An experimenter wishes to have his confidence intervals width in a tight band, i.e. he doesn’t wish to have a broad range. What should he do?

OPTIONS

• Increase the confidence level
• Increase the sampling size
• Increase the significance level
• Increase the Power

ANSWER

Increase the sampling size

EXPLANATION

The Margin of Error can be reduced by increasing the sampling size, although significance level also plays an important part but “Increase the sampling size” is the best possible answer.