Mixed Practice #1-Confidence Intervals
1. In an effort to estimate the proportion of women who support a particular candidate, al
pollster calls a random selection of 312 women and 49% of them indicate support.
a. Is it appropriate to use a Normal model to describe the sampling distribution of p.
Check the appropriate assumptions and conditions.
Random:
Independent
10% Condition:
Successes/Failures:
b. Find the 95% confidence interval (using z*=1.96).
Recall: 0 + (z*)(SE)