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In a study of two groups, the following results were obtained:

Group A: Sample size = 20, Sample mean = 22, Sample standard deviation = 10
Group B: Sample size = 25, Sample mean = 12, Sample standard deviation = 12

Which of the following statements is correct?

Mathematics 2016 NDA Mathematics 2016 NDA 2016

Options

Group A is less variable than Group B because Group A’s standard deviation is smaller.

Group A is less variable than Group B because Group A’s sample size is smaller.

Group A is less variable than Group B because Group A’s sample mean is smaller.

Group A is less variable than Group B because Group A’s coefficient of variation is smaller.