Given a normal distribution with a mean of 80 and a standard ...

[bobbysung]

Given a normal distribution with a mean of 80 and a standard deviation of 20, an observation of x = 50 corresponds to a standard normal deviate:
 a. of z = +1.5
  b. of z = +3.0
  c. of z = 1.5
  d. of z = 3.0
  e. of none of these

Question 2

If you wish to construct a confidence interval estimate for the difference between two population means, an increase in the sample sizes used will result in:
 a. a decrease in the critical value z
  b. a narrower confidence interval
  c. a wider confidence interval
  d. a confidence interval that contains zero
  e. a confidence interval that does not contain zero

[millet]

Answer to Question 1

C

Answer to Question 2

B

[bobbysung]

Thanks for the timely response, appreciate it

[raenoj]

Excellent