Question

Help plz
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Answer 1

Looks like the question is testing you on your knowledge to assign parameters in a 2 sample t-test. Easy question.

The answer you chose is incorrect.

First, the null hypothesis should always be that \(μ_1=μ_2\), or alternatively, \(μ_2-μ_1=0\). This eliminates choices B and C, leaving A and D.

Now the test is to be taken on the interest of seeing if there is a significant difference in customer satisfaction ratings. If there was a difference, then subtracting the two would lead to some difference (alternative hypothesis). What do you think is your alternate hypothesis?
\(μ_2-μ_1≠0\) or \(μ_2-μ_1<0\) ? Which alternate hypothesis suggests a difference?

That would help you choose between A and D