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What are the requirements for applying the hypothesis test for the difference in two population proportions? What are the calculations (computations)?
Suggest one psychological research question that could be answered by each of the following types of statistical tests:
Construct a 90% confidence interval for the standard deviation of the number of hours this firm's employees spend on work-related activities in a typical week.
Using a significance level of 0.05, can we conclude from this information that the course is successful in improving individuals' knowledge of Web page design?
What is the 99% confidence interval?
A survey of 85 families showed that 36 owned at least one DVD player. Find the 99% confidence interval estimate of the true proportion of families who own at least on DVD player.
For the population with standard deviation of σ =10 a score of x=44 corresponds to z= -0.50. Determine the population mean?
A medical researcher estimates that no more than 55% of U.S. adults eat breakfast every day. In a random sample of 250 U.S. adults, 56.4% say they eat breakfast every day.
FedEx and United Parcel Service (UPS) are the world's leading cargo carriers by volume and revenue (The Wall Street Journal, January 27, 2004).
A study of 20 worldwide financial institutions showed the correlation between their assets and pretax profit to be .86. At the .05 significance level
Collapse the response categories in the following tables so that it meets the assumptions of the chi-square test; than perform the test.
A study showed that 60% of The Wall Street Journal subcribers watch CNBC every day. Of these, 70% watch it outside the home. Only 20% of those who don't watch CNBC every day watch it outside the home.
What is a p-value in testing hypothesis? How does this p-value help us to decide to/not to reject a Null hypothesis? What might happen if we do not use this p-value in particular, when we are rejecting a Null hypothesis?
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