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Question: Suppose you wanted to know if men or women students spend more money on clothes. You consider two different plans for carrying out an observational study:
Plan 1: Ask the participants how much they spent on clothes during the last 3 months; then compare the men and women.
Plan 2: Ask the participants to keep a diary in which they record their clothing expenditures for the next 3 months; then compare the men and women.
a. Which of these plans is a retrospective study? What term is used for the other plan?
b. Give one disadvantage of each plan.
Assume that results of survey were used to create seperate 99% confidence intervals for boys and girls. would the margins of error be same as, larger , or smaller than that for question one?
Identify a research question from your professional life, research interests, or everyday experience that could be addressed by this analysis.
a sample of 100 bugs yields an average weigh tof 7.7 ounces. assume the population st.dev is 0.8 oz what is the margin
If a Toronto teenager is chosen at random, what is probability that the teenager owns a skateboard or a bicycle?
What factor(s) in demographic segment can have significant impact on Oil and Gas Field Machinery and Equipment Industry of U.S.A. (SIC3533)?
Make a sketch that describes the treatments formed by combining dosage and method. Then use a diagram to outline a completely randomized design
1. the amount of tea leaves in a can from a particular production line is normally distributed with u 110 grams and o
First assume that at least one solution to the corresponding homogeneous equation is of the form . You may have to use some other method to find the second solution to make a fundamental set of solutions. Then use one of the two methods to find a ..
Perform a complete test of hypotheses to determine if there is evidence to claim the tires produced by Machelin wear out too fast. Include a P-value with the test.
Use the chi-square approach to test whether type of car owned (domestic or foreign) is independent of union membership. Test using an a = 0.05 level.
Taking Example into consideration, describe how the researchers might control for the effect of the initial severity of patient depression when they analyze.
For each of the 2 majors calculate the mean, median, minimum, maximum, range, and standard deviation for the columns 'Cost' and '30-Year ROI'.
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