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A study from the 1970's examined the effects on ascorbic acid (Vitamin C) on the number and length of colds in study participants. There was a break in the double blind which invalidated the study. What happened?
-The investigators cheated-they knew who received ascorbic acid or placebo
-The participants could read which they received-the placebo or ascorbic acid through the thin paper of an envelope
-The randomization process was flawed
-The participants bit into the tablets and therefore know which treatments they received-the placebo or ascorbic acid
Compute descriptive statistics for each variable along with an explanation of what the descriptive statistics tell us about the variable.
An HMO is considering a marketing plan targeting patients with chronic diseases to increase the number getting a flu shot. Some preliminary analyses are conducted before implementing such a plan.
Present an example that illustrates the differences between replication and repeated measures.
You need to construct a 95% confidence interval estimate of the population mean for those who shovel snow. What value should you use for the standard error
Suppose that 1% of all people have a particular disease. A test for the disease is 99% accurate. This means that a person who test positive for the disease has a 99% chance of actually having the disease
Suppose the population mean is 50.6 pounds with a population standard deviation of 1.62 pounds. Suppose we take thousands of samples with a sample size of 5.
Question 1: A study was conducted to estimate μ, the mean number of weekly hours that U.S. adults use computers at home. Suppose a random sample of 81 U.S. adults gives a mean weekly computer usage time of 8.5 hours and that from prior studies, th..
What level of confidence did the statistician use in constructing this interval? Explain carefully, showing all steps in your reasoning. Hint: sample proportion is the midpoint of the stated confidence interval.
a contractor is considering a sale that promises a profit of 20000 with a probability of 0.7 or loss of 7000 with a
use exponential smoothing with 2 between 0.1 and 0.4 to get forecasts one period ahead for the following time series.
A distribution with m = 35 and s = 8 is being standardized so that the new mean and standard deviation will be m = 50 and s = 10. In the new, standardized distribution, your score is X = 45. What was your score in the original distribution?
Compute z-scores for both exams. Which class did she receive a better grade in? [Must show your work to get credit; Hint: See page 75 in your textbook]
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