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Confidence Interval Calculator

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Confidence Interval Calculator on GoojDex




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    Upper and Lower Bound Calculator

    The confidence interval calculator is an online calculator to find lower bound and upper bound statistics.

    Upper and lower bound calculator

    • lower bound calculator
    • upper bound calculator

    Here are the major steps of using this confidence interval calculation tool.

    • Enter Confidence Level, Mean, Sample Size, and Standard Deviation

    When you are using this tool, a total of four inputs need to be entered. These include the confidence level which is in percentage form, mean value, the value of SD, and the size of the sample. Consider that the confidence level is 80%, the mean is 20, the sample size is 15 and the standard deviation is 12. Simply enter these values in the text boxes provided. After that, you only have to click the calculate button to produce the output.

    • Checking the values of the confidence interval, lower bound, and upper bound

    In accordance with the input values entered by the user, a total of three outputs are produced.  These include the lower bound, upper bound, and confidence interval. Let us consider the values mentioned above.

    1. My confidence level is 80%
    2. Mean is 20
    3. The sample size is 15
    4. The standard deviation is 12.

    When you enter the input values listed above, the following results would be shown on your screen.

    • The lower bound is 16
    • Upper Bound is 24
    • Confidence Interval is 3.97

    However, you can also calculate the average confidence interval by using an average calculator

    by entering multiple confidence interval values.


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