The mean for the amount of dirt removed at all three different water temperature by the two brand of laundry detergent are equal.
paraphrase it
The average amount of dirt taken out by both laundry detergent brands is the same for all three water temperatures.
The mean for the amount of dirt removed at all three different water temperature by the two brand of laundry detergent are not equal.
paraphrase it
The average amount of dirt removed by the two brands of laundry detergent varies across all three water temperatures.
The average amount of dirt removed for all three different water temperatures by the two brands of laundry detergent is the same.
The average amount of dirt removed by two different laundry detergent brands at three different water temperatures is the same.
