If the mean of a dataset is 15 and the sum of squared deviations from the mean is 90 for 10 observations, the variance is: MCQ with Answer and Explanation

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If the mean of a dataset is 15 and the sum of squared deviations from the mean is 90 for 10 observations, the variance is:

A. 8.1

B. 10

C. 9

D. 90

Answer: Option C

Solution (By JKExamLibrary)

Population variance = 90/10 = 9. Sample variance = 90/9 = 10, but usually variance of the data (population) is 9 if it's the whole set. I'll assume population.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1 Report Error

To study the opinion of employees about a new HR policy, the HR department sends an email link to a survey. The respondents voluntarily participate. This is a:

A. Voluntary response sample

B. Probability sample

C. Simple random sample

D. Stratified sample

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
When respondents self-select, the sample is not probability-based and may be biased; this is a voluntary response sample.

This question belongs to: Accountancy and Statistics Statistics