Question

To test u = 20 versus H(1) u is less than 20 a simple random sample of size = 19 is obtained from a population that is known to be normally distributed answer parts (a) - (d)

(a) If x bar = 18.4 and s =4.2 compute the test statistic.

(b) Draw a t-distribution with the area that represents the P-value shaded.

(c) Approximate the P-Value:

Choices: 0.15 is less than P-value less than 0.20;

0.20 less than P-value less than 0.25;

0.10 less than P-value less than 0.25;

0.05 less than P-value less than 0.10

(d) if the researchers decides to test this hypothesis at the a = 0.05 level of significance, will the researchers reject the null hypothesis? and why.

Answer 1