Coursepack, p. 660 MAT 133: Ch. 9 Review WS p.4 - Fast 7. During the 2018-19 academic year, a researcher gathered data on the tuition and fees from a random sample of 40 public, two-year Colleges in the U.S. (there were 987 of these Colleges in all) and found that the average tuition (and fees) charged was $3991, with a standard deviation of $1505. (Source) = J.( 81=39 X=3991 5= 1505 n=40 conf=90%(10) a. Verify that the conditions are met in order to construct a confidence interval for u. 2 20.1 2f= n-1( 40- 1) = 39 Random: yes t= 90% = 1.6849 Indep8 yes Sample size - 10 you E= ton E= 1.6849.. 1505 140 = 400. 935 (35 90. 065, 4391.935) b. Construct a 90% confidence interval for u. (Show formula, substitution, and result.) Formula P+ WHAT ? 1 P=0.21 # 3590.06 , 4 391 935)