Soft Copy: Yes
Q. Explain the Gauss – Jordan Method for solving a system of linear simultaneous equation
with the help of an example.
Q. Coefficients of variation of two series are 75 percent and 90 percent, with standard
deviations 15 and 18, respectively. a) Obtain the mean of the two series, b) Also
comment which of the two is better represented by
Q. Bottled sweet milk stored in a godown is reported to have gone sour. A test check
revealed that milk in 25 percent of the bottles is unfit for consumption. The salesman at a
retail outlet offers 5 bottles for sale on demand, find the probability that milk will be unfit
for consumption a) exactly in 2 bottles, b) at least in 2 bottles, and c) at the most in 2
Q. A sample survey of tax-payers belonging to business class and professional class yielded
the following results:
Business class Professional class
Sample size n1 = 400 n2 = 420
Defaulters in tax payment x1 = 80 x2 = 65
Test the hypothesis at α = 0.01 level of significance that defaulter rate is the same for the two classes of tax-payers.
Q. Write short notes on:
i) Mixed Auto-regressive moving average models
ii) Least Squares Criterion
iii) Rank Correlation.
MS-08 Solved Assignment IGNOU MBA
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Old Sample Answer
Q. Write a note on measures of central tendency.
Answer. Measures of central tendency are descriptive statistics that summarize the data with a single number that represents the most typical score within a set of data. We use measures of central tendency because we typically believe that most scores on a scale or responses to an item cluster around the typical or most common score or response in the data set. Consequently, a measure of central tendency is a convenient statistical tool for indicating the most typical score in a set of data. Selecting an appropriate measure of central tendency depends on the measurement scale used to represent a particular variable........... Measures of central tendency identify the middle or centre of a set of data. There are three types: Arithmetic average or mean – the total of items or scores in a set divided by the number of individual items in the set. It may give a distorted picture because of large items at either end of the scale. Median – the middle item in a range of items (often used in pay surveys when the arithmetic mean is likely to be distorted). Mode – the most commonly occurring item in a set of data......... The following are the few requirements to be satisfied by an average or a measure of central tendency: It should be rigidly defined The definition of an average should be clear and rigid so that there must be uniformity in its interpretation by different decision-makers or investigators. There should not be any chance for applying discretion; rather it should be defined by an algebraic formula.........