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We wish to determine whether the homicide rate is different in different parts of the country and, if it is different, what is the pattern. We have data on 36 states - 9 each in the four regions Northeast, Midwest, South and West.
Region Homicide rate
Northeast 3.23
Midwest 5.01
South 7.23
West 5.03
An analysis of variance produced the following partial ANOVA table:
Source SS
Between groups 72.40
Within groups 152.11
TOTAL 224.51
Complete the ANOVA table. Show that at 5% we reject the null. Use the Tukey HSD procedure [at 5% level] to determine which means are statistically different from which other of the means. What are your final conclusions?
Given the following ordered data pairs (x, y), compute the value of the linear correlation coefficient r: (2,6) (3,0) (5,15) (5,5) (10,2).
Find the test statistic . Find the standardize test statistic. decide whether the standardize test statist is in the rejection region and decide whether you should reject or fail to reject the null. Sample are random and independent. Claim u1 =u2,..
Select an activity you do on a regular basis (e.g., cooking a meal, cleaning the house, doing homework, etc.) and discuss how you could apply statistical quality control to improve the quality of the output of the activity you choose.
Determine r.m.s. error for regression prediction of height at 18 from height at 6.
Determine the event that the sum of the numbers falling uppermost is less than or equal to 7
A survey of 600 non-fatal accidents showed that 111 involved the use of a cell phone. Find a point estimate for p, the population proportion of accidents that involved the use of a cell phone.
The Kirschner Company has a contract to produce garden hoses for a customer. Kirschner has 5 different machines that can produce this kind of hose. Write the constraint that indicates they have to use at least three of the five machines in their p..
Data collected by a child development scientist produced a 95% confidence interval for the mean age, μ (in weeks) at which babies began to craw as [21.4, 31.6]
Are the events "Republican" and "30-44" independent? Justify your answer. Are the events "Democrat" and "65+" independent? Justify your answer.
You want to determine whether or not an observational coding system you've created for ADHD is better as a system with 5 behavioral scales or 3 behavioral scales. What test should be run?
An experiment consists of flipping the fair coin three times and noting the number of heads and tails. A random variable x is defined to be two times the number of heads plus the number of tails.
The width of a confidence interval will be:
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