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What test can be used to assess whether mean serum retinol has increased over 3 years among subjects in the vitamin A group. See table 10.33
One interesting aspect of the study described in problem 10.64 is to assess changes in other parameters as a result of supplementation with vitamin A. One quantity of interest is the level of serum triglycerides. Researchers found that among 133 participants in the vitamin A group (males and females combined) who were in the normal range at baseline (<2.13 umol/L) 15 were above the upper limit of normal at each of their last 2 consecutive study visits. Similarly, among 138 participants in the trace group who were in the normal range at baseline (<2.13 umol/L), 2 were above the upper limit of normal at each of their last two consecutive study visits.
What test can be performed to compare the percentage of participants who developed abnormal triglyceride levels between the vitamin A group and the trace group? Implement the test in Problem 10.68, and report a two tailed p value.
Using this information, calculate Beta risk (probability of Type II error) if the true population mean really is 77.
Write the linear regression equation to forecast father's education from mother's education?
A monthly report to the Texas Department of Health, division of Water Hygiene, contained the following water production data in thousands of gallons:
From the following information for Alfred Industries compute the overhead spending variance and the volume variance:
Constructing a scatter plot and determining correlation. a. display the data in a scatter plot, b. calculate the correlation coefficient f, and c. make a conclusion about the type of correlation.
An educational study uses a simple pre-post design to assess the efficacy of a computer tutor for solving inequalities. Twelve pilot students participate. Each student is given a pre-test, then participates in six sessions using the tutor, then i..
Show the decision rule graphically. Use the .05 significance level.
Determine mean and standard deviation for number of erroneous returns per batch.
The annual precipitation amounts in certain mountain range are normally distributed with a mean of 88 inches, and a standard deviation of 10 inches.
Determine the probability of choosing the area code at random which ends in the odd number if first digit cannot be 1 or 0?
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.
At a 5% level of significance, is there evidence to conclude that the mean life is different from 375 hours?
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