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
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
An Example
Why do mammals sleep?
Multiple Regression Output
SUMMARY OUTPUT
Regression Statistics
Multiple R
0.546673
R Square
0.298852
Adjusted R Square
0.271356
Standard Error
4.015395
Observations
54
ANOVA
Regression
df
SS
MS
2
350.487782
175.2439
Resid
Why do giraffes have such long necks?
Hypothesis 1: reach leaves high up in trees.
Hypothesis 2: males with longer and heavier
necks are better at fighting.
Predictions
Allometry (scaling relationships between body parts)
Prediction under H1: necks should
UNIVERISTY OF CAPE TOWN
DEPARTMENT OF STATISTICAL SCIENCES
STA2020F COURSE INFO SUMMARY SHEET 2017
This document is a summary and has to be read in conjunction with the complete course outline!
GENERAL
Lecture notes:
A course pack can be collected from th
STA2020F: Applied
Statistics
Simple Linear Regression
Chapter 14 in Statistics for Business and Economics
(3rd Edition)
Res Altwegg
Associate Professor at Dep of Stat Sci
Heading up the centre for Statistics in Ecology,
Environment and Conservation (SEE
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
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
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?
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STA2020F 2006
Class Test 1
Date: 30th March 2006
Total marks: 60
Time: 1 hour 30 minutes
Instructions: Answer all the questions in your blue answer book. Your answer
should be T or F for each question in section A and a written answer for section B.
There
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