Problem-1 in order to estimate the difference between the average miles per gallon of two different models of automobiles, samples are taken, and the following information is collected. model a model b sample size 50 55 sample mean 32 35 sample variance 9 10 a) at 95% confidence develop an interval estimate for the difference between the average miles per gallon for the two models. b) is there conclusive evidence to indicate that one model gets a higher mpg than the other? why or why not? explain.

Paula makes stained-glass windows and sells them to boutique stores. if her costs total $12,000 per year plus $4 per window for the frame. how many windows must she produce to earn a profit of at least $48,000 in one year if she sells the windows for $28 each? 1. define a variable for the situation. 2. write an inequality that represents her profit. note: revenue is money coming in. cost is money going out. profit is the difference between the revenue and the cost. in other words: revenue - costs profit 3.using words, describe how many windows she must sell to have a profit of at least $48,000.