To compare the treatment effect of two medications, two independent samples of patient performance data were collected.

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To compare the treatment effect of two medications, two
independent samples of patient performance data were collected. The
sample sizes are 15 and 18 respectively. Assuming that the two
populations shared the same variance, the researchers decided to
conduct a two independent samples test for the means. They found
that the difference between the two sample means was 4.0 and the
pooled sample standard deviation of the two samples was 4.2. What
would be the obtained t-value under the null hypothesis that
assumes no difference between the two population means? Group of
answer choices 2.04 2.72 1.38 2.38