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Depression A recent psychiatric study from the University of Southampton observed a higher incidence of depression among women whose birth weight was less than 6.6 pounds than in women whose birth weight was over 6.6 pounds. Based on a P-value of 0.0248 the researchers concluded there was evidence that low birth weights may be a risk factor for susceptibility to depression. Explain in context what the reported P-value means.
Why do you use the chi-square statistic? Explain. What type of data is used with chi square analysis? Explain. What are the hypotheses in a chi-square test for independence? Explain.
The analysis of variances produces df between = 3 and df within = 24. For this analysis, determine df total ?
Use the normal-theory method to test for significant differences in 12-month mortality between the two groups.
Use Bayes' rule to find conditional probability which Julianne is carrier, given that she and Jason have one child who doesn't have CF.
If we know that 20 people will attend, what price should be charged per person to break even?
Use this information to set up a 90 percent confidence interval for the proportion, p of all US workers who play hooky.
Each organization gets a 90% confidence interval. About how many of these intervals should cover the population average?
A Tamiami shearing machine produced 8 percent defective pieces. The quality control engineer has been checking the output by almost continuous sampling. What is the probability that in a sample of 9 pieces:
Suppose that the critical region for a certain test of hypothesis is of the form T greater than or equal to 2.5 and the computed value of T from the data is -2.75.
Insurance policy from company A costs $300 a year but guarantees to replace any losses due to theft. Create the decision tree.
A leasing firm claims that the mean number of miles driven annually, m, in its leased cars is less than 13280 miles. A random sample of 150 cars leased from this firm had a mean of 12584 annual miles driven.
The weights (in grams) of four different colors of M&M candies are given below, along with the mean weight and variance of each color, and the variance of the sample means.
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