Sample Size Advances in technology are dramatically affecting different aspects of our lives. For example, the number of daily print newspapers is decreasing because of easy access to Internet and television news. To help address such issues, we want to estimate the percentage of adults in the United States who use a computer at least once each day. Find the sample size needed to estimate that percentage. Assume that we want 95% confidence that the sample percentage is within two percentage points of the true population percentage.
The data shows that the confidence level is 95% and E=2%.
If the estimated proportion are not known, then the equal proportion takes for the p-hat and q-hat which is equal to 0.5.
For 95% confidence level,
From Table of the standard normal distribution, the z-score value for 0.975 is 1.96.
Step by step
Solved in 2 steps with 2 images
