Which of the following statements is not correct with regards to the Wilcoxon Signed-Rank Test?
a.If the underlying distribution is normal, it is often preferred to use the
t test because it will have more power associated.
b.In large-sample problems, the Wilcoxon test in usually not less efficient than the
t-test and may be more efficient if the underlying distribution is not approximately normal.
c.The Wilcoxon signed-rank test is designed for data that are basically symmetric but outlier-prone.
d.If the sample has an underlying distribution that is normal then either the signed-rank test or the
t-test could be used to test hypotheses about
.
Q. 2
Which of the following does the Wilcoxon Signed-Rank Test allow inferences to be made for?
a.the correlation
b.the interquartile range
c.the median
d.the variance
Q. 3
Which of the following is a possible test statistic for a Wilcoxon Signed-Rank Test?
a.
T =
T+
b.
T =
T-
c.All of these answers.
d.T = smaller of T-, T+
Q. 4
Suppose a study is conducted to determine customers' satisfaction with their shopping experience at Department Store A. The store believes that overall satisfaction levels are as follows: 1 unsatisfied, 40 satisfied and 59 extremely satisfied. If a random sample of 100 customers is surveyed and their satisfaction recorded, what would be the null and alternative hypotheses used to test the store's claim?
a.H
0:
versus H
a: at least one
is not true
b.H
0:
versus H
a:
c.H
0:
versus H
a:
d.H0: 
versus Ha: 
Q. 5 Suppose a random sample of undergraduate students was selected and asked if they were employed while attending school. Using the data given below, what is a 98 confidence interval for the difference in the proportion of males and females who were employed while attending school?
a.(-0.40, -0.12)
b.(-0.39, -0.14)
c.(-0.43, -0.09)
d.-3.61
Q. 6
Which of the following is not true with regards to an analysis of paired data?
a.The values of
and
are independent of one another with paired data.
b.
c.The paired difference is defined as
di =
Xi -
Yi.
d.If the paired observations are randomly selected from normal populations, then the paired difference will be approximately normally distributed.
Q. 7 Given the following summary statistics for the mean calcium uptake for two methods, what would be the degrees of freedom for a two-sample
t test of
if
?
a.
df = 8
b.
df = 7
c.
df = 5
d.
df = 9
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