Final answer:
To test the claim that low temperatures in Pomona in June average at least 58 degrees F, a hypothesis test needs to be performed using a sample of 18 days from the past June.
Step-by-step explanation:
In order to test the claim that low temperatures in Pomona in June average at least 58 degrees F, we need to perform a hypothesis test using the given sample of 18 days from the past June.
Null hypothesis (H0): The average low temperature in Pomona in June is equal to 58 degrees F.
Alternative hypothesis (Ha): The average low temperature in Pomona in June is less than 58 degrees F.
We will calculate the test statistic and compare it to the critical value to make a decision. If the test statistic falls in the rejection region, we reject the null hypothesis and conclude that the low temperatures in Pomona in June are lower than 58 degrees F.