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1) Binge drinking on college campuses has been a hot topic in the popular media and in scholarly research. Flett, Goldstein, Wall, Hewitt, Wekerle, and Azzi (2008) report the results of a study relating perfectionism to binge drinking. In the study, students were classified into three groups...
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At a certain university the mean income of parents of the entering class is reported to be $91,600. The president of another university feels that the parents income for her entering class is greater than $91,600. She surveys 100 randomly selected families and finds the mean income to be...
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The following are prices for a commodity from 2004 to 2006: 2004:$5 2005:$8 2006:$7 A. Calculate the simple price
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A government study claims that university students spend, on average, more than 100 each week on alcohol. To test this claim a sample of 25 students, revealed a sample mean of 105 spend each week on alcohol, with a sample standard deviation of 25. Do the data support the study's...
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what critical value t* from table D should be used to calculate the margin of error for a confidence interval for the mean of the population in each of the following situations?
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At a party there are 30 students over age 21 and 20 students under age 21. You choose at random 3 of those over 21 and separately choose at random 2 of those under 21 to interview about attitudes toward alcohol. You have given every student at the party the same chance to be interviewed: what is...
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Of 144 adults selected randomly from one town, 31 of them smoke. Construct a 99% confidence interval for the percentage of all adults in the town who smoke. (For intermediate calculations, use 2 decimal places for percentages or 4 decimal places for proportions.) 2) A) (15.9%, 27.2%) B)...
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Data collected over a long period of time showed that a particular genetic defect occurs in 1 of every 1000 children. Let X be the random variable number of children with genetic defect in a sample of 50,000 children examined . The records of a medical clinic show X = 60 children. [4] a....
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i need the answers to this case study
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What does y i dot bar mean?
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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?
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