Critical Value Method
In a nutshell: Only significant difference with the p-value method
is the decision rule:
Compare
p-value method:
p-value to
CV method:
TS to CV
Because of this difference the decision rule changes.
Left-Tail
Two-Tail
Right-Tail
Reje
BUAD 2070
Chapter 10 Worksheet 1
Page 1 of 1
Key
Name _
In a completely randomized experimental design, 11 experimental units were used for each of the 3 treatments.
k=3
Source of
Sum
Degrees
Mean
nT = 11 + 11 + 11 = 33
Variation
of Squares
of Freedom
Squ
BUAD 2070 Chapter 7(2) Worksheet 1 Page 1 (if 1
Name K (15
A student used multigle regression analysis to study how family spending (y) is influenced by income
(X1), family size (X2), and additions to saving@ The variables y. X1. and X3 are measured in l
Salary information regarding male and female employees of a large company is shown below:
a l 2
Male Female
Sample Size 64 36
Sample Mean Salary (in $1000) 44 41
Population Variance 128 72
At a 5% significance level, test whether or not the average salary
Salary information regarding male and female employees of a large company is shown below.
Sample Size
Sample Mean Salary (in $1,000)
Population Variance (2)
Male (Pop. 1)
64
44
128
Female (Pop. 2)
36
41
72
The point estimate of the difference, 1 2 , betwe
A movie-rating television show has two hosts that often create the impression that they
strongly disagree about which movies are best - in spite of each other. Each movie is
categorized as thumbs up, mixed or thumbs down. A sample of 160 movie reviews
wer
keAubeia-g gang vat; mg;
_A#H_w Fj'V'QI-le Mc'l'g-OA
- CI 4- HT _.;Jg:a=., 99. cm
_ . I+rPr4'1n5_'l-L<P;v_lu_c_:_ma.a3 was; (+4.45 PHMQU')
slcmsm " _ v P P pfibpcarl'icn~ a-p worms.
Claim: More women watch football than men."
a) State the null and a
The past demand data shown below can be regarded as having a horizontal pattern. What are the
forecasts for February May using the naive method? What are the measures of forecast accuracy
computed for February, March and April?
Month
January
February
Marc
Exhibit 10-7. To compare mean monthly sales (per salesperson) in three territories (A, B, and C), 10 salespersons were
randomly and independently selected from each of the three territories. After recording the monthly sales of the 30
salespersons, ANOVA
Calculate the three-month weighted moving average forecasts for April through July using the
weights: 0.5, 0.3, and 0.2 (largest weight is for most recent data). Compute the MAE, MSE and
MAPE estimates.
Month
Deman
d
January
40
February
45
March
57
April
Salary information regarding male and female employees of a large company is shown below:
Sample Size
Sample Mean Salary (in $1000)
Population Variance
Male
64
44
128
Female
36
41
72
At a 5% significance level, test whether or not the average salary of ma
Contingency Tables in Excel
I've just used a 3 x 2 contingency table here, but it can be expanded. Just make sure that the row and column totals are correct. Also,
if you expand the contingency table, the list of calculations in the table on the right wil
The past demand data shown below can be regarded as having a horizontal pattern. What are the
forecasts for February May using the naive method? What are the measures of forecast accuracy
computed for February, March and April?
Month
January
February
Marc
Below you are given a partial statistical software output based on a sample of 25 observations.
Constant
x1
x2
x3
Coefficient
145.321
25.625
-5.720
0.823
Standard Error
48.682
9.150
3.575
0.183
The estimated regression equation is
a. y 0 1 x1 2 x 2 3 x 3
30 individuals were randomly selected to develop a linear regression equation relating their yearly
income (in $1,000s) with their age and their gender (1 if male and 0 if female). This led to the
following information:
ANOVA
df
SS
MS
F
Regression
Error
3
Key
Name _
/ _
Hypothesis Testing In-Class Project
Suppose that a manufacturer has received a shipment of widgets from a supplier, and
that the shipment is subject to inspection prior to acceptance. Because inspection is
expensive and time-consuming, the
Claim: More women watch football than men.
a) State the null and alternative hypothesis:
b) If = 0.05, what is the Decision Rule for this test?
c) Suppose that 330 out of 650 randomly selected viewers were female. Calculate
the p-value. Show your work.
d)
Key
Name _
Hypothesis Testing Worksheet3
1) The label on a bottle of fruit juice claims that the average amount of juice is 16 ounces.
A consumer advocacy group wants to perform a test to determine if the average is actually
less than this.
a) What would
Key
Name _
Hypothesis Testing Worksheet 4
1) An insurance company is reviewing its current policy rates. When originally setting the
rates they believed that the average claim amount was $1,800. They are concerned that the
true mean is actually higher tha
Linear regression analysis was applied between sales data (y in $1,000s) and advertising expenditures
(x in $100s). A random sample of 17 observations led to the following information:
ANOVA
SS
Regression
df
MS
F
225
Error
Total
Intercept
Expenditure
300
Name _ , _
BUAD 2070 - Hypothesis Testing Worksheet 5
You are given the following information obtained from a random sample of 4 observations.
25
47
32
56
Using the critical value method, test whether or not the mean of the population from which
this samp
Hypothesis Testing Worksheet #1
Determine the null and alternative hypotheses for the following situations:
1) According to the U.S. Census Bureau, 11.8% of registered births in the country in
2000 were to teenage mothers. A sociologist wants to see if th
Hypothesis Testing Worksheet #1 - Solutions
Determine the null and alternative hypotheses for the following situations:
1) According to the U.S. Census Bureau, 11.8% of registered births in the country in
2000 were to teenage mothers. A sociologist wants
A movie-rating television show has two hosts that often create the impression that they
strongly disagree about which movies are best - in spite of each other. Each movie is
categorized as thumbs up, mixed or thumbs down. A sample of 160 movie reviews
wer
The past demand data shown below can be regarded as having a horizontal pattern. What are the
. forecasts for February ~ May using the naive method? What are the measures of forecast accuracy
computed for February, March and April?
in Ftl
Month Demand For
A large data set on Toledo workers was collected and the first three workers are characterized by:
Worker
1
2
3
1 if female
Female = cfw_
0 otherwise
Age
33
30
36
Hourly Wage
$20
$24
$16
1 if union
Union = cfw_
0 otherwise
Female
0
0
1
Union
0
1
0
High Sc
X2
4.5
4
2
The scatter chart to the left
displays 6 observations of a
training set plotted according to
the values of 2 quantitative
variables (x1 and x2 expressed in
the same units) that characterize
the 6 observations. (The
normalization of these values
The dendrogram below was produced by XLMiner for a hierarchical clustering method refers to a data set with
13 observations. (Two black lines were added to visualize a reduction in the number of clusters.)
F
C
J
H
D
A
M
B
G
I
The two added dashed lines sh
The confusion matrix for a classification method with Class 1 and Class 0 is given below.
Confusion Matrix
Actual Class
1
0
What is the percent overall error rate?
a. 36.67%
b. 7.69%
c. 58.82%
d. 43.25%
What are the percent error rates for Class 1 and Cla