Correct answers
to exercises in the course syllabus


Week
Exercise
Correct Answer
2 - Data Presentation"Company vehicles"
Weekly distance (x)f
110 and under 1201
120 and under 1303
130 and under 1407
140 and under 15014
150 and under 1608
160 and under 1705
170 and under 1802

n = 40
3 - Central Tendency"Company vehicles"Raw Data:
mean = 146.8
median = 146
mode = 135
variance = 166.06
S = 12.9
slight positive skewness
Frequency Distribution:
mean = 147.0;
median = 146.8 (based on the ogive),
mode = 145 (mid-point of modal class)
variance = 181
S = 13.5
5 - Index NumbersIndices for 1996
ProductSimple price index:Simple quantity index:
Thingums108101.4
Buckles112.590.7
Sew-ons112.5 110
Aggregate PriceLaspeyrePaasche
111.1110.7110.6
Indices for 1997
ProductSimple price index:Simple quantity index:
Thingums120104.3
Buckles12576.7
Sew-ons125112
Aggregate PriceLaspeyrePaasche
123.5123.0122.8
2.Rise between 1995 and 1996 = 10.7%
Rise between 1995 and 1997 = 23%
Rise between 1996 and 1997 = 11.1%
3.
(adjustment of wage index)
I1996 = 107.56
I1997 = 115.97
The wage rises were not the main factor.
6 - Correlation1 - 5
Minitest 1
Answers will be made available
in the due course of time
7 - Chi-Squared Test1 - 5Answers will be made available
in the due course of time
8 - Probability1 - 5Answers will be made available
in the due course of time
9 - Binomial Distribution1 - 5
Minitest 2
Answers will be made available
in the due course of time
10 - Normal Distribution1 - 5Answers will be made available
in the due course of time
11 - Statistical Inference1 - 5Answers will be made available
in the due course of time