

0.77 
Here we need to use two sample independent ttest. Because the sample is taken randomly from both the groups.
next we need to decide "is it pooled ttest or unpooled ttest?"
For this we need to test equality of two variances.
Null hypothesis:
H_{0} : both the variances are equal
Alternative hypothesis:
H_{a} : They are different.
Let's use minitab:
Step 1) Click on Stat >>>Basic Statistics >>>2Variances ...
Fill the necessary information and then click on Option again fill the necessary information.
Look the following image:
Then click on OK again Click on OK , so we get the following output:
From the above output, the pvalue is as follow:
pvalue = 0.352
Since pvalue > 0.05 we fail to reject the equality assumption of two populations.
So that the pooled procedure more appropriate in this situation.
that is we need to used pooled ttest.
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