C 00025 pvalue 0001 reject Ho E None of aboveSolutionFormul
C.) 0.0025< p-value < 0.001, reject Ho
E.) None of above
Solution
Formulating the null and alternative hypotheses,
Ho: u = 50
Ha: u =/ 50
As we can see, this is a two tailed test.
Thus, getting the critical z, as alpha = 0.05 ,
alpha/2 = 0.025
zcrit = +/- 1.959963985
Getting the test statistic, as
X = sample mean = 45
uo = hypothesized mean = 50
n = sample size = 100
s = standard deviation = 17.5
Thus, z = (X - uo) * sqrt(n) / s = -2.857142857
Also, the p value is
p = 0.0042
As P < 0.05, we REJECT THE NULL HYPOTHESIS.
Hence
OPTION D.) p-value = 0.0042 and \\alpha=0.05; reject Ho [ANSWER]
