Location is known to affect the number, of a particular item, sold by heb pantry. two different locations, a and b, are selected on an experimental basis. location a was observed for 18 days and location b was observed for 13 days. the number of the particular items sold per day was recorded for each location. on average, location a sold 39 of these items with a sample standard deviation of 8 and location b sold 49 of these items with a sample standard deviation of 4. select a 99% confidence interval for the difference in the true means of items sold at location a and b. a) o [-1242,-7582]
b) o132.76, 45.24]
c)。8 1.76, 94.24]
d) 0-1 6.03,-3.97]
e)。[42.76, 55.24]
f. none of the above