Delivery time. A grocery shop offering home delivery is interested in comparing delivery times of their products during two periods of the day: morning and afternoon.

They are concerned that car traffic may affect the delivery time. Given the following delivery times (in minutes)

of their products to the customer for a random sample of six orders each period, test if delivery times differ across these two periods.

Morning Afternoon 53 50 47 66 64 72 68 61 58 65 59 72