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The midterm scores in Statistics 101 had a mean of 72 and an SD of 12. The exam scores in Psychology 101 had a mean of 72 and an SD of 20. For both exams, the scores followed the normal curve.
Both instructors gave the top 10% of the scores A's, the next 25% B's, and the next 40% C's.
John earned a score of 89 on both exams. On which exam did John receive the higher letter grade?
What was the minimum exam score required for a B in Statistics? What was the minimum exam score required for a B in Psychology?
expectation of the statistic that was proposed by Statistician - Based on the information collected in Tasks 1-8, which of the two statistics produces values which tends to be more concentrated about the expectation of the measurement?
Eighty-eight shoppers were interviewed at random, and 59 said that they prefer to shop alone. What is the value of q-hat?
Births. Randomly selected births records were obtained and results are listed in the table below (based on data from the National Vital statistics Report,
Forecasting: The sales data for the lone star Sports Apparel Company for the last 12 years are as follows: What is the 2001- 2012 compound growth rate?
Consider the continuous random variable X, which has a uniform distribution over the interval from 20 to 28. The probability that X will take on a value between 21 and 25 is.
A study reported in "Inside Higher Education News" (May, 2006) found that financial incentives can improve low-income college students' grades and retention.
A corporate CEO reviews the earnings of three divisions over the last eighteen months. Each division reports its earnings quarterly.
Which supplier and which shipping quantity will provide the lowest costs for Eight Flags and Which supplier and shipping quantity will provide the lowest total cost for Horizon Cellular?
Assume that each of the following studies cannot be analyzed using a parametric procedure. For each of the following studies (below), indicate the appropriate nonparametric procedure, and explain why you chose it.
According to accountemps inc. 48% of all executives believe that employees are most productive on Tuesdays. a random sample of 200 executives is taken for a study.
Compute the proportion p (hat) for your sample Show your computation. Find a 95% confidence interval for p. What is the margin of error in this confidence interval? What is the meaning of this interval with respect to your data and project?
An instructor claims the average time to take a statistics test is greater than 39 min. As, if a sample of 33 students took 43 min. is the instructor's claim true?
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