nesa10
12.03.2020 •
Mathematics
In 2004, the General Social Survey (which uses a method similar to simple random sampling) asked, "Do you consider yourself athletic?" For this question, 255 people said that they did out of 2373 randomly selected people. What is the 95% confidence interval for the proportion of all Americans who consider themselves athletic?
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Ответ:
(0.0974, 0.1226)
Step-by-step explanation:
We first find the sample proportion;
255/ 2373
0.11
The Z value for a 95% confidence interval is 1.960
Therefore;
0.11 +- 1.96 * √ (0.11(1 – 0.11))/2373
0.11 +- 1.96 * 0.00642
0.11 +- 0.0126
= 0.1226
= 0.0974
(0.0974, 0.1226)
Ответ:
The answer is 31.4
Step-by-step explanation: