What is the standard error of the sample proportion


A survey of 400 students is selected randomly on a large univeristy campus. They are asked if they use a laptop in class to take notes. Suppose that based on the survey, 220 of the 400 students responded "yes".

a). What is the value of the sample proportion ^p ?

b). What is the standard error of the sample proportion?

c). Construct an approxinate 95% confidence interval for the true proportion p by taking +2SEs from the sample proportion.

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Basic Statistics: What is the standard error of the sample proportion
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