CA Foundation P3 · Chapter 13 · Question 8 of 9
A population has a standard deviation of 12. The standard error of the sample mean for a random sample of size 36 (drawn with replacement) is:
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: B) 2
Explanation
Standard error of the mean = σ/√n = 12/√36 = 12/6 = 2. Dividing by n instead of √n gives 12/36 = 1/3, and 6 is merely √36 (the divisor itself), not the standard error.
More Statistical Description of Data and Sampling MCQs
- Q1Data collected by an investigator directly from the source for a specific purpose are called:
- Q2In a frequency distribution with inclusive classes 10–19, 20–29, 30–39, the class boundaries of the class 20–29 are:
- Q3Which of the following graphs is used to locate the median of a frequency distribution graphically?
- Q4In a family budget of ₹18,000 per month, the expenditure on food is ₹4,500. In a pie chart of the budget, the angle of the food sector is:
- Q5The frequencies of five consecutive classes are 5, 8, 12, 15 and 10. The 'less than' cumulative frequency of the third class is: