Answer:
Null Hypothesis, : 1300 KN/m^2
Alternate Hypothesis, : > 1300 KN/m^2
Step-by-step explanation:
We are given that a mixture of pulverized fuel ash and Portland cement to be used for grouting should have a compressive strength of more than 1300 KN/m^2.
Suppose compressive strength for specimens of this mixture is normally distributed with σ = 63.
<u><em>Let </em></u><u><em> = the true average compressive strength</em></u>
So, Null Hypothesis, : 1300 KN/m^2
Alternate Hypothesis, : > 1300 KN/m^2
Here, <u><em>null hypothesis states that</em></u> the compressive strength of pulverized fuel ash and Portland cement is less than or equal to 1300 KN/m^2.
On the other hand, <u>alternate hypothesis sates that</u> the compressive strength of pulverized fuel ash and Portland cement is more than 1300 KN/m^2.
So, this would be the appropriate null and alternative hypothesis.