a recent report indicated that families in a certain county spend about $175 per week on groceries. To investigate whether families actually spend more per week, an economist selected a random sample of 500 households and found the sample mean to be $176.24 and the standard deviation of the sample to be $5.81. Is this enough evidence at the 55 significance level to reject the null hypothesis and claim that families in this county actually spend more than &175 per week?