What sample size should be used if we would like to estimate the ...

[EY67]

What sample size should be used if we would like to estimate the mean age of the individuals who are attend a university with a 95 confidence interval that has a width of at most 5 years? Assume the population is normally distributed with a standard deviation of 4.2 years.
 a. The sample size should be 8.
 
  b. The sample size should be 11.
 
  c. The sample size should be 19.
 
  d. The sample size should be 10.

Question 2

In a one-way ANOVA test, we conclude there are differences across population means if the:
 a. between variation is small relative to the within variation
  b. between variation and within variation are equal
  c. between variation is large relative to the within variation
  d. between variation equals zero

[paavo]

Answer to Question 1

b

Answer to Question 2

c

[EY67]

Excellent

[duy1981999]

Thanks for the timely response, appreciate it