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A simple random sample of 25 seniors from a large metropolitan area school district had a mean Math SAT score of 450 (sample mean). Suppose we know that the standard deviation of the population of Math SAT scores for seniors in the district is 100 (sigma). A 90% confidence interval for the mean Math SAT score mu for the population of seniors is what? (Assume the population of Math SAT scores for seniors in the district is approximately normally distributed.
Consider following data on exam scores of 10 randomly selected students: Compute 3rd quartile of the exam scores.
The local operations manager for the IRS must decide whether to hire 1, 2, or 3 temporary workers. He estimates that net revenues will vary with how well taxpayers comply with the new tax code.
What can we conclude from these figures at a level of significance of .01?
The sample mean is 50, the t-critical value is 1.96, and the standard error of the sample mean is 2.
Consider the relationship between derived scores and the normal curve. In terms of the normal curve and how it relates to psychological testing and assessment.
Weight of the .5 cubic yard bag of landscape much is normally distributed with mean of 40 pounds and standard deviation of 1. Determine the probability that the bag will weigh more than 40 pounds?
College students are a major target for advertisements for credit cards. At a university, 65% of students surveyed said they had opened a new credit card account within the past year.
A researcher has reason to believe that, for an experiment with 50 points, a 95% prediction interval would be of width 4. If the researcher wishes to run a more precise experiment that will result in a 95% prediction interval of width 2, then the ..
In regards to the statistics paper you helped me with. Can you do a conclusion of the findings. I can edit it to my communication style, but I do need to do the following:
What is the probability of winning if the rules are changed so that in addition to selecting the correct five numbers, you must now select them in the same order they are drawn?
If 49 participants (49 = size of the sample) are chosen randomly, what is the probabilty that their mean spent amount will be in $6 of population mean? (mean+/-6).
Suppose that 10 years ago the average annual expense for stock funds was 1.19 percent. Let µ be the current mean annual expense for all stock funds, and assume that stock fund annual expenses are approximately normally distributed.
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