I only need #'s 8 and 22, note 22 is not A and 8 is not 606
Question 8
Population proportion = p = 0.09
stanard error of proportion = sqrt [p * (1-p)/n] = sqrt [0.09 * 0.91/n]
Margin of error = 3% = 0.03
Critical test statistic for 99% confidence interval = 2.586
so here
0.03 = 2.586 * sqrt [0.09 * 0.91/n]
n = (2.586/0.03)^{2} * 0.09 * 0.91
n = 603.7756
or n = 604
Question 22
Sample size = n = 10
Here degree of freedom = 10 - 1 = 9
Here it is asked that which of the following is not a 95% confidence interval of population mean .
Here option a is a 95% confidence interval. Option b, Option C, Option D are also 95% confidence interval but not a symmetric one.
But here the answer is option e as this is not a 95% confidence interval as 0.045 + 0.01 = 0.055 not equals to 0.05.
Here the question is tricky as it asked not a 95% confidence interval.
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