<u>Confidence interval for population proportion is </u>
<u>sample proportion +/- confidence coefficient*standard error of p </u>
<u>Sample proportion = p = x/n = 180/300 = 0.6 </u>
<u>Confidence coefficient is the critical value of z for 95% confidence level = 1.96 </u>
<u>Standard error of p = sqrt [p*(1-p)/n] </u>
<u>= sqrt [0.6*0.4/300] </u>
<u>= 0.0283 </u>
<u>The CI is </u>
<u>0.6 +/- 1.96*0.0283 </u>
<u>0.6 +/- 0.055 </u>
<u>lower boundary is 0.6-0.055 = 0.545 </u>
<u>upper boundary is 0.6+0.055 = 0.655 </u>
<u>The CI is (0.545, 0.655)</u>
the answer for the question above is 9/5
Answer:
D
Step-by-step explanation:
it was right on edge
16-20 are correct. <em>Remember to mark the first #20 as A</em>
The last #20 is wrong. The answer is B. 95 minutes.
10:55 - 11:00 = 5 minutes
11:00 - 12:00 = 60 minutes
<u>12:00 - 12:30</u> = <u>30 minutes</u>
Total = 95 minutes
