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Do students at various universities differ in how sociable they are? Twenty-five students were randomly selected from each of three universities in a region and were asked to report on the amount of time they spent socializing each day with other students. The result for University X was a mean of 5 hours and an estimated population variance of 2 hours; for University Y, M = 4, S² =1.5 ; and for University Z, M=6, S² = 2.5. What should you conclude? Use the .05 level.
(a) Use the steps of hypothesis testing(b) figure the effect size for the study(c) explain your answers to parts (a) and (b) to someone who has never had a course in statistics.
Describe to a person who has never taken a course in statistics the meaning of a grouped frequency table.
The lives of many people are affected by a fear that prevents them from flying. An institute for public opinion conducted a poll of 1014 adults, 48%of whom were men.
Find out the p-value associated with test of hypothesis you conducted?
To conclude the effect of a new fertilizer on productivity of tomato plants one group of plants is treated with the new fertilizer as a second group is grown without such treatment. The number of ripe tomatoes produced by each group is counted.
A recent study of breast cancer revealed that 13% of the women in the sample used antibiotics more than 500 days in their lifetime.
The Republican party is interested in studying the number of Republicans that might vote in a particular Congressional district. Assume that the number of voters is binomially distributed by party affiliation (either Republican or not Republican).
What is the probability that the contaminated can is selected for testing?
Test whether there is difference in the proportion of viewers using Chi square test.
One of the children, though, fails to solve the problem so the researcher has an undetermined score. What is the best measure of central tendency for these data?
Total square footage (X4) (columns in the data file are in that order). (a) Obtain the scatter plot matrix and the correlation matrix. Interpret these and state your principal findings.
Super Markets, Inc. is considering expanding into the Scottsdale, Arizona, area. Ms. Luann Miller, Director of Planning, must present an analysis of the proposed expansion to the operating committee of the board of directors
For this purpose, a random sample of 55 plots, each of size 100 square meters, is used. The number of ferromagnetic artifacts for each plot is determined.
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