You are interested in whether the average lifetime of Duracell AAA batteries is different from the average lifetime of Energizer AAA batteries. You lay out your hypotheses as follows: Null Hypothesis: μ1 = μ2, Alternative Hypothesis: μ1 ≠ μ2. After running a two independent samples t-test, you see a p-value of 0.2756. What is the appropriate conclusion?
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Decision rule based on p-value and given level of significance (
) :
If level of significance is not given then take it as 0.05
1) If p-value < level of significance (alpha) then we reject null hypothesis
2) If p-value > level of significance (alpha) then we fail to reject null hypothesis.
Here p value = 0.2756 > 0.05 so we used 2nd rule.
That is we fail to reject null hypothesis
Conclusion: At 5% level of significance there are not sufficient evidence to support alternative hypothesis.
So correct option is 3.
We did not find enough evidence to say a significant difference exists between the average lifetime of Duracell AAA batteries and the average lifetime of Energizer AAA batteries.
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