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# Confidence interval: Use of Blackberries by students at OSU

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Suppose you have drawn a simple random sample of 225 students from OSU.
In this sample, 45 students own Blackberries. Let &#960; denote the proportion of OSU students who own Blackberries. Construct a 95% confidence interval for &#960;.

Suppose you have drawn a simple random sample of 100 students from OSU
and recorded how much money each student spent on room and board in Fall 2009. For your sample, sample mean (X) is \$3500, and sample standard deviation (s) is \$1500. Let &#956; denote the mean of this population. Construct a 95% confidence interval for &#956;

https://brainmass.com/statistics/confidence-interval/confidence-interval-blackberries-students-osu-309727

#### Solution Preview

Problem: Suppose you have drawn a simple random sample of 225 students from OSU
In this sample, 45 students own Blackberries. Let π denote the proportion of OSU students who own Blackberries. Construct a 95% confidence interval for π.

Data: n p %
225 0.2 95

Standard Error, SE = Ö{p(1 - p)/n} = ...

#### Solution Summary

A Complete, Neat and Step-by-step Solution is provided in the attached file.

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