17 APRIL 2015
STA2020F TUT 8
TIME SERIES
QUESTION 1
Chad is an aspiring coffee roaster and is seriously considering starting his own business. A
crucial variable of interest is the price per kg of ra
17 APRIL 2015
STA2020F TUT 8 MEMO
TIME SERIES
QUESTION 1
a) There are four basic steps to performing a time series analysis:
i.
ii.
iii.
iv.
Plot the time series
Identify the components of the series
Build
STA2020F TUTORIAL 11: NON-PARAMETRIC STATISTICS
10 MAY 2013
MEMO
QUESTION 1
Wilcoxons Rank Sum Test would be appropriate for this problem as:
We are comparing two independent samples of quantitative data and trying
to determine if they come from the same
STA2020F TUTORIAL 10: NON-PARAMETRIC STATISTICS
3 MAY 2013
MEMO
QUESTION 1
a) The Binomial test would be appropriate for this problem as:
We are dealing with a single sample of nominal data with two mutually
exclusive and exhaustive outcomes
We are tryi
STA2020F TUTORIAL 11: NON-PARAMETRIC STATISTICS
10 MAY 2013
1. (Question 1 in Additional Exercises)
The human resource manager of a large company wanted to compare how long business
and non-business graduates worked for the company before quitting. Two sa
STA2020F 2015
Tutorial Test 2 a
Question 1
Fifty children at a local school were subjected to a medical exam in order to determine which
factors are relevant in predicting a scaled cholesterol measurement () in children. The
variables measured were the le
STA2020F 2015
Tutorial Test 2 b
Question 1
Fifty children at a local school were subjected to a medical exam in order to determine which
factors are relevant in predicting a scaled cholesterol measurement () in children. The
variables measured were the le
24 APRIL 2015
STA2020F TUT 9
TIME SERIES
QUESTION 1
The quarterly earnings (in millions of Rands) of a cold drink manufacturer in SA are found in
the table below.
Year
Quarter
2007
200
STA2020F 2015
Tutorial Test 2 a MEMO
Question 1
Fifty children at a local school were subjected to a medical exam in order to determine which
factors are relevant in predicting a scaled cholesterol measurement ( ) in children. The
variables measured were
STA2020F 2015
Tutorial Test 2 b MEMO
Question 1
Fifty children at a local school were subjected to a medical exam in order to determine which
factors are relevant in predicting a scaled cholesterol measurement ( ) in children. The
variables measured were
STA2020F Tutorial 5 20 March 2015
Multiple Regression
1. Box and Youle (1955) performed a series of 19 experiments to investigate a chemical
reaction. The aim was to establish if a relationship exists between the percentage of
material converted to the de
STA2020F Tutorial 5 20 March 2015 - Solutions
Multiple Regression
1. Box and Youle (1955) performed a series of 19 experiments to investigate a chemical
reaction. The aim was to establish if a relationship exists between the percentage of
material convert
STA2020F Tutorial 7 10 April 2015
Multiple Regression/Model Building
Question 1
To determine if the type of adverting is related to the number of customers coming to a shop,
a manager advertised multiple times each week (1 denoting the number of advertise
STA2020F Tutorial 6 27 March 2015 Solutions
Multiple Regression
1. Due to the economic crisis in the world, an investment company had to reduce their
staff complement. This resulted in the remaining employees having a heavier
workload. The manager, being
STA2020F Tutorial 6 27 March 2015
Multiple Regression
1. Due to the economic crisis in the world, an investment company had to reduce their
staff complement. This resulted in the remaining employees having a heavier
workload. The manager, being concerned
STA2020F Tutorial 7 10 April 2015 Solutions
Multiple Regression/Model Building
Question 1
a) In the stepwise regression procedures, we have and values:
i) What relationship has to be in place between these values? Why is this
relationship necessary?
< ,
STA2020F - SIMPLE REGRESSION
TUTORIAL 5
1.
a.
Scatter plot of actual vs. virtual inventory
Actual inventory level
(thousands of Rands)
3500
3000
2500
2000
1500
1000
500
0
0
500
1000
1500
2000
2500
3000
3500
4000
Computer inventory record
(thousands of Ran
STA2020F - SIMPLE REGRESSION
TUTORIAL 6
1.
a) = 44.18 + 2.941 + 0.093
b) The model is valid: testing the hypothesis 0 : 1 = 2 = 0 against 1 : that at
least one regression coefficient is not 0
Since the -statistic = 46.65 and we have a corresponding -value
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STA2020F
Class Test 2
Date: 16 April 2008
Time: 1 hour
SECTION A (20)
Question 1.
In multiple regression, why is it necessary to test the hypothesis that at least one of the
s differs from 0 before testing each individual for difference from 0?
[2]
Quest
STA2020F MCQ TEST OF 24 MAY 2007
1) e
2) a
3) d
4) a
5) c
6) b
7) d
8) a
9) e
10) e
11) b
12) d
13) a
14) d
15) d
16) c
17) c
18) a
19) d
20) a
21) d (no answer bonus mark given)
22) e
23) c
24) a
25) d
STA2020F 2007
CLASS TEST 1 SOLUTIONS
SECTION A:
1.
2.
3.
4.
5.
6.
7.
8.
T
F
T
T
T
T
T
F
[1 x 8 = 8]
SECTION B:
Question 1:
a.
b.
c.
[13]
Two factor anova with interaction or two factor factorial experiment
[1]
Variation due to differences in room sizes (d