Because I formulated the alternative hypothesis for the golf ball example as > 20, this becomes a one-tail test. The hypothesis for this example is stated as:
*H*_{0} : µ ≤ 20 yards
*H*_{1} : µ > 20 yards

Where m = the mean increase in yards off the tee using my new golf ball.

Let’s say that I know that the standard deviation of the population, σ, is 5.3 yards and my sample size to test the hypothesis, *n,* is 40 golfers. For this example, we’ll set α = 0.01. The standard error of the mean, σ _{x}, will now be equal to:

Let’s assume the sample mean from the 40 golfers is 22.5 yards. What is our conclusion ...

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