A Psychologist Has Developed a Workshop Designed to Increase the Degree

A psychologist has developed a workshop designed to increase the degree of optimism that people experience. She conducts a one-tailed independent samples t test with an α = .01 to determine if the workshop in fact improves optimism scores. Group A, consisting of 16 individuals, participated in the workshop and subsequently obtained a M₁ = 92 on an optimism assessment. Group B, consisting of 13 individuals, takes the assessment without attending the workshop and obtained a M₂ = 88. If the obtained t-value was +2.33, we could conclude that

A) the group that attended the workshop scored significantly higher on optimism than the group that didn't attend.
B) the group that attended the workshop scored higher than the group that didn't attend, but the difference between the means was not significant.
C) the null hypothesis should be rejected.
D) Both "a" and "c" above are correct.

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