a)
Ho : there is no difference in salaries earned
Ha: there is difference in salaries
b)
we use Wilcoxon rank-sum test
Wilcoxon rank-sum test is a nonparametric test
of the null hypothesis that it is equally likely that a randomly
selected value from one sample will be less than or greater than a
randomly selected value from a second sample.
Wicoxon signed rak test is like paired t-test which is not true here
c)
A <- c(70, 66, 65, 80, 62, 69, 73, 77, 74, 72)
B <- c(71, 67, 56, 74, 54, 65, 76, 58, 64, 52)
wilcox.test(A, B, paired = FALSE, alternative = "two.sided", mu = 0.0, exact = TRUE, correct = TRUE, conf.int = TRUE, conf.level = 0.90)
d)
Test statistic W : 74
p-value : 0.075442
e)
we reject the null hypothesis
as p-value < alpha
f)
we conclude that there is evidence of difference in salaries
4. A private industry analyst claims that there is no difference in the salaries earned by...
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