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An actuary determines that the claim size for a certain class of accidents is a random variable, X, with moment generating function
MX(t) =1/(1 - 2500t)4
Determine the standard deviation for the claim size for this class of accidents.
An experiment is designed to test the potency of a drug on 20 rats. Previous animal studies have shown that 10-mg dose of the drug is lethal 5% of the time within the first 4 hours; of the animals alive at 4 hours, 10% will die in the next 4 hours..
a student takes a 20-question multiple choice exam and guesses on each question. each question has 4 choices only one
q1. a normally distributed population has a mean of 40 and a standard deviation of 12. what does the central limit
Does drug have significant effect on aggression? Use an alpha level of .05, two tails.
Determine the probability distribution for X defined as number of defective items drawn (Hint: You have to determine P(X=0), P(X=1) and P(X=2).
Known population of 1000 students to construct a 95% confidence interval for teh average SAT score. What correction factor should be used to compute the standard error?
Suppose the age of buyers were collected and the data follows the bell curve (a normal distribution). The buyers had an average age of 47 years and a standard deviation of 5.
Based on these results a confidence interval extending from 5.96 to 6.16 was calculated for the population mean. Find the confidence level of this interval.
If sensitivity and specificity remain constant, determine the relationship of prevalence to predictive value positive and predictive value negative?
A random sample of 64 light bulbs indicates a sample mean life of 350 hours. Construct a 95% confidence interval estimate of the population mean life of the light bulbs.
What is meant by an independent sample? What is a related sample? When should researchers use different hypothesis tests for independent and related samples?
identify a pair of variables for which you would expect to see a strong correlation but not a cause-and-effect
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