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1) A researcher is comparing 4 groups to test if they have the same means. There are 72 data values altogether. The degrees of freedom for the Between(dfB) and the degrees of freedom for the With-in (dfW) are?2) If there are 3 means to be compared, then how many possible different comparisons are there altogether?
They select a random sample of 525 employment records, and find that 229 of the people are females. State the conditions needed to build a confidence interval.
Can the formal hypothesis testing approach be used for non parametric tests? How are parametric and nonparametric statistics different?
The number of mathematics texts actually chosen, construct a table showing the values of the joint probability distribution of x and y.
Please show all steps to simplifying the rational expression.
What are three lessons you learned relative to ANOVA and nonparametric tests? As a result of using this simulation, what concepts and analytic tools will you be able to use in your workplace (i.e., how do you expect to apply what you learned)?
Test for single Proportion - Are the data consistent with the model? Answer yes or no, and explain briefly.
The following table shows the hardness (in Brinell hardness numbers) and the tensile strength (in thousands of pounds per square inch) of ten specimens of a certain alloy.
If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours?
A certain airplane has two independent alternators to provide electrical power.
The Starbucks in the Bauer College of Business found that 24% of customers purchase more than one cup of coffee per day from their shop. If 180 customers are randomly selected one day, what is the probability that no less than 25% of them purchase..
Suppose we want to conduct a poll to estimate the proportion of voters who approve of the current mayor, and we plan to use a 95% confidence interval for our estimate.
By contrast, the large retail grocery chains (Kroger, Safeway, etc.) that sell cereal make much smaller margins. What would explain this divergence in margins?
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