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A researcher, believing to π be no more than 0.40, calculates the necessary sample size for the confidence level and maximum likely error he has specified.
Upon completing the study, he finds the sample proportion to be 0.32. Is the maximum likely error greater than, equal to, or less than that originally specified? Explain.
A social worker is interested in estimating the average length of time spent outside of prison for first offenders who later commit a second crime and are sent to prison again.
What kind of a quasi-experimental design was used in this study?- What potential threats to internal validity are present in this design?
Ffinding that the mean sodium content is 324 mg, with a standard deviation of 35 mg. Find a 95 % confidence interval for the mean sodium content of this brand of hotdog.
Assume that a lot from product 5% non-conforming is submitted. Using Poisson Distribution compute the approximate probabilities that: the lot will be accepted and still in a reduced inspection.
Answer every part of each of the four questions on this exam. Show all of your work. You may earn partial credit for incorrect or incomplete answers if you show work that demonstrates appropriate statistical reasoning or the application of an app..
a hypothesis test for a population proportion p is given below ho p 0.25 vs. ha p ne 0.25 ne means not equal for
The width of the interval without the finite population correction factor is wider than the confidence interval with the finite population correction factor.
a firm seeks to receive a return of 12 on an investment of 100000. if potential profits are normally distributed with a
There are many nonparametric tests that have been developed over the years. Explain what nonparametric tests are and why they were developed.
Identify the number of conditions in a factorial design on the basis of knowing the number of independent variables and the number of levels of each independent variable.
One definition of a low-mileage car is one that is 4 years old and has been driven less than 45,000 miles. What percent of the cars returned are considered low-mileage?
Every year some student scores a perfect 1600. Based on this model, what would that student s residual be for her math score?
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