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201920Extracurricular HandbookSilsbeeIndependent School DistrictValues. Skills. Confidence. Table of Contents Preface .......................................................................................................................................................

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How to fill out a confidence interval for

01

To fill out a confidence interval, follow these steps:

02

Determine the level of confidence you want to use for the interval. Common choices include 90%, 95%, and 99%.

03

Collect a sample of data that represents the population you are interested in. The sample should be randomly selected and representative.

04

Calculate the mean of the sample. This is the average value of the data points in the sample.

05

Determine the standard deviation of the sample. This measures the variability or spread of the data points in the sample.

06

Determine the sample size. This is the number of data points in the sample.

07

Use a statistical formula to calculate the margin of error. This is the range within which the population parameter is likely to fall.

08

Calculate the lower and upper bounds of the confidence interval by subtracting and adding the margin of error to the sample mean, respectively.

09

Write the confidence interval as a range, such as (lower bound, upper bound).

10

Interpret the confidence interval by stating: 'I am ___% confident that the true population parameter falls within this interval.'

Who needs a confidence interval for?

01

A confidence interval is useful for anyone who wants to estimate a population parameter based on a sample of data. It is commonly used in scientific research, market research, quality control, and data analysis. Researchers, statisticians, analysts, and decision-makers often rely on confidence intervals to make inferences and draw conclusions about a population based on limited sample information. Confidence intervals provide a measure of uncertainty and help quantify the precision of an estimate.

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