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A cross over trial is conducted to compare an experimental medication for migraine headaches to a currently available medicine. A total of 50 patients are enrolled in the study and each patient receives both treatments. The outcome is the time in minutes until the headache pain resolves. Following each treatment, patients record the time it takes until pain is recorded. Treatments are assigned in random order (i.e., some patients receive the currently available medication first and then the experimental medication, and others receive the experimental medication first and then the currently available medication). The mean difference in times between the experimental and currently available medication is -9.4 minutes with a standard deviation of 2.8 minutes. Construct a 95% CI for the mean difference in times between the experimental and currently available medication.
If the power plant of this city has a daily capacity of 12 million kilowatt hours what is the probability that this power supply will be inadequate on any given day.
Assume that replacement time for TVs are normally distributed with a mean of 8.2 years and a standard deviation of 1.1 years. The probability a randomly selected TV will have replacement time less than 5.5 years to be .0071.
Determine the point estimate and 95% confidence interval for the mean family dental expenses of all employees of the company.
Find a research article and clearly define both the null and directional hypothesis that was or could have been tested during the statistical analysis of the data.
What is the probability that the income is between $1,000 and $1,800? (Be able to draw a graph to illustrate your results)
Suppose it is known that if you offer free samples o a product, at least 52% of adults are more likely to buy the product. You interview a random sample of 50 adults.
A supermarket advertises that the waiting time spend by customers waiting in line at the cash register is uniform between 0 and 6 minutes.
To test whether or not there is a difference between treatments A, B, and C, a sample of 12 observations has been randomly assigned to the 3 treatments. You are given the results below.
In government data, a household consists of all occupants of a dwelling unit, while a family consists of two or more persons who live together and are related by blood or marriage. So all families form households, but some households are not famil..
Suppose the least squares regression equation is Y' = 1,202 + 1,133X. When X = 3, what does Y' equal?
Give an example of a hypothesis test. State what the Null and the Alternative hypotheses.
According to a report by Scarborough Research, the average monthly household cellular phone bill is $73. Suppose local monthly household cell phone bills are normally distributed with a standard deviation of $11.35.
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