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MS-08
Q. What are quartiles, deciles, and percentiles? State the general equation of computing the ith
quartile, jth decile, and kth percentile.
Answer. Quartiles are measures like the median. Median divides the series into two equal parts.
Extendingthisconceptof median,we have quartiles. Quartiles can be classified into Q1, Q2 and Q3
Thisdividedthe series into four equal parts....... Deciles: The values which divides an ordered data
setinto10 equal parts.The 5th decile is the median. The values of observations in a data set when
arranged in an ordered sequence can be divided into ten equal parts, using nine deciles......
Percentiles The values of observations in a data when arranged in an ordered sequence can be
dividedintohundredequal partsusing ninety nine percentiles, Pi (i = 1, 2,…, 99). In general, the ith
percentile is a number that has i% of the data values at or below it and...........
Q. In a railway reservation office, two clerks are engaged in checking reservation forms. On an
average, the first clerk (A1) checks 55 per cent of the forms, while the second (A2) checks the
remaining. While A1 has an error rate of 0.03 that of A2 is 0.02. A reservation form is selected at
random from the total number of forms checked during a day and is discovered to have an error.
Find the probabilities that it was checked by A1, and A2, respectively.
Answer.....
Q.The weeklywagesof 2000 workmenare normally distributed with mean wage of Rs 70 and wage
standard deviation of Rs 5. Estimate the number of workers whose weekly wage are
a. between Rs 70 and Rs 71?
b. between Rs 69 and Rs 73
c. more than Rs 72, and
d. less than Rs 65
Answer.....
Q. A research organization claims that the monthly wages of industrial workers in district X
exceeds that of those in district Y by more than Rs 150. Two different samples drawn
independently from the two district yielded the following results:
District X: x1 = 648, s12 = 120, and n1 = 100
District Y: x2 = 495, s22 = 140, and n2 = 90
Verify at 0.05 level of significance whether the sample results support the claim of the
organization.
Answer. ........
Q. What do you mean by decomposition of a time series? State the essential characteristics of the
additive and multiplicative models of time series analysis.
Answer. A time series is a sequence of data points, measured typically at successive points in time
spaced at uniform time intervals........ Time series methods take into account possible internal
structure in the data, Time series data often arise when monitoring..... The analysis of time series
consists of two major steps: Identifying the various factors or influences which produce the
variations in the time series, and Isolating, analysing and measuring the effect of these factors
independently,byholdingother thingsconstant.The purposeof decompositionmodelsis to break a
time series into its components:

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