What is the difference between Z-test and T-test in this tool?

The tool uses a Z-test if you provide a known population standard deviation. If you leave it blank, it defaults to a T-test, which is appropriate for smaller samples or when the population standard deviation is unknown.

What confidence level should I choose?

95% is the industry standard for most scientific and business research. Choose 99% for higher precision or 90% if a wider margin of error is acceptable.

Can I analyze specific columns from my CSV?

Yes, use the 'Columns to Analyze' field to specify column names. If left empty, the tool will automatically detect and process all numeric columns.

What happens if my data contains non-numeric values?

The tool is designed to process numeric data. Non-numeric columns will be ignored during the calculation process.

Is my data stored on your servers?

No, all calculations are performed locally in your browser. Your data is not uploaded or stored.

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Data Analysis

Confidence Interval Calculator

Calculate confidence intervals for population means using Z or T distributions

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Inputs

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6 options

ContentPaste or type the main input values.3

CSV Data InputtextareaRequiredKnown Population Standard Deviation (optional)textOptionalIf the population standard deviation is known, use Z-test. Otherwise, T-test will be used with sample standard deviation.Columns to Analyze (optional)textOptionalSpecify which columns to analyze. If empty, all numeric columns will be automatically detected and analyzed.

SettingsAdjust formats, ranges, numbers, and modes.2

Confidence LevelselectRequiredOutput FormatselectRequired

TogglesEnable or disable optional behavior.1

First Row Contains HeaderscheckboxOptionalEnabled when checkedTreat first row as column headers

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Confidence Interval Calculator

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