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When the null hypothesis is rejected in the goodness-of-fit test, it means there is close agreement between the observed and expected frequencies.
If we assume that the lifetime of this type of bulb has a standard deviation of 400 hours, can we conclude at the 5% significance level that the claim is true.
A small town has a population of 20,000 people. Among these 1,000 regularly visit a popular local bar. A sample of 100 people who visit the bar is surveyed for their annual expenditures in the bar.
What is sampling error? Could value of sampling error be zero? If it were zero, what would this mean?
What is the likelihood the sample mean is greater than $22.50 but less than $25.00?
The sample information is reported below. At the .10 significance level can we conclude that there is a difference in the amounts quoted?
Use a two proportion z-test to perform the required hypothesis test. State the conclusion.
The mean is a useful measure, but it can be misleading. Describe a circumstance when the mean is very useful as the average and a circumstance when the mean is very misleading as the average.
Below you are given a partial computer output based on a sample of 16 observations.
If random sample of 9 loads is selected for a weight check, determine the probability that mean weight of those loads is more than 40.60 tons.
Computing the mean and standard errors of sampling distribution - Using the central limit theorem, find the means and standard errors of sampling distributions
Five cards are drawn from an ordinary deck without replacement. Find the probability of getting:
Find out the marginal probability density function for the provided value. Assume that two random variables, X and Y, have bivariate pdf given by:
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