Exam in Statistics for Business, Exam 2
Course code: EST001
Course credits: 15 ECTS credits
Teacher: Johan Lindén
Date and time: 2008-10-21, 14.30-19.30
Aids: Any literature, any notes, calculator
Grades, minimum grade points required
A maximum of 30 grade point may be awarded for all exam questions together.
Swedish grades: Pass (G): 15p, Pass with Distinction (VG): 24p
ECTS grades: E: 15p, D: 18p, C: 21p, B: 24p, A: 28p
Time for grading
The results from the test are normally posted within 15 working days from the
date of the test.
Label all curves and axes in diagrams.
Explain all notation, especially if it isn’t standard notation used in the
Graphical and mathematical exposition must be accompanied by explana-
Start each question on a new sheet of paper. Number the sheets and sort
them into order (first question first).
Copy your final answers on the questions to the answer form found at the
end of the exam. Hand in the answer form along with the full solutions
to the problems. Both a correctly filled in answer form and complete,
motivated solutions are required for full marks.
Data variables can be measured at different levels of measurement. The text book
distinguishes between the folowing four levels of mearurement: nominal, ordinal,
interval, or ratio-level. Different statistical measures and tests requires that data
be measured at different levels of measurement to be applicable to the data.
At what level of measurement must data be measured for the following statistical
measures and tests to be meaningfully applied to the data?
(b) The coefficient of correlation
(c) Chi-squared contingency table analysis
(d) The sign test
(e) The Wilcoxon rank-sum test
The following data are measurements from three experimental treatments.
9 12 10
Treatment 2: 13 20 14 13
Treatment 3: 10
9 15 14 15
Assume data from each treatment are normally distributed. Use ANOVA to in-
vestigate if the measurement means diff