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The data set vitamin .txt contains the results of a study on vitamins. Three groups of test subjects each received a different treatment (three different vitamin formulations). Each subject's calcium levels before and after treat ment were recorded.
(a) To reduce bias in the experiment, the subjects should have been assigned a treatment regimen at random.
i. Explain what this means.
ii. Using just the "before" calcium levels, how could we check if any obvious non-random assignment was used?
iii. Perform this check, and comment on the results.
(b) Make separate scatter plots for the three sets of data.
(c) Write a report summarizing the experiment and its results.
Now compute the standard deviation for this distribution.
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The standard deviation of the monthly growth rates will remain 60%. Is the increased investment growth worth the consulting fee?
State the decision rule, compute the pooled estimate of the population variance, compute the test statistic, and state your decision about the null hypothesis and estimate the p-value.
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A random sample of 50 engineers of a large technology company that the sample mean is 34.4 year. assume that the population standard deviation is 8 years.
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