Answer: To determine the correct answer, we need to calculate the t-test statistic using the given information.
The formula for the t-test statistic for a one-sample t-test is:
t = (x - μ) / (s / sqrt(n))
where x is the sample mean, μ is the hypothesized population mean (which is not given in this question), s is the sample standard deviation, and n is the sample size.
Here, x = 63.2 minutes, s = 7.7 minutes, and n = 24 cases. We are not given a hypothesized population mean, so we cannot calculate the exact t-test statistic. However, we can use the sample mean as an estimate of the population mean for the purposes of this question.
Plugging in the values, we get:
t = (63.2 - 60) / (7.7 / sqrt(24))
t = 2.04
Therefore, the correct answer is (a) t = 2.04.