varying answers to a fixed-alternative item. What should the researcher do? A. Create a composite index to measure the variable. B. Create a scale to measure the variable. C. Create an open-ended item to measure the variable. D. Delete the item. Do not attempt to measure the variable.