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Samples of the members of five different labor unions were asked whether they are for or against a certain piece of legislation:
Union 1 Union 2 Union 3 Union 4 Union 5 Total
For 74 81 69 75 91
Against 26 19 31 25 9
Use the 1% level of significance to test the null hypothesis that the corresponding true proportions are all equal
Find the matrix of expected values:
What test is appropriate for this problem?
State the null and alternate hypotheses
Find the test statistic
How many degrees of freedom will you use?
Find the critical value
Estimate the p-value
What is your conclusion?
The bus averaged 40 mph on the drive from Columbus to Athens but averaged 60 mph during the return trip. What was the average speed of the bus for the entire trip?
A random sample of 7 students selected from a large class revealed the following scores: midterm 70, 62, 57, 68, 89, 63, 82 and on the final 80, 79, 87, 88, 85, 79, 91. Is there evidence of an improvement on the final?
The mayor of a small town would like to know whether a local bond issue is likely to pass or not. He mails a survey to 500 randomly selected voters.
Were the chi-square and regression tests presented and used correctly? Could the authors' analysis be recreated?
Compute a 95% confidence interval for the population proportion of positive drug tests. Explain why is the normality assumption not a problem despite the very small value of p.
The mean change score for the sample studied is an increase of 5.2. What is considered a medium effect size for a t test for dependent means?
the mean incubation time for a type of fertilized egg kept at 100.3 f is 23 days. suppose that the incubation times are
a sample of 65 night-school students ages is obtained in order to estimate the mean age of night-school students. x
Assume this distribution follows a normal distribution. What is the probability that next week's show will: Have between 29 and 37 million viewers?
Record the type of research design used. True lab experiment, quasi-experiment, field experiment, or correlation design.
suppose diameters of trees in a particular forest are normally distributed with a mean of 18.4 inches and a standard
suppose that an ink cartridge is classified as being overfilled medium filled or underfilled with a probability of
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