Question

4. With of 75, alpha is 0.10, the sample size is 25, and the sample standard deviation (s) is 5, the two side confidence interval is 75 ± 1.711.

True

False

5. When the sample standard deviation is 5, the sample size is 25, the accuracy is 3, and alpha is 0.10, the sample size according to that accuracy is 9.

True

False

Answer 1

Ans.

(4). The 90 percent confidence interval

= Xbar $\pm$t_critical*SD/{sqrt(n)}

= 75$\pm$1.71*5/sqrt(25)

= 75$\pm$1.71

The correct answer is True

(5).true