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There is about 80% chance that a randomly chosen person aged 20 will still be alive at age 65. Suppose we randomly select fifteen 20 year olds. What is the chance that at least 12 of the 15 persons are still alive at age 65?
Systolic blood pressure are mesaured at baseline and again 4 weeks later. Computed 95% confidence interval for the mean difference in blood pressure over 4 weeks.
Provide an overview of the problem you identified. What are some research components that could be measured in order to address the research question or hypothesis you identified? How might a researcher obtain that information?
It has been reported that 80% of taxpayers who are audited by the IRS end up paying more money in taxes. Assume that the auditors are randomly assigned cases and that one of the ways the IRS oversees its auditors is to monitor the percentage of ca..
Has there been a significant decrease in the proportion of students who change their major after the first year in this program? Test at the .05 level of significance.
Basic concepts. For each of the following, answer the question and give a short explanation of your reasoning.
Psychologists once measured 77 variables on a sample of schizophrenic people and a sample of people who were not schizophrenic. They compared the two samples using 77 separate significance tests.
What are the values for the Mean Square Treatment (MST) and the Mean Square Error (MSE)? Compute the value of F. Do you Reject or Fail to Reject the Null Hypothesis? State you conclusion.
Month is uniformly distributed between 2 and 12. Find the probability density function and the cumulative distribution function of x.
In the Arnold's Muffler example for the exponential distribution, the average rate of service was given as 3 per hour, and the times were ex-pressed in hours.
Determine the mean number of times the machine was used per day.
When adding or subtracting expressions, how do you identify the like terms?
A research team conducted a study of soft-drink preferences among residents in a test market prior to an advertising campaign for a new cola product.
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