8.3 confidence intervals for proportions

Question 1

notation

Answer 1

p is population proportion of people in specified category
x is the number of individuals in the sample who are in the specified category
n is the sample size
p hat is the sample proportion of individuals who are in the specified category. p hat is defined a p hat=x/n

Question 2

Assumptions/aka how to see if the sample distribution is approximately normal

Answer 2

1. we have a simple random sample
2. the population is at least 20 times as large as the sample
3. the items in the population are divided into two categories
4. the sample must contain at least 10 individuals in each category

Question 3

confidence intervals on the ti-84 plus

Answer 3

1-propZint commaned in STAT then TESTS