Course
MATH 225N Statistical Reasoning For The Health Sciences
MATH 225N Week 6 Assignment: Estimating Sample Size for a Population Proportion
- Question: Suppose an automotive repair company wants to determine the current percentage of customers who keep up with regular vehicle maintenance. How many customers should the company survey in order to … 90% confident that the estimated (sample) proportion is within 2 percentage points of the true population proportion of customers who keep up with regular vehicle maintenance?
- Question: Suppose a shoe store wants to determine the current percentage of customers who are males. How many customers should the company survey in order to … 90% confident that the estimated (sample) proportion is within 3 percentage points of the true population proportion of customers who are males?
- Question: Deborah wants to estimate the percentage of people who eat fast food at least once per week. She wants to create a 90% confidence interval which has an error bound of at most 3%. How many people should … polled to create the confidence interval?
- Question: Suppose an automotive repair company wants to determine the current percentage of customers who keep up with regular vehicle maintenance. How many customers should the company survey in order to … 95% confident that the estimated (sample) proportion is within 5 percentage points of the true population proportion of customers who keep up with regular vehicle maintenance?
- Question: Suppose a clothing store wants to determine the current percentage of customers who are over the age of forty. How many customers should the company survey in order to … 92% confident that the estimated (sample) proportion is within 3 percentage points of the true population proportion of customers who are over the age of forty?
- Question: Suppose an automotive repair company wants to determine the current percentage of customers who keep up with regular vehicle maintenance. How many customers should the company survey in order to …90% confident that the estimated (sample) proportion is within 5 percentage points of the true population proportion of customers who keep up with regular vehicle maintenance?
- Question: Suppose a shoe store wants to determine the current percentage of customers who are males. How many customers should the company survey in order to … 98% confident that the estimated (sample) proportion is within 3 percentage points of the true population proportion of customers who are males?
- Question: Virginia wants to estimate the percentage of students who live more than three miles from the school. She wants to create a 95% confidence interval which has an error bound of at most 5%. How many students should … polled to create the confidence interval?
- Question: Suppose an automotive repair company wants to determine the current percentage of customers who keep up with regular vehicle maintenance. How many customers should the company survey in order to … 95% confident that the estimated (sample) proportion is within 2 percentage points of the true population proportion of customers who keep up with regular vehicle maintenance?
- Question: Emma wants to estimate the percentage of people who use public transportation. She surveys 140 individuals and finds that 100 use public transportation. What is the sample proportion for successes, p′?
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