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we wish to design a study to assess risk factors for stroke and dementia. there are two primary outcome measures. the first is a measure of neurological function. patients with "normal" function typically score 70 with a standard deviation of 15. the second outcome is incident stroke. in patients over the age of 65 approximately 14% develop stroke over 25 years. how many participants over the age of 65 must be enrolled to ensure the following?
A. That the margin of error in a 95 % confidence interval for the difference in mean neurologic function scores between men and women does not exceed 2 units.
B. That we have 80% power to detect a 20% reduction in incidence of stroke between participants who participate in a healthy aging program as compared to those who do not. assume that the incidence of stroke is 14% in those who do not participate. Assume the incidence is 14% in group who do not participate and 20% lower (i.e 11.2%) in the group who participate.
In order to do so, they review 42 service calls and construct a 95% confidence interval for population mean: (2.468, 2.743). What can we conclude about the significance test of Ho: mu = 2.6 vs Ha: mu does not equal 2.6?
the mean salary for the clearing department at ameriprise financial is 42000.00 with a standard deviation of 8000.00.
Create a frequency distribution and histogram for this variable, and calculate the mean, median, and standard deviation. Describe how BankTen compares with other banks in terms of profits per employee.
The Ludlow Wildcats baseball team, a minor league team in the Cleveland Indians orgainzation, plays 70 precent of their games at night and 30 percent during the day.
Suppose that the null hypothesis is rejected and alternate hypothesis is accepted. Discuss the conclusion as a Type I error, a Type II error, or a correct decision, if in fact the defendant is innocent.
Suppose 1.5 percent of the antennas on new Nokia cell phones are defective. For a random sample of 200 antennas, find the probability that:
Annual family dental expenses for the families of a random sample of ten employees of a company are given below. You can assume the family dental expenses for the employees of the company are normally distributed.
of federal taxpayers who itemize their deductions and have adjusted gross incomes between 35000 and 50000 the dollar
During 2001, 61.3% of US households purchased ground coffee.These households spent an average of $36.16 on ground coffee during the year.
There is a worker error is 0.3, and the probability that an accident will occur when there is no worker error is 0.2. Find the probability of a worker error if there was an accident.
Suppose a single die is rolled once. You win $5 if a 1 or a 3 comes up, win $12 if a 5 comes up and lose $10 if a 2, 4, or 6 come up. What does the expected value tell you about the game?
question suppose that the medium coffees sold by a certain coffee shop have a mean volume of 16 ounces and a standard
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