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University of Maryland University College is concerned that out of state students may be receiving lower grades than Maryland students. Two independent random samples have been selected: 165 observations from population 1 (Out of state students) and 177 from population 2 (Maryland students). The sample means obtained are X1(bar)=86 and X2(bar)=87. It is known from previous studies that the population variances are 8.1 and 7.3 respectively. Using a level of significance of .01, is there evidence that the out of state students may be receiving lower grades? Fully explain your answer.
consider a class in which there are 40 students enrolled. in what follows ignore february 29tha john is a student in
To examine the effectiveness of its four annual advertising promotions, a mail order company has sent a questionnaire to each of its customers, asking how many of the previous year's promotions prompted orders that would not have otherwise been made.
describe the sign test. what types of hypotheses is it used to test? what is the underlying
A random sample of five accidents resulted in the following number of persons injured: 18, 15, 12, 19, & 21. Using the .01 significance level, can we conclude the population mean is less than 20 for all accidents?
Approximately 65% of all marketing personnel are extroverts, whereas about 50% of all computer programmers are introverts.
when circuit boards used in the manufacture of compact disc players are tested the long-run percentage of defectives is
Estimate the true proportion of the incomplete files for All the bank's commericial loans. Write a statement about the confidence level and the interval you find.
If 50 cups of coffee were measured, what is the probability that: The sample mean per cup is less than 7.8 ounces?
1.a pediatrician is interested in studying the effect of motrin on reducing temperature in young children. four
What is the probability that no more than two of the three are commercial successes?
you want to know if redesign of the new whole foods has significantly increased sales. you sample 25 customers who shop
Mothers did not take the drug DES during pregnancy , what is the estimate of the number of women out of 1000 who would be expected to have tissue abnormalities?
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