Bcom Bachelor of Commerce Business Statistics

Question 1

Which measure of central tendency is most affected by extreme outliers?

Accepted Answer

Mean

Answer

Median

Answer

Mode

Answer

Weighted average

Question 2

What does 'standard deviation' measure?

Accepted Answer

The average spread of data points from the mean

Answer

The difference between the highest and lowest values

Answer

The middle value in a dataset

Answer

The most frequently occurring value

Question 3

In hypothesis testing, what is the 'null hypothesis' (H₀)?

Accepted Answer

A statement of no effect or no difference that the test attempts to reject

Answer

The researcher's expected result

Answer

The alternative explanation

Answer

A hypothesis with zero probability

Question 4

What is a 'p-value' in statistical testing?

Accepted Answer

The probability of observing the test result, or more extreme, assuming the null hypothesis is true

Answer

The probability that the alternative hypothesis is correct

Answer

The confidence level of the test

Answer

The sample size required

Question 5

Which type of data can only take specific, separate values (e.g., number of customers)?

Accepted Answer

Discrete data

Answer

Continuous data

Answer

Nominal data

Answer

Ordinal data

Question 6

What is the 'coefficient of variation' (CV)?

Accepted Answer

Standard deviation divided by the mean, expressed as a percentage

Answer

Variance divided by the median

Answer

Mean divided by range

Answer

Correlation coefficient times variance