# Confidence interval: Use of Blackberries by students at OSU

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.

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 μ denote the mean of this population. Construct a 95% confidence interval for μ

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.