Determine the f-percentile that is required to con- struct each of the following two-sided confidence intervals:
(a) confidence level = 95 %, degrees of freedom 12 (b) confidence level 95 %, degrees of freedom = 24 (c) confidence level 99% , degrees of freedom 13 (d) confidence level 99.9%, degrees of freedom 15

Saline iv fluid bags cost $64.20 for 24, 1000 ml bags from one supplier. a new supplier sells 500 ml bags for $2 each. the hospital uses about 10,000, 1000 ml bags each month. nurses report that about half of the bags are more than half full when they are discarded. if you are going to use only one supplier, which size bag provides the best deal, and how much will you save each month? compare the cost of the new supplier to the current one.

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

Suppose i pick a jelly bean at random from a box containing one red and eleven blue ones. i record the color and put the jelly bean back in the box. if i do this three times, what is the probability of getting a blue jelly bean each time? (round your answer to three decimal places.)