The CEO of a large financial institution claims that, on average, their clients invest more than R750 000 per year in a portfolio. To test this claim at the 5% significance level, if it was found that a sample of 9 clients invested an average of R745 000 in the portfolio over the last year, with a standard deviation of R135 000 Determine the critical value of the test statistic.
Select one:
a. 1.321
b. 2.508
c. 1.96
d. 1.860
e. 1.645
