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When computing a t-test, it is important to distinguish between directional and nondirectional hypotheses as the direction will determine the rejection regions. Describe how the rejection regions would differ according to the type of hypothesis you would use.
An insurance company asks you to determine whether older drivers are safer than younger ones.
Provide a directional hypothesis related to this study. Then, explain how you would need to change the hypothesis so that it would be non-directional. What happens to the rejection regions and why? Which of the two hypotheses do you think is more appropriate and why?
Are the events "Republican" and "30-44" independent? Justify your answer. Are the events "Democrat" and "65+" independent? Justify your answer.
A random sample of 100 students at Southern University was collected. The mean age was found to be 24.2 years, with a standard deviation of 3.4 years.
What is the probability that a simple random sample of 40 male graduates will provide a sample mean within $10,000 of the population mean, $168,000 (to 4 decimals)?
A recent census of a small town in Michigan showed that 60% of the residents are male, 20% have college degrees, and 15% are both male and college graduates.
Find the minimum amount of water pumped in 30 days. Let y be the total number of gallons pumped x days after pumping being. Note that (0,0) is on graph of the equation.
An experiment involves rolling a fair six-sided die repeatedly. How many times must the die be rolled for a {6} to result at least once with probability greater than or equal to 0.6 ?
Use a 0.05 significance level to test the claim that king-size cigarettes with filters have a lower mean amount of nicotine than the mean amount of nicotine in non-filtered king-size cigarettes.
Two t-curves have degrees of freedom 12 and 20, respectively. Which one more closely resembles the standard normal curve? Explain your answer.
Develop a linear regression equation for the given data and forecast how much money Robert will win if he spends $30.
You have been given a report that presents two regression models with different numbers of independent variables. You do not have the data so you cannot re computed regression models. Nevertheless, you have been asked to find out which model is b..
What statement can you made by using the rule of three, about the proportion p, of all its computers which are defective?
Assuming that the Poisson distribution is a plausible model in describing variability of asbestos fiber counts in filters; derive a 95% confidence interval indicating the variability in the average number in asbestos fibers.
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