CONFIDENCE.NORM Excel Function

CONFIDENCE.NORM Function in Excel

The CONFIDENCE.NORM function calculates the confidence interval for a population mean using a normal distribution. It’s a powerful tool for statistical analysis in various fields.

Syntax and Parameters

CONFIDENCE.NORM(alpha, standard_dev, size)

• alpha: Significance level (e.g., 0.05 for 95% confidence)
• standard_dev: Population standard deviation
• size: Sample size

Applications

• Quality control in manufacturing
• Market research analysis
• Scientific studies and experiments
• Financial risk assessment
• Educational performance evaluation

Example Usage

=CONFIDENCE.NORM(0.05, 1.5, 100)

This calculates the confidence interval for a population mean with 95% confidence, 1.5 standard deviation, and a sample of 100.

Common Issues

• Incorrect input of parameters
• Misinterpretation of results
• Assuming normal distribution inappropriately

Key Benefits

• Estimating population parameters
• Assessing data reliability
• Supporting informed decision-making

Note: The function is available in Excel 2010 and later versions, including Microsoft 365.