Business numbers

Test2verB_p2.xlsx

Prob 7

7. (16 pts) Daily demand for an item of stock is normally distributed with a mean of 400 items and a standard
deviation of 120 items. What is the probability that demand in a single day is:
	a. not more than 350 items, P(x <= 350)?
	b. greater than 500 items, P(x > 500)?

8. (16 pts) X is the drying time (minutes) of a certain production item, and Y is the output technical rating.
	x	y
	41	206	a. Obtain the least squares linear regression equation for tech rating based drying time
	9	557	for the 20 observations.
	44	350
	46	248
	17	725
	11	664
	3	548
	14	376
	1	377	b. Calculate the Pearson product moment correlation coefficient for drying time
	18	383	and tech rating.
	38	481
	24	452
	37	316
	33	567
	29	284
	5	637
	19	581
	22	409
	10	395
	28	445