Use the table to answer the question.
Group A 18 20 46 34 58 31 41
Group B 15 21 32 42 29 57 39
The table shows the times, in minutes, spent shopping by two different groups. First find the mean times each group spent shopping. Then determine the difference in the mean times. Round your answers to one decimal place.
To find the mean times each group spent shopping, we add up the values in each group and divide by the number of values.
Group A mean time = (18 + 20 + 46 + 34 + 58 + 31 + 41) / 7
= 248 / 7
≈ 35.4 minutes
Group B mean time = (15 + 21 + 32 + 42 + 29 + 57 + 39) / 7
= 235 / 7
≈ 33.6 minutes
To determine the difference in the mean times, we subtract the mean time of Group B from the mean time of Group A.
Difference in mean times = Group A mean time - Group B mean time
= 35.4 - 33.6
= 1.8 minutes
Therefore, the difference in the mean times is approximately 1.8 minutes.
The mean time spent shopping for Group A is:
(18 + 20 + 46 + 34 + 58 + 31 + 41) / 7 = 32.9 minutes
The mean time spent shopping for Group B is:
(15 + 21 + 32 + 42 + 29 + 57 + 39) / 7 = 34.3 minutes
The difference in the mean times is:
34.3 - 32.9 = 1.4 minutes
Rounded to one decimal place, the difference in the mean times is 1.4 minutes.