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a group of five statisitcs students received the following grades on a test: 81,74,62,92 and 76. An intervention plan is used and the same students increased their scores on a retest to: 85,79,75,95, and 84. At the 0.05 significance level, is the intervention plan helpful in increasing grades?
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A study in which researchers measure or observe characteristics of the sample members
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69% of families say their children have an influence on their vacation plans. Construct a binomial distribution for a sample of 5 families who are asked if their children influence their vacation plans.
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You are carrying out a test of significance based on the test scores on a personality test of femininity scores of 148 male general manages of three-star and four-star hotels. You now realize that a confidence interval for the mean score of male hotel managers would be more informative than a...
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An IRS auditor randomly selects 4 tax returns from 58 returns of which 5 contain errors. What is the probability that the four she selects do not have errors?
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what data set violates chebyshev's rule?
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A recent article in USA Today reported that a job awaits only one in three new college graduates. The major reasons given were an overabundance of college graduates and a week economy. A survey of 200 recent graduates from your school revealed that 80 students had jobs. At the .02 significance...
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The expected value concept is important and used in Decision Analysis. Decision Analysis can help make decisions based on the probability of different sates of nature from occurring, with different events from each decision being assigned a monetary value. The analysis computes the expected...
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What are the steps espoused by the Applied Statistics in Business and Economics for formal hypothesis testing? Provide examples.
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A doctor knows that resting pulse is linearly related to systolic blood pressure, but knows that sometimes patients are nervous in doctor s offices, and the pulse and systolic blood pressure readings do not match the norm for that particular patient outside of the doctor s office. The...
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- 1. A school administrator wonders if students whose first language is not English score differently on the math portion of the sat exam than students whose first language is English. The mean SAT math score of students whose first language is english is 516 on the basis of data obtained from the college board. A simple random sample of 20 students whose first language is not English result in a sample mean SAT math score of 522. SAT math score are normally distributed with a population standard deviation of 114. Why is it necessary for SAT math scores to be normally distributed to test the hypothesis?
- 2. What are the steps espoused by Applied Statistics in Business and Economics for formal hypothesis testing? Why is the sequence important?
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