# Sample size

Not what you're looking for?

A poll of 1400 randomly selected students in grades 6 through 8 was conducted and found that 30% enjoy playing sports. Would confidence in the results increase if the sample size were 3200 instead of 1400? Why or why not?

##### Purchase this Solution

##### Solution Summary

The solution calculates confidence intervals for different sample sizes.

##### Solution Preview

sample proportion= 30%

We have to estimate the population proportion from the sample proportion.

This will lie in a range called the confidence limits.

We have to calculate confidence interval for sample sizes

n= 1400

and

n= 3200

at the same level of significance alpha (a) , say = 5%

Confidence limits when n= 1400

p= 30.00%

q=1-p= 70.00%

n=sample size= 1400

sp=standard error of proportion=square root of (pq/n)= 1.23% =square root of ( ...

##### Purchase this Solution

##### Free BrainMass Quizzes

##### Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

##### Know Your Statistical Concepts

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.

##### Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

##### Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.