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An offspring of a grey cat is grey with probability 0.6 and white with probability 0.4. An offspring of a white cat is grey with probability 0.2 and white with probability 0.8. Rex is a white cat. Compute the probability that his grandchild is grey.
A sample of 60 smokers has a mean cotinine level of 125. Assuming that sigma=25, find the 90% confidence level estimate of the mean cotinine level of all smokers.
Draw a normal probability plot for residuals using excel or Minitab. Do the residuals seem normally distributed? If yes, why?
A researcher hypothesizes that parents with school-aged children are more probable to vote in favour of a referendum increasing public school spending than adults without school-aged children, but wonders of this relationship holds for both Democr..
a researcher would like to evaluate the claim that large doses of vitamin c can help prevent the common cold. one group
When an experiment is conducted, one variable is manipulated to see the impact on another variable -- that's why experiments address causation.
How might you design an experiment that will effectively collect data for this chosen hypothesis? How will you minimize threats to validity? Will it be a true experiment or a quasi-experiment?
1.a study was conducted to explore the relation between alcohol consumption and hypertension. 7400 nurses were surveyed
Normally distributed with a mean of $70,000 and a standard deviation of $20,000. Twenty percents of the loans are larger than what amount?
Camera batteries has a standard deviation of 2.1 months. Assume the variance is normally distributed. Do you fell that the lifetimes of the batteries are relatively consistent?
Confirm that these statements are accurate by finding the geometric mean rate of increase.
You are running a chi-squared test. You have 2 groups with 3 characteristics each, what would your critical value be with an alpha of .025?
in studies for a medication 13 percent of patients gain weight as a side effect. suppose 514 patients are randomly
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