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1. A geography teacher is interested in the link between mathematical ability and the ability to visualize three dimensional situations.He gives a group of 15 students a test and records each students score, m, on the mathematics questions and each students score, v, on the visio-spatial questions
He calculates the following summary statistics:
Smm = 3747.73, Svv = 2791.33, Smv = 2564.33
(a) Calculate the product moment correlation coefficient for these data
(b) Stating your hypotheses clearly and using a 5% level of significance test the theory that students who are good at mathematics tend to have better visio-spatial awareness.
History suggests that the average number of hurricanes formed during a year is 6.0 hurricanes. Find the probability of at most three hurricanes being formed during a randomly selected year.
For a random sample of 12 days at the Downtown location, the mean number sold was 78.80 and the standard deviation was 14.25. At the .05 significance level, is there a difference in the mean number of hamburgers sold at the two locations?
Infomercials often peddle products under the guise of "studies show," While some of the products are surprisingly good, many aren't.
The personnel director of Cander Machine Products is investigating perfectionism on the job. A test designed to measure perfectionism was administered to a random sample of 18 employees.
If the manufacturer's claim is true, what is the probability that the claim will be rejected?
A number of years ago, there was a popular television game show called Let's Make a Deal. The host Monty Hall, would randomly select contestants from the audience and, as the title suggests
A researcher hypothesized that the variation in the car rental rates (in US$/day) at a major city airport is less than in the car rental rates down town.
The thickness of metal plates made by a particular machine are normally distributed with mean of 4.3 mm and standard deviation of .0.12 mm. What is the value of c for which there is 80% probability that a metal plate has a thickness with in the in..
Suppose you are testing the differences in attitudes toward health care reform using Democrats, Republications, and Independents. What statistical test would you use?
If we assume all the possible random samples of 250 students at this university, 95 percent of the samples should have means among what two numbers.
Show that it satisfies the required condition for being a probability distribution.
Use Friedman test to find out whether there is evidence for significant difference between two population variance. Use .05 level of significance.
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