Example 8.3 Find n for One Sample, Dichotomous Outcome where z is the value from the standard normal distribution reflecting the confidence level that will be used, E is the n = p(1-p E desired margin of error, and p is the proportion of successes in the population dacinss Planning study to estimate proportion of freshmen who currently smoke Want estimate within 5% of the true proportion and will use 95% confidence level Problem 2 Determination of Sample Size for One Sample Dichotomous Outcome Suppose a similar study was conducted two years ago and found that the prevalence of smoking was 27% among freshman. If the investigator believes that this is a reasonable estimate of prevalence today, how many subjects P-6.27 would be needed?

Question

Using Example 8.3 from the first submitted image, solve the problem for the second submitted image.

Example 8.3
Find n for One Sample, Dichotomous Outcome
where z is the value from the standard
normal distribution reflecting the
confidence level that will be used, E is the
n = p(1-p
E
desired margin of error, and p is the
proportion of successes in the population
dacinss
Planning study to estimate proportion of freshmen who
currently smoke
Want estimate within 5% of the true proportion and will use
95% confidence level

Image Transcription

Example 8.3 Find n for One Sample, Dichotomous Outcome where z is the value from the standard normal distribution reflecting the confidence level that will be used, E is the n = p(1-p E desired margin of error, and p is the proportion of successes in the population dacinss Planning study to estimate proportion of freshmen who currently smoke Want estimate within 5% of the true proportion and will use 95% confidence level

Problem 2 Determination of Sample Size for
One Sample Dichotomous Outcome
Suppose a similar study was conducted two years ago
and found that the prevalence of smoking was 27%
among freshman.
If the investigator believes that this is a reasonable
estimate of prevalence today, how many subjects
P-6.27
would be needed?

Image Transcription

Problem 2 Determination of Sample Size for One Sample Dichotomous Outcome Suppose a similar study was conducted two years ago and found that the prevalence of smoking was 27% among freshman. If the investigator believes that this is a reasonable estimate of prevalence today, how many subjects P-6.27 would be needed?

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