If a dataset has values ranging from 10 to 95 and you decide to use a class width of 10, how many classes would be needed for an exclusive frequency distribution? MCQ with Answer and Explanation
If a dataset has values ranging from 10 to 95 and you decide to use a class width of 10, how many classes would be needed for an exclusive frequency distribution?
A. 8
B. 10
C. 11
D. 9
Answer: Option D
Solution (By JKSSB Mock Tests)
Range = 95 - 10 = 85. Number of classes = Range / Class width = 85 / 10 = 8.5, rounded up to 9 classes to cover the entire data range without gaps.
Assertion (A): Mailed questionnaire method is suitable when the informants are illiterate. Reason (R): Mailed questionnaire does not require any personal interaction. Choose the correct option:
A.A is false, R is true
B.Both A and R are true, but R is not the correct explanation of A
C.A is true, R is false
D.Both A and R are true, and R is the correct explanation of A
Explanation:
Mailed questionnaire is unsuitable for illiterates because they cannot read/write. The reason (no personal interaction) is true but does not make it suitable for illiterates; in fact, it makes it worse.
Explanation:
Direct standardization requires stable age-specific rates for the study group; if these are unreliable (e.g., small areas), indirect standardization (using standard rates) is more appropriate.
Explanation:
WPI reflects price changes at the wholesale/producer level, serving as an early indicator of inflationary pressures in the production pipeline before they reach consumers via CPI.
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