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Testing of hypothesis

Advertisiments claims that learning a technique will improve the test scores for students
The scores of the ten randomly selected students are recorded before and after the technique. For each randomly selected sample, assume the distribution of the population is norma,=l.
At a=0.10 is there enough evidence to conclude that the technique improves test score?
Ho"&#956;d&#8805;0, Ha:&#956;d<0

Student: 1
Before Techni 68
After Techn 73

What is the critical value?
What is the stanadardized test statistic
At 0.10 is the enough evidence?

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