In portfolio analysis, the ________ is the reciprocal of the return to risk ratio.
The _______ (larger/smaller) the value of the Variance Inflationary Factor, the higher is
the collinearity of the X variables.
TABLE 11-11
A student team in a business statistics course designed an experiment to investigate
whether the brand of bubblegum used affected the size of bubbles they could blow. To
reduce the person-to-person variability, the students decided to use a randomized block
design using themselves as blocks.
Four brands of bubblegum were tested. A student chewed two pieces of a brand of gum
and then blew a bubble, attempting to make it as big as possible. Another student
measured the diameter of the bubble at its biggest point. The following table gives the
diameters of the bubbles (in inches) for the 16 observations.
Referring to Table 11-11, what are the degrees of freedom of the randomized block F
test for the difference in the means at a level of significance of 0.01?
Referring to Table 14-8, the value of the partial F test statistic is
________ for
H0 : Variable X2 does not signi cantly improve the model after
variable X1 has been included
H1 : Variable X2 signi cantly improves the model after variable X1 has
been includedTABLE 14-8
A nancial analyst wanted to examine the relationship between salary
(in $1,000) and 2 variables: age
(X1 = Age) and experience in the eld (X2 = Exper). He took a sample
of 20 employees and obtained the following Microsoft Excel output:
Also, the sum of squares due to the regression for the model that
includes only Age is 5022.0654 while the sum of squares due to the
regression for the model that includes only Exper is 125.9848.
Twelve students in a Business Statistics class are to be formed into three teams of four.
How many different ways can this be done?
TABLE 11-10
An agronomist wants to compare the crop yield of 3 varieties of chickpea seeds. She
plants all 3 varieties of the seeds on each of 5 different patches of fields. She then
measures the crop yield in bushels per acre. Treating this as a randomized block design,
the results are presented in the table that follows.
Referring to Table 11-10, what are the degrees of freedom of the F test statistic for
testing the block effects?