An experiment is conducted with two groups of 25 college students. The treatment group scored an average of 3.67 with a standard deviation of 0.86 . The placebo group scored an average of 3.29 with a standard deviation of 0.97 . Calculate a 95 pooled confidence interval for the difference in means between the treatment and the placebo.
a. (0.44, 0.82)
b. (0.14, 0.90)
c. (0.25, 1.01)
d. None of the above
Question 2
When a random sample is to be taken from a population and a statistic is to be computed, the statistic can also be thought of as
a. a parameter.
b. a random variable.
c. a standard error.
d. a sample.
