A)You are comparing mean spending amounts for single versus married customers. You do not know the population standard deviations. Your sample sizes will be 191 single customers and 191 married customers. In any calculation that uses degrees of freedom, the correct value to use for degrees of freedom is: The answer is 380 but I want to know how you get that?

B)You are trying to show that the proportion of your customers who have food allergies is less than 0.43. You sample 1,225 customers, and in that sample, 0.21 have food allergies. To find the test statistic, divide _____ by the standard error. Do not round. The answer is -0.22 but I want to know how you get that?