In a hypothesis test with hypotheses and , a random sample of 24 elements selected from the population produced a mean of 59.9 and a standard deviation of 14.9. The test is to be made at the 5% significance level. Assume the population is normally distributed. Required:
a. What is the value of the test statistic, t?
b. What is the critical value of t?

A180 degree clockwise rotation can be mapped as two 90-degree rotations.  rotating a figure 90 degrees clockwise maps the point (x, y) to (y, -x).  doing this again maps the new point (y, -x) to (-x, -y).rotating a figure 90 degrees counterclockwise maps the point (x, y) to (-y, x).  doing this again maps the new point (-y, x) to (-x, -y).they map the points to the same location.