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For each of the following statistical tests, state the null hypothesis and the two sided alternative hypothesis.
a. A one sample t-test
b. A paired-samples t-test
c. An independent-samples t-test
Find a 95% confidence interval for the proportion p of the inner-city, working-class group who eventually became alcoholics.
The following estimated regression model was developed relating yearly income (Y in $1,000s) of 30 individuals with their age (X 1 ) and their gender (X 2 ) (0 if male and 1 if female).
Would the method described above be a good way to determine which team was taller (explain why or why not)?
Jim and Mike go to a coffee shop during their lunch break and toss a coin to see who will pay. The probability that Mike will pay three days in a row is 0.125.
For a standard normal distribution, findout the percentage of data that are among 3 standard deviation below the mean also1 standard deviation above the mean.
How does a researcher determine the meaning of a score on a norm-referenced test such as an IQ test? Why are raw scores transformed to standardized scores, such as z-scores, in order to interpret those raw scores?
If 200 passengers take this flight, find the binomial and Poisson probability of no platinum flyers (round your answer to 4 decimal places).
Based on the custom "rule-of-thumb" for estimating the standard deviation, if the range of prices for a product sold in Kansas City is between $99 and $349, an estimate of the standard deviation of the prices would be about:
Explain the distribution of mean of samples of size 15.
How to do multiple regression using Excel and the Megastat plugin. Students are given step-by-step instructions on how to use the MegaStat plugin for Excel and told why Excel's Data Analysis Toolpak isn't reliable for rigorous statistical analysis..
Part 1: Define and explain historical research. Explain a situation in which historical research would be appropriate. Part 2: Explain the difference between external and internal evidence and give examples of each.
What are the 2 ways in which researchers assess the reliability of their measures? Be sure you understand the difference among these 2 approaches to reliability.
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