A professor believes the students in a statistics class this term are more creative than most other students attending the university. A previous study found that students at the university had a mean score of 35 on a standard creativity test, and the current class has an average score of 40 on this scale with an estimated population standard deviation of 7. The standard deviation of the distribution of means is 1.63.
1)The t score is
A) 0.71
B) 1.88
C) 0.10
D) 3.07
2)The effect size is
A) 0.71
B)0.10
C)1.88
D) 3.07
3)If there were 30 students in the class and the professor wanted to test the null hypothesis described in the scenario using the 5% level of significance, the cutoff t score would be
A) 1.699
B) 35.000
C) -0.113
D) -2.500
4)If a t test for dependent means is reported in a research article as "t (38) = 3.11, p < .01," then
A) the result is not significant.
B) there were 39 degrees of freedom.
C) you can assume a one-tailed test was used.
D) the result is significant.
5) If an experimenter conducts a t test for independent means and rejects the null hypothesis, the correct interpretation is that
A) the samples were from populations that were actually dependent rather than independent.
B) the mean of one sample is so far from the mean of the other sample that the samples must come from populations with different means.
C) the mean of one sample is statistically the same as the mean of the other sample, so they probably come from populations with equal means.
D) the variance of one sample is so much larger than the variance of the other sample that the variances of the parent populations must not have been the same after all.
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