The manufacturer of the Ososki motorcycle advertises that the cycle will average 87 miles per gallon of gasoline. A sample of eight bikes revealed the following mileage:
88, 82, 81, 87, 80, 78, 79, 89
At the .05 level, is the mean mileage less than the advertised 87 miles per gallon?
Solution Preview
The manufacturer of the Ososki motorcycle advertises that the cycle will average 87 miles per gallon of gasoline. A sample of eight bikes revealed the following mileage:
88, 82, 81, 87, 80, 78, 79, ...
Solution Summary
To test if the mean mileage less than the advertised 87 miles per gallon.
Suggest one psychological research question that could be answered by each of the following types of statistical test:
* z test
* t test for independent samples, and t test for dependent samples
Is there an alternative test to the chi squared test? What if my results give an expected frequency below 5, which stats book states that these should be treated with caution? Is there a more appropriate stat test which would be more accurate in working out the significance of the results?
A research organization has collected the following data on household size and telephone ownership for 200 U.S. households at the 0.05 level, are the two variables independent? Based on the chi-square table, what is the most accurate statement that can be made about the p-value for the test?
A medical test for malaria is subject to some error. Given a person who has malaria, the
probability that the test will fail to reveal the malaria is 0.06. Given a person who does not
have malaria, the test will correctly identify that the person does not have malaria with
probability 0.91. In a particular area, 20% of the
Consider the following hypothesis test: H0: mean greater than or equal to 5 vs. H1: mean < 5. Suppose that you take a sample and conduct the test. You conclude that you can reject the null hypothesis.
What can you say about the results of the hypothesis test: H0: mean = 5 vs. H1: mean not equal to 5 tested using the same
Collapse the response categories in the following table so that it meets the assumption of the chi-square test; then perform the test.
OWNERSHIP
Education Owners Non-owners
Less than grade 8
Perform a chi-square test on the following data:
(a) Regulation is the best way to ensure a safe workplace.
Managers Blue-Collar Workers
Agree 58 66
Disagree
