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<b>Test and CI for Two Proportions </b> | <b>Test and CI for Two Proportions </b> | ||
<table width="50%" border="1"> | <table width="50%" border="1"> | ||
<tr> | <tr> | ||
<td><div align="center">Sample</div></td> | <td><div align="center">Sample</div></td> | ||
| Line 39: | Line 20: | ||
<tr> | <tr> | ||
<td><div align="center">1</div></td> | <td><div align="center">1</div></td> | ||
<td><div align="center"> | <td><div align="center">56</div></td> | ||
<td><div align="center"> | <td><div align="center">814</div></td> | ||
<td><div align="center">0. | <td><div align="center">0.068796</div></td> | ||
</tr> | </tr> | ||
<tr> | <tr> | ||
<td><div align="center">2</div></td> | <td><div align="center">2</div></td> | ||
<td><div align="center"> | <td><div align="center">28</div></td> | ||
<td><div align="center"> | <td><div align="center">813</div></td> | ||
<td><div align="center">0. | <td><div align="center">0.034440</div></td> | ||
</tr> | </tr> | ||
</table> | </table> | ||
Revision as of 16:34, 26 September 2009
Flu Shots
The Wall Street Journal of September 24, 2009 reports on a study in the current issue of the New England Journal of Medicine dealing with the efficacy of flu shots during the “2007-2008 flu season.” There were “1952 healthy adults who received either a placebo or one of two [types of] vaccinations,” either a shot or a spray.
“Of the 813 volunteers who received the flu shot, 28 of them or 3.4%, later developed a confirmed case of influenza. In the FluMist group; 56 of the 814 volunteers, or 6.9% developed the flu, while 10.8% of the placebo group had confirmed flu cases.”
Discussion
1. Here is the Minitab output for the comparison between the two forms of vaccination:
Test and CI for Two Proportions
Sample |
X |
N |
Sample p |
1 |
56 |
814 |
0.068796 |
2 |
28 |
813 |
0.034440 |