Sites: Global Q&A | Wits | MathsGee Club | Joburg Libraries | StartUps | Zimbabwe | OER

MathsGee is Zero-Rated (You do not need data to access) on: Telkom |Dimension Data | Rain | MWEB

1 like 0 dislike
14 views
A researcher plans to interview students to learn whether they have ever tried smoking. About 1100 students attend the school the researcher wishes to sample. What size sample would you recommend to this researcher? Provide details about various limits you placed when deciding upon this sample size.
| 14 views

0 like 0 dislike
Since smoking is a yes/no type response, samples for proportions would work. Sample sizes for various margins of error and for alpha $=.05$ and $.01$ appear below:

If alpha $=.05$
$\pm=1 \%, \mathrm{n}=988$
$\pm=2 \%, \mathrm{n}=755$
$\pm=3 \%, \mathrm{n}=542$
$\pm=4 \%, \mathrm{n}=389$
$\pm=5 \%, \mathrm{n}=285$

If alpha $=.01$
$\pm=1 \%, \mathrm{n}=1032$
$\pm=2 \%, \mathrm{n}=870$
$\pm=3 \%, \mathrm{n}=690$
$\pm=4 \%, \mathrm{n}=534$
$\pm=5 \%, \mathrm{n}=415$
by Diamond (89,036 points)

0 like 0 dislike
1 like 0 dislike
1 like 0 dislike
1 like 0 dislike
3 like 0 dislike
1 like 0 dislike
3 like 0 dislike
0 like 0 dislike
0 like 0 dislike
0 like 0 dislike
1 like 0 dislike
0 like 0 dislike
1 like 0 dislike
0 like 0 dislike
1 like 0 dislike
1 like 0 dislike
0 like 0 dislike
1 like 0 dislike
0 like 0 dislike
0 like 0 dislike
2 like 0 dislike
4 like 0 dislike
1 like 0 dislike
0 like 0 dislike
1 like 0 dislike
1 like 0 dislike
0 like 0 dislike
1 like 0 dislike
0 like 0 dislike
1 like 0 dislike
0 like 0 dislike
1 like 0 dislike
1 like 0 dislike
3 like 0 dislike