Two sample t test

#1
I was recently asked this question in an interview and I believe the approach is to use two sample t test.
 
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#4
help. i have entered a variable as numeric and scale in SPSS, n variable view it appears as scale. but when I analyze the groups by unpaired t-test, in the box independent sample t-test the variable appears as nominal. when apply the test after adding grouping variable in the other box, it says . one of the box is empty. Why