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A researcher wishes to see if there is the difference in cholesterol levels of two groups of men. Random sample of 30 men between ages of 25 and 40 is selected and tested. Average level is 223. Second sample of 25 men between ages of 41 and 56 is selected and tested. Average of this group is 229. Population standard deviation for both groups is 6. At α = 0.01, is there difference in cholesterol levels between two groups? Determine 99% confidence interval for difference of two means.
Develop a trend line for the demand for fertilizer using computer software. Data collected on the yearly demand for 50 pound bags of fertilizer at Wallace Garden Supply are shown in the following table:
Critically discuss the characteristics of integer programming problems. Provide specific instances in which you would use an integer programming model rather than an LP model. Provide real-world examples.
A human factors psychologist studied three computer keyboard designs.
Decision making under risk is the same as decision making under uncertainty because in both the probabilities are unknown.
One professor teaches a large section, section A, of a particular class, and on the first test of the term, the test scores in section A were approximately normally distributed with a mean of 78 and a standard deviation of 6.
Twelve cases of leukemia are reported in people living in a particular census tract over a 5-year period. Is this number of cases abnormal if only 6.7 cases would be expected based on national cancer-incidence rates?
Some people who bought X-game gaming systems complained about having received defective systems. The industry standard for such systems has been 98% non-defective systems.
An analysis of variance was used to evaluate the mean differences from a repeated-measures research study. The results were reported as F(3,24)=6.40.
Using an alpha of .05, what can you conclude about homogeneity of variance from the output? Word process your responses on the SPSS output pages.
Suppose that a random sample of 800 early replacement buyers yields a mean number of dealers visited of 1 = 3.3, and that a random sample of 500 late replacement buyers yields a mean number of dealers visited of 2= 4.5.
CAPM and Expected return. If the risk-free rate is 6 percent and the expected rate of return on the market portfolio is 14 percent, is a security with a beta of 1.25 and an expected rate of return of 16 percent overpriced or under priced?
What linear transformation will change sixth grade scores x into new scores xnew= a+bx that have the desired mean and standard deviation?
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