Skip to content
Free Excel Tutorials
  • Home
  • Excel For Beginners
  • Excel Intermediate
  • Advanced Excel For Experts

Data Analysis

  • Use Data Form to input, edit and delete records in Excel
  • How to combine 2 or more chart types in a single chart in Excel
  • Understanding Pivot Tables in Excel
  • How to calculate average last N values in a table in Excel
  • How To Sort One Column or Multiple Columns in Excel

References

  • Count rows with at least n matching values
  • How to use Excel MMULT Function
  • Basic INDEX MATCH approximate in Excel
  • Two-way lookup with VLOOKUP in Excel
  • How to use Excel FORMULATEXT function

Data Validations

  • Excel Data validation with conditional list
  • Excel Data validation allow uppercase only
  • Excel Data validation date in next 30 days
  • Excel Data validation date in specific year
  • Excel Data validation must not contain

CONFIDENCE.NORM function: Description, Usage, Syntax, Examples and Explanation

by

What is CONFIDENCE.NORM function in Excel?

CONFIDENCE.NORM function is one of Statistical functions in Microsoft Excel that returns the confidence interval for a population mean, using a normal distribution.
The confidence interval is a range of values. Your sample mean, x, is at the center of this range and the range is x ± CONFIDENCE.NORM. For example, if x is the sample mean of delivery times for products ordered through the mail, x ± CONFIDENCE.NORM is a range of population means. For any population mean, μ0, in this range, the probability of obtaining a sample mean further from μ0 than x is greater than alpha; for any population mean, μ0, not in this range, the probability of obtaining a sample mean further from μ0 than x is less than alpha. In other words, assume that we use x, standard_dev, and size to construct a two-tailed test at significance level alpha of the hypothesis that the population mean is μ0. Then we will not reject that hypothesis if μ0 is in the confidence interval and will reject that hypothesis if μ0 is not in the confidence interval. The confidence interval does not allow us to infer that there is probability 1 – alpha that our next package will take a delivery time that is in the confidence interval.

Syntax of CONFIDENCE.NORM function

CONFIDENCE.NORM(alpha,standard_dev,size)

The CONFIDENCE.NORM function syntax has the following arguments:

  • Alpha     Required. The significance level used to compute the confidence level. The confidence level equals 100*(1 – alpha)%, or in other words, an alpha of 0.05 indicates a 95 percent confidence level.
  • Standard_dev     Required. The population standard deviation for the data range and is assumed to be known.
  • Size     Required. The sample size.

CONFIDENCE.NORM formula explanation

  • If any argument is nonnumeric, CONFIDENCE.NORM returns the #VALUE! error value.
  • If alpha ≤ 0 or alpha ≥ 1, CONFIDENCE.NORM returns the #NUM! error value.
  • If standard_dev ≤ 0, CONFIDENCE.NORM returns the #NUM! error value.
  • If size is not an integer, it is truncated.
  • If size < 1, CONFIDENCE.NORM returns the #NUM! error value.
  • If we assume alpha equals 0.05, we need to calculate the area under the standard normal curve that equals (1 – alpha), or 95 percent. This value is ± 1.96. The confidence interval is therefore:Equation

Example of CONFIDENCE.NORM function

Steps to follow:

1. Open a new Excel worksheet.

2. Copy data in the following table below and paste it in cell A1

Note: For formulas to show results, select them, press F2 key on your keyboard and then press Enter.

You can adjust the column widths to see all the data, if need be.

Data Description
0.05 Significance level
2.5 Standard deviation of the population
50 Sample size
Formula Description Result
=CONFIDENCE.NORM(A2,A3,A4) Confidence interval for a population mean. In other words, the confidence interval for the underlying population mean for travel to work equals 30 ± 0.692952 minutes, or 29.3 to 30.7 minutes. 0.692952

Post navigation

Previous Post:

DCOUNT function: Description, Usage, Syntax, Examples and Explanation

Next Post:

231 Keyboard Shortcut Keys In Excel

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Learn Basic Excel

Ribbon
Workbook
Worksheets
Format Cells
Find & Select
Sort & Filter
Templates
Print
Share
Protect
Keyboard Shortcuts

Categories

  • Charts
  • Data Analysis
  • Data Validation
  • Excel Functions
    • Cube Functions
    • Database Functions
    • Date and Time Functions
    • Engineering Functions
    • Financial Functions
    • Information Functions
    • Logical Functions
    • Lookup and Reference Functions
    • Math and Trig Functions
    • Statistical Functions
    • Text Functions
    • Web Functions
  • Excel VBA
  • Excel Video Tutorials
  • Formatting
  • Grouping
  • Others

Logical Functions

  • AND function: Description, Usage, Syntax, Examples and Explanation
  • Return blank if in Excel
  • SWITCH function: Description, Usage, Syntax, Examples and Explanation
  • How to use Excel NOT Function
  • How to use Excel FALSE Function

Date Time

  • Get fiscal year from date in Excel
  • Calculate total hours that fall between two times in Excel
  • Display Days in month in Excel
  • Check If Two Dates are same month in Excel
  • Find Last Day of the Month in Excel

Grouping

  • Categorize text with keywords in Excel
  • If cell contains one of many things in Excel
  • Group times into unequal buckets in Excel
  • Group numbers at uneven intervals in Excel
  • Group arbitrary text values in Excel

General

  • Find Most Frequently Occurring Word in Excel Worksheet
  • How to fill cell ranges with random number from fixed set of options in Excel
  • Count cells that do not contain many strings in Excel
  • How to test a range for numbers in Excel
  • Subtotal invoices by age in Excel
© 2023 xlsoffice . All Right Reserved. | Teal Smiles | Abbreviations And Their Meaning