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Question: If you wish to estimate a population mean with a sampling distribution error SE = 0.28 using a 95% confidence interval and you know from prior sampling that sigma^2 is approximately equal to 5.4, how many observations would have to be included in your sample?
Let X1, ..., Xn be a random sample from a two-parameter exponential distribution, Xi ~ EXP (theta, eta). (a) Assuming it is known that eta = 150, find a pivotal quantity for the parameter theta based on the sufficient statistic.
Construct a 95% confidence interval for the population mean.
Using the .05 significance level, can we conclude that there is a positive association between the two variables?
Determine the probability that no female are hired. Determine the mean and standard deviation of X.
If a proposal evaluator randomly selected two proposals, what is the probability that both of them met the specified?
Make a decision using the p-value approach at the given α = 0.05.
If an apartment is selected at random, what is the probability that it is not a 2 bedroom apartment on the 2nd floor?
A sample of 10 persons is used to measure the effectiveness of two massage techniques. The effectiveness of the techniques is measured by the number of days that pass by before the subjects feel the need for another massage session.
Let X 1 , X 2 , X 3 , X 4 be a random sample from a Poisson distribution with parameter λ and let Y = X 1 + X 2 + X 3 + X 4 . You decide to test λ = 1.60 versus λ
Which of the given experiments can be modelled by Poisson distribution?
For the following hypothesis test where H 0 : m £10 vs. H a : m >10, we reject H 0 at level of significance a and conclude that the true mean is greater than 10 when the true mean is really 8.
The number of items rejected daily by the manufacturer because of defects for last 30 days are:
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