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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?
A sample of n= 16 scores has a mean of M = 45 and SS = 960. Calculate the sample standard deviation (s) and the estimated standard error for the sample means (SM).
Given that Vacationer will travel less than 500 miles, Find out the probability that he/she will drive or take the Bus/Train?
What is the probability that the number of granite selected for analysis is within 1 standard deviation of it means value.
Conduct a statistical test to determine if the sample is representative of the population.
Discuss how the null and alternative hypothesis for one-sample testing differs from two-sample testing; and explain how these two hypothesis' are the same, and provide a numerical example?
Find the z-score for each score in the population. Transfer the original population into a new population of N=5 scores with a mean of μ=60 and a standard deviation of σ=8
Suppose that X1,..,Xn form a random sample from the normal distribution with unknown mean M and unknown standard deviation S, and let m and s denote the MLEs of M and S. for the sample size n=17, find a value of k such that P(m > M +ks) = 0.95
Suppose that the number of calories in McDonald's Egg McMuffin is normally distributed random variable with mean of 290 calories and standard deviation of 14 calories.
Does this sample provide enough evidence to conclude that self-esteem scores for group-participation adolescents are significantly different from those of the general population? Use a two-tailed test with α = .01.
Discuss whether this variable should be placed in the model as an ordinary quantitative variable or by means of four 0, 1 indicator variables.
Calculate the Coefficient of Skewness and the Coefficient of Variation for time spent working on QM.
Is there evidence to suggest a difference in the mean waiting times at the four body shops?
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