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Calculating the effectiveness of an educational intervention using a pretest-posttest design. I plan to run an ANCOVA on the scores with the pretest as the covariate. The six subcatagories on the test give the raw score of correct answers out of the total possible on each subcatagories. The overall score is given as a scaled score to equalize any differences on the pretest and posttest versions. The number of questions in each subcatagory and the overall test vary from the pretest and the posttest. Do I need to convert the scores to z scores to run the ANCOVA or can I use a percent score for each subcatagory and the scaled score for the overall score?
Ronald wants to sell his car through a broker who charges a commission of 10% of the selling price. Ronald still owes $11,025 on the car. Ronald must get enough to at least pay off the loan.
Camera, 28% had a music player, and 22% had both. What is the probability that a cell phone sold last month had a camera or a music plaer?
Suppose that it is a presidential election year and Ohio is one of the 'swing' states. Your polling company wants to conduct a presidential preference poll of the citizens of Ohio to predict which candidate will win the election.
the sampling distribution of the sample mean. use the central limit theorem to find the approximate probability that the mean number of flaws exceeds 1.8 per square yard.
Suppose that the risk of allergies for the children of nonsmokers is 0.15. What is the risk of allergies for the children of smokers?
A researcher used stepwise regression to create regression models to predict BirthRate (births per 1,000) using five predictors: LifeExp (life expectancy in years), InfMort (infant mortality rate).
What would that evaluation be and what is the margin of error?
What is the maximum likelihood estimate of μ? What is an approximate standard error of the maximum likelihood estimate?
The customer measured the tension of each and calculated the summary statistics. In order to conduct the test, the customer selected a significance level of Interpret this value.
In your environment (business or personal), please give an application of exponential smoothing and why you would use this technique.
As number sampled is large and those advocating a strike constitute over 50%, can we suppose that majority of all steelworkers favour a strike?
Population was computed to be 126.9 grams and the standard deviation was 1.20 grams. which food results in more uniform weight.
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