Question

a sample of 350 orders for take-out food at local pizzeria found that the average cost of an order was $23 with s= $16
(a)find the margin of error, if we use 95% confidenceinterval, for the average cost if an order.
(b) interpret for management the margin of error.
(c) if we need to be 99% confident, does the confidence interval become wider or narrower
(d) find the 99% confidence interval

Answer 1

@welshfella

Answer 2

sorry - i've forgotten this stuff

Answer 3

im so lost