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For a certain standardized placement, it was found that the scores were normally distributed, with a mean of 200 and a standard deviation of 30. Suppose that this test is given to 1000 students. What is the number of students that are expected to make scores between 170 and 230?
For the population with mean of (u)=50 and standard deviation of (o)=10, how much error on average would you expect between sample mean (M) and population mean for given samples
Statistical Hypothesis testing - Frequency distribution
Can we conclude from this that most workers there earn between $25 and $35 per hour? Is this the right interpretation for the margin of error?
When studying the simultaneous responses to two categorical questions, we should set up a:
Critically discuss some reasons that business outputs vary? For example why does production output vary? Explain the difference between common causes of variation and special causes of variation.
Calculate (rounded to the nearest tenth) The correlation between IQ and Anxiety r =??
Calculate the Mean, Median, Mode, Range and Standard deviation of this sample. Show Calculations: Use any calculation method desired
The engineers hoped to base their decision on the reactions of 50 drivers, but time and budget constraints may force them to cut back to 20. How would this affect the power of the test? Explain.
Researchers at the Cornell University Food and Brand Lab conducted an experiment at a fitness camp for adolescents (Wansink & van Ittersum, 2003).
You run a two tail t-test. The critical value for this test at the .05 level is a t of 7.82. What value must the obtained t-test statistic be in order to be considered significant at the .05 level?
Calculate probability that the sample would have a mean:
A human society claims that less than 31% of U.S. households own a dog. In a random sample of 392 U.S. households, 155 say they own a dog. At a=0.03, is there enough evidence to support the society's claim?
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