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The department at a university is concerned that dual degree students may be receiving lower grades than the regular MBA students. Two independent random samples have been selected. 100 observations from population 1 (dual degree students) and 100 from population 2 (MBA students). The sample means obtained are X1(bar)=85 and X2(bar)=88. It is known from previous studies that the population variances are 4.0 and 5.0 respectively. Using a level of significance of .10, is there evidence that the dual degree students are receiving lower grades? Fully explain your answer.
City government has collected the following data on annual sales tax collections and new car registrations: Determine the least squares regression equation.
A standard deviation of 7.3 years. What is the 95% confidence interval estimate for the average number of years served by all Supreme Court justices?
Conduct a one-tailed hypothesis test given the information below. A certain brand of Green Energy light bulbs was advertised as having an average illumination life-span of 2,500 hours.
The mean number of passengers per cruise is 1,820 and the standard deviation is 120.
Use the significance level of alpha = .05 to test claim that p > .5. Sample is simple random sample n = 50. Illustrate how to compute beta for test and suppose true population proportion is .6.
Calculate a 95 percent confidence interval for the population mean audit delay for all public owner-controlled companies in New Zealand.
The mean starting salary for college graduates in the spring of 2000 was$31,280. Assume that the distribution of starting salaries follows the normal distribution with a standard deviation of 3,330.
In a normal population with sigma=20, a random sample of size n gave X(mean)=56.53. At the 5% significance level, make a two-tailed test of the null hypothesis mu=50, when (a) n=24 (b) n=36
What is the probability that more than 88 cartons arrive in at least 5 of the next 6 months given normal distribution with mean of 80 cartons per month and standard deviation of 7 cartons per month?
Upon reviewing the accounting records from the restaurant, you discover that it grosses roughly $3000 per day on 6 out of 10 days. Determine the estimated probability that the restaurant will gross over $3000:
Find out the probability that at least one of the CD's is defective?
They wish to conduct a survey of their students and find a simple random sample of 50 Freshmen, 40 Sophomores, 35 Juniors, and 30 Seniors.
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