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In order to estimate the proportion of families who prefer female baby-sitters to male baby-sitters with an error of at most 8 percentage points and with at least 95 percent confidence, how large a sample should be taken?
Compare and contrast internal and external validity. Describe and give examples of research questions for which external validity is a primary concern.
Write up your results by using scientifically recognized form.
We often hear you can lie with statistics. This is one way of saying statistics can be easily mis-communicated. Find one example of how statistics are mis-communicated and explain why there was a mis-communication and what you would do to correct ..
An electronic circuit board fails randomly with failure rate of λ=0.00021 /h. When it fails it is replaced by a new board.
The correct set of hypotheses to test the effect of the bonus plan, the difference between the t and z distributions
LSAT scores are normally distributed, with a mean of 150 and s = 10.
Find out the following probabilities. Probability that exactly 27 items will be good.
Using Sally's estimate of demand that follows, how many T-shirts should she produce for the upcoming event?
For the past 20 years, the high temperature on April 15th has averaged (j = 62 degrees with a standard deviation of a = 8. Last year, the high temperature was 66 degrees.
Find a 90% confidence interval for the mean amount left by all groups.
Create the table for frequency distribution that has 16 class intervals of width 1 inch. Utilize 61.5 inches as lower limit of first interval and 62.5 as upper limit.
Construct a 95 percent confidence interval for the true mean.
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