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AP STATISTICS 2010 SCORING GUIDELINES (Form B) Question 4 Intent of Question The primary goals of this question where to assess students ability to (1) calculate and interpret a confidence interval

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How to fill out confidence intervals student saturday

01

Determine the level of confidence you want to use for the interval. This is typically given to you.

02

Calculate the sample mean, which is the average of the data you have collected.

03

Determine the standard deviation of the data, which measures the variability or spread of the data.

04

Calculate the standard error, which is the standard deviation divided by the square root of the sample size.

05

Look up the critical value for the desired level of confidence in a standard normal distribution table or use a statistical software.

06

Multiply the standard error by the critical value to get the margin of error.

07

Subtract the margin of error from the sample mean to get the lower bound of the confidence interval.

08

Add the margin of error to the sample mean to get the upper bound of the confidence interval.

09

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

Who needs confidence intervals student saturday?

01

Confidence intervals are primarily used in statistics by students and researchers to estimate population parameters (such as a population mean) based on a sample. Students taking a statistics course or conducting research may need to calculate confidence intervals to make inferences about a population based on their sample. Confidence intervals allow them to estimate the range within which the population parameter is likely to fall with a certain level of confidence.

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