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The event {X2 ≤ y} is equivalent to what event involving X itself?
b. If X has a standard normal distribution, use part (a) to write the integral that equals P(X2 ≤ y). Then differentiate this with respect to y to obtain the pdf of X2 [the square of a N(0, 1) variable]. Finally, show that X2 has a chi-squared distribution with n = 1 df [see (4.10)]
Construct a 90% confidence interval for the above data Be sure to interpret this confidence interval in the context of this setting. State the null and alternative hypotheses in words and symbols. Compute the test statistic
for a standard normal probability distribution find the percentage of data that area within 1 standard deviation of the
A physician's health study of the effectiveness of aspirin in the reduction of heart attacks was begun in 1982 and completed in 1987. Of 11,037 male medical doctors in the United States who took one 325 mg buffered aspirin tablet every other day
What measure of central tendency is most sensitive to skewness and which is least sensitive? What are measures of central tendency used for? What are measures of dispersion used for?
An independent testing services road-tested 36 of the automobiles.
What is the expected total activity time in weeks for each of the five separate paths through the network? What is the critical path for the network and associated overall project completion time in weeks?
Do you think this statement has any merit? Why or why not? Explain why the manager may have said it and then further substantiate his argument or compose a rebuttal.
a fair coin is flipped until heads or tails have occurred twice in a row. find the expected number of flips. show all
Create a 95% confidence interval for the value of the population mean, given that their are 64 observations and a sample mean of 49, with a sample standard deviation of 3,test the hypothesis with an alpha equal to .05
if z is a standard normal random variable then what is przgt-2.43? use four decimal places of accuracy.can you also
here are the golf scores of 12 members of a college womens golf team in two rounds of tournament play. a golf score is
Use traditional hypothesis test approach. Draw a graph showing the test statistic and critical values. Assume the population has a distribution that is approximately normal and that the sample is a simple random sample.
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