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QUESTION 7 50 An algebra placement test was used to determine placement in mathematics courses. A sample of calculus studentsQUESTION 22 A random sample of 10 observations are selected from a normal population. Let X be the sample mean and s be the s

I only need #'s 8 and 22, note 22 is not A and 8 is not 606

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Answer #1

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 \mu.

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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