Answer: A
Explanation:
Since the number of samples, n is 25, we would determine the degree of freedom, df
df = n - 1 = 25 - 1
df = 24
Given the test statistic = 2.21 and the test is a two-tailed test, we would determine the probability value using the t test calculator.
At significant level of 0.05,
P value = 0.037
At significant level of 0.01,
p value = 0.037
The decision rule is that:
We would reject the null hypothesis if significant level is > p value
Therefore,
A. Reject the null hypothesis with alpha = 0.05 but fail to reject with alpha = 0.01