(1) How Much do College Students Spend on Textbooks? Textbook prices are major expenditure for most students. To determine how much college students spend per year on textbooks, a random sample of 50 students from local colleges and universities were asked how much they spent last year on textbooks. The amounts, in dollars, can be found in the file StudentTextbook.csv, which can be found in the announcement for this homework assignment and in the Additional Dataset folder in the Resources folder in iLearn. The sample has a mean x = 1183.12. (a) State the population and parameter of interest. (b) Use the information from the sample to give the best estimate of the population parameter. (c) Use StatKey or other technology, construct and interpret a 95% confidence interval. (d) Use StatKey or other technology, construct and interpret a 90% confidence interval. (2) Got Milk? In November 2001, the Ag Globe Trotter newsletter reported that 90% of US adults drink milk. The Upstate Farms cooperative fears that the 90% number is no longer accurate and that fewer US adults are drinking milk today. (a) Define the relevant parameter and state the null and alternative hypothesis (b) Indicate which of the following possible random sample results provides the most evidence for their (the Upstate Farms cooperative) claim? (i) Sample A: 94 of 100 US adults say they drink milk. (ii) Sample B: 85 of 100 US adults say they drink milk. (iii) Sample C: 89 of 100 US adults say they drink milk. (iv) Sample D: 60 of 100 US adults say they drink milk. Here is the rest of details provided Student Yearly Textbook Expenditure 1828 1768 2116 928 916 1564 1492 880 976 1072 1024 1192 1036 1336 1444 640 844 1324 424 1348 976 1900 892 808 988 1324 1912 1312 664 988 1036 1264 1240 1408 1492 1456 544 976 1504 1912 772 568 1576 796 1612 1204 832 544 1576 928