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Design an experiment to test the hypothesis that single-gender math classes are beneficial to adolescent females. Construct operational definitions of both the independent and dependent variables.
Your experiment should have two groups and use the matched pairs procedure. Make a good case for your selection of the matching variable.
In addition, defend your choice of either a posttest-only design or a pretest-posttest design.
Support your contention with three examples from your experience at other organizations or departments. Where applicable, for each example, indicate what are the treatments and blocking variables.
A psychologist is examining the influence of an older sibling in the development of social skills. A sample of 24 three year old children is obtained.
A simple random sample of 36 bulbs yields a mean lifetime of 504 hours. Construct and interpret a 99% confidence interval for the mean lifetime of all such bulbs.
Assume that an old used car fails to start 10% of the time. The other 90% of the time it drives for a time period which is uniformly distributed in the interval 20 to 30 minutes. In this interval all subintervals of time of equal width between 20 ..
a publisher wants to estimate the mean length of time in minutes all adults spend reading newspapers. to determine this
If a group of 10 printers is chosen at random from the store, find the mean and variance of the number of ink jet printers.
A random sample of 80 voters found that 44% were going to vote for a certain candidate. Find the 90% limit for the population proportion of voters who will vote for that candidate?
Best Ribs wishes to pay off a debt of $40,000 in 7 years. What amortization payment would they need to make each six months, at 6% interest compounded semiannually? (Use Table 12-2 from your text)
The heights of adults in one town have a mean of 66.3 inches and a standard deviation of 3.3 inches. What can you conclude from Chebychev's theorem about the percentage of adults in the town whose heights are between 59.7 and 72.9 inches..
Create a bar chart with an appropriate vertical axis, horizontal axis, and title - what your final chart should look like, although your titles and numbers will be different. Remove my example and insert your own.
Given the following values of central tendency for each distribution, determine whether the distribution is symmetrical, positively skewed, or negatively skewed:
In a randomized, double-blind, placebo-controlled trial of children, echinacea was tested as a treatment for upper respiratory infections in children.
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