The claim is that the IQ scores of statistics professors are normally distributed, with a mean greater than 133. A sample of 28 professors had a mean IQ score of 138 with a standard deviation of 6. Find the value of the test statistic

The value of the test statistic is 4.41

Step-by-step explanation:

Our test statistic is:

In which X is the mean of the sample, is the value of the claim, is the standard deviation and n is the size of the sample.

In this problem, we have that:

So

The value of the test statistic is 4.41

last one.

step-by-step explanation:

last one.

generally speaking, the others follow some sort of pattern that correlates to either linear (looks like a straight line) or sinusoidal (looks like an s).

the last one is just a random cloud of points that doesn't correlate to any particular known order.