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Do students at various colleges differ in now sociable they are? Twenty-five students were randomly selected from each of three colleges in a particular region and were asked to report on the amount of time they spent socializing each day with other students. The results for college x was a mean of 5 hours and an estimated population variance of 2 hours: for college y, m= 4, s2=1.5; and for college Z, M= 6, s2 =2.5 what should you conclude? Use the .5 level.
(a) Use the steps of hypothesis testing,
(b) Figure the effects size for the study; and
(c) Explain your answer to (a) and (b) to someone who has never had a course in statistics.
What does r 2 of .73 tell us? Is this a strong or weak correlation? How can you tell?
What is the probability that a roulette ball will come to rest on an even number other than 0 and 00?
How many commercials' worth of data do I need to have a margin of error no more than 3, the correct set of hypotheses
Extra college-level training, and rest of the sailors arn't accounted for. How does your sample compare to what you expected to determine? Define null hypothesis.
Show the graph of the probability density function for flight time.
Compute the proper measure of association of smoking and lung cancer.
Find out the probability that at least one of the CD's is defective?
What can one conclude about the librarian's hypothesis at a level of significance of .05?
At 5% level of significance, does this sample prove violation of guideline that average patient must pay no more than $250 out of pocket?
Create a 90% confidence interval for mean score on this placement exam for all students.
Calculate chi-square for the cross-tab. Show your work. Is there a statistically significant relationship between these variables?
Using a separate 2 by 2 table, compute predictive value positive and predictive value negative for population of 1,000 drug users.
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