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The serum concentration of free T3 (a thyroid hormone) among people between the ages of 30 and 60 is normally-distributed with mean 4.6 pmol/liter and standard deviation 0.5 pmol/liter.
A medical researcher plans a study where she will select a random sample of 16 people between the ages of 30 and 60, and measure their serum concentration of free T3.
A. What is the z-score associated with a sample mean of 4.8 pmol/liter?
B. What is the probability that the sample mean of the 16 people will be more than 4.8 pmol/liter?
C. If the researcher wants to be certain that half of her sample is male and half is female, what type of random sampling scheme should she use?
There is a fixed cost of $50,000 to start a production process. Once the process has begun, the variable cost perunit is $25. The revenue per unit is projected to be $45. Write a mathematical expression for total cost.
What is the critical value - what is the test statistic and What are the null and alternative hypotheses?
For each of the following questions, draw a diagram of a distribution curve and show your calculations. Always round to the nearest fourth decimal place.
Each of the variables in this analysis was measured by having the students complete a questionnaire. Discuss how this might affect the results. How well do you think that these results can be applied to other populations of high school students?
State the null and alternative hypotheses
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(a) What would be the appropriate hypothesis test to use to test the claim that monetary incentives reduce water usage?
Suppose an exam consisted of 10 multiple choice problems, each with five possible responses (A-E), only 1 of which is correct.
A simple random sample of kitchen toasters is to be taken to determine the mean operational lifetime in hours. Assume that the lifetimes are normally distributed with population standard deviation hours.
In 1969, Ken Thompson of AT&T Bell Labs was looking for a computer to create what, eventually, became the fi rst Unix system. He found an unused PDP-7 minicomputer, which he was able to use. Suppose Thompson had not found the PDP-7. Would we have ..
a statistics professor finds that when she schedules an office hour for student help an average of 3.7 students arrive.
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