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In business, investors are always interested in the tradeoff between returns and risk. Regression analysis is a statistical technique that can be used to quantify this risk. Explain the concept of dependent and independent variables in terms of a business performance indicator e.g. stock price, profits, etc., clearly stating the dependent and independent variables involved. If you wish, feel free to use non-business example in your discussion.
For the following hypothesis test where H 0 : m £10 vs. H a : m >10, we reject H 0 at level of significance a and conclude that the true mean is greater than 10 when the true mean is really 8.
using a significance level of .05, test the hypothesis that the intake of linoleic acid in this group is lower than that of the general population. Also, compute a p-value for the hypothesis test.
For a t distribution with 16 degrees of freedom, find the area, or probability, in each region.
A random sample results in 1 = 20 with n1 = 100. The population standard deviation is σ1 = 6. Another sample was selected independently resulting in 2 = 22 with n2 = 100. The population standard deviation is σ2 = 7. Test that the population means ..
Estimate with 95% confidence the mean reduction in time it takes for someone who has taken the sleeping pill to fall asleep.
Ten members of a fraternity take a statistics course. Here are their scores on the first exam in the course:
Create a 95% confidence interval for true mean debt for student borrowers.
Create a 90% confidence interval for mean score on this placement exam for all students.
You're a risk manager of ABC company and you are reevaulating your insurance contract. Your insurer has informed you that the expected value of frequency per month for ABC is 2.43.
Develop an appropriate forecast model for the given problem whereas the student population has remained constant during this period.
What is the break-even cost? What is the profit for 75 units of feed sold? How many units must be sold to produce a profit of $1020?
A researcher is interested in determining the partial correlation between age (X) and attitude towards interracial marriage (X), controlling for place of residence (rural or urban) (W).
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