2 Reject or fail to reject the Ho Show the Math Ho Mu 23 H
Solution
Formulating the null and alternative hypotheses,
Ho: u >= 23
Ha: u < 23
As we can see, this is a left tailed test.
Thus, getting the critical t,
df = n - 1 = 24
tcrit = - 2.063898562
Getting the test statistic, as
X = sample mean = 20
uo = hypothesized mean = 23
n = sample size = 25
s = standard deviation = 8
Thus, t = (X - uo) * sqrt(n) / s = -1.875
Also, the p value is
p = 0.036506319
As |t| < 2.064 (or P > 0.025), we FAIL TO REJECT THE NULL HYPOTHESIS. [ANSWER]
