One-sample z tests are seldom used because _____. a. the ...

[jilianpiloj]

One-sample z tests are seldom used because _____.
 
  a. the population mean and standard deviation are seldom both known
  b. the sample mean and standard deviation are seldom both known
  c. the calculations are too complex
  d. no conclusions can be drawn from the results of the test

Question 2

When a large z value is found when we compare a single sample to a population, we may deduce that _____.
 
  a. chance is a likely explanation for the difference
  b. something went wrong in our calculations
  c. the independent variable probably had no effect
  d. chance is not a likely explanation for the difference

[coyin]

Answer to Question 1

A
Populations are usually so large that we never know their standard deviations.

Answer to Question 2

D

[jilianpiloj]

Thanks for the timely response, appreciate it

[Dnite]

Great answer, keep it coming