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The MBA department is concerned that dual degree students may be receiving lower grades than the regular MBA students. Two independent random samples have been selected 250 observations from population 1 (dual degree students) and 210 from population 2 (MBA students). The sample means obtained are X1(bar)=83 and X2(bar)=86. It is known from previous studies that the population variances are 4.6 and 5.0 respectively. Using a level of significance of .05, is there evidence that the dual degree students are receiving lower grades?
Group 2 data [ 141, 139, 172, 131, 150, 125. Assume normal distribution, with equal variance in the two groups and conclusion for a=0.05.
What is the alternative hypothesis for a null hypothesis stating that the average time a person keeps a cell phone is, at most, three years?
The last lessons have spent a lot of time describing the slope and intercept terms (and their variances) of the one-variable sample regression function.
Developing project network using AOA that determines completion times.
Scores on a test have a mean of 73 and Q3 is 81. The scores have a distribution that is approximately normal. Find P90.
Typically, these children must have IQ scores in the top 5%. What is the minimum score to qualify a child for these programs?
Where should the warranty limits be set so that only 10% of the TVs need repairs at the manufacturer's expense?
Neither married nor a college graduate? (answer should be a probability, that is, a number between 0 and 1). Married but not a college graduate? (answer should be a probability, that is, a number between 0 and 1).
Machine X test unit cost $3000 with beta=3 and theta=500, Machine Y test unit cost $2000 with beta=3 and theta=400. If the machines oil fixtures has life of 20 hrs, which machine goes to market first?
Suppose that X1,..,Xn form a random sample from the normal distribution with unknown mean M and unknown standard deviation S, and let m and s denote the MLEs of M and S. for the sample size n=17, find a value of k such that P(m > M +ks) = 0.95
Car Emissions: Listed below are measured amounts of greenhouse gas emissions from cars in three different categories. The measurements are in tons per year, expressed as CO2 equivalents.
Tompkins Associates reports that the mean clear height for a Class A warehouse in the Unites States is 22 feet. Suppose clear heights are normally distributed and that the standard deviation is 4 feet.
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