I did the math on a word document; hopefully, the steps help. Remember to use a graphic calculator to solve it.
Answer: 2017
Step-by-step explanation:
Given : The proportion of people that smoke : p=0.3
Margin of error : E= 0.02
Significance level :
Critical value : 
The formula to calculate sample size ( if proportion is known) :-

Hence, the required minimum sample would be 2017.
Answer:
2+3+3=8
Step-by-step explanation:
You welcome
Answer: Stratified random sampling
Step-by-step explanation:
- A sampling technique that involves the split of a population into smaller groups known as strata on the basis of some categories and then selecting individuals from each strata is known as Stratified random sampling.
Here, group of mean and women are two strata, and selecting individuals from each of them .
That means, this sampling method is "Stratified random sampling".