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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.
It seems that simulation could handle any situation or study. But is that always true? Discuss instances in which a simulation would be important and useful, and then a situation in which a simulation would not be appropriate.
At a .10 level of significance, use Stat Tools (or Excel) to test the sponsors' hypothesis. State the null and the alternative hypotheses and the decision rule. Finally, discuss your findings.
Community policing strategies have been useful in some jurisdictions to reduce crime. As Police Captain, you wish to run an experiment to see whether it will work in your city.
A coin is flipped e times and heads (h) or tails (t) are recorded:
Carry out test of independence to find out whether employee health insurance coverage is independent of size of company. Use α = 0.05 level of significance.
It has been evaluated that 30% of all farms are family-owned. In sample of 12 farms, determine the probability that exactly 3 farms are family owned?
We are interested in a 95% confidence interval for the population mean score. The margin of error associated with the confidence interval is?
From an inventory of 48 cars being shipped to local automobile makers, 12 have defective radios installed. What is the probability that one particular dealership receiving 8 cars will find 2 radios being defective? Make assumptions if necessary.
Assess the model fit for the multiple linear regression model using appropriate statistics and graphics.
If the population mean is estimated within two days, how many salespeople should be sampled?
Determine the lowest weight a student can have and still be qualified to enter the school.
25% of the residents garden. If 5% of the residents play poker and garden, find the probability that a resident plays poker, given that they also garden.
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