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What are the critical values for z on a one-tailed test if alpha = .01? .001? What would the critical values be at both levels of significance if it was a two-tailed test?
A local bank reports that 80 percent of its customers maintain a checking account, 60 percent have a savings account, and 50 percent have both.
A manager at a local manufacturing company has been monitoring the output of one of the machines used to manufacture small aluminum plates.
The probabilities of low, medium and high compliance are 0.3, 0.4, and 0.3, respectively
Test whether there is significant difference in the test anxiety level of the three groups using nonparametric test.
The conservative degrees of freedom for the t distribution are and The standard error, conservative degrees of freedom
The 'interaction effect' was also important. By using the means in the table above write a statement explaining how the anti-anxiety drug appears to affect anxiety. Are the outcomes consistent with the hypothesis proposed by the researchers?
Do the thinner cans appear to be strong enough so that they are not crushed when the top lids are pressed onto the sides?
The average weight of 40 randomly selected minivans was 4150 pounds. The standard deviation was 480 pounds. Find the 99% confidence interval of the true weight of the minivans.
For a regional survey of suburban households to obtain data on television viewing habits, a statistical sample of suburban areas is first selected. Within the chosen areas, statistical samples of whole blocks are selected; and within the selected..
Chi square compares actual data with expected data. What would the expected data be? For example, if I know the percentage of brown M&Ms in a bag is 40% set by the company
For sample of size 100, what is the mean and standard deviation of the sample mean.
In this continuous production process, the amount of toothpaste put in a tube is normally distributed with a mean of 8.17 ounces and a standard deviation of 0.12 ounces. If the actual capacity of the tubes used is 8.49 ounces, what proportion of t..
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