A water utility company wishes to assess the effectiveness of an advertising campaign to reduce water consumption. Before the campaign, the utility company reported a daily usage of 46 gallons per household. After the advertising campaign, the utility company randomly selects 100 households throughout the region and records water usage for a day? The household average water usage after the campaign was 42.26 gallons with a standard deviation of 6.92 gallons. Using a 95% confidence level, use a hypothesis test for the mean to see if the average household water usage after the campaign decreased.

a. State your null and alternate hypotheses. Is this a one-sided or two-sided test?