Basic Applied Statistics 200
Solutions to Practice Midterm 1

 (iii)more than
 (iii) more variable
 (iii) skewed right
 (iii) more
 (i) Five Number Summary because mean and s.d. would be distorted by
outliers

 Use stems 0,0,1,1,2 or 0,0,0,0,0,1,1,1,1,1,2
 no; neither stemplot is bellshaped
 1, 2.5, 10, 13.5, 20
 6: this is the typical distance of values from their mean: 1 would be too
small, 16 too large

 z>.44 same as z<.44; proportion is .3300
 .0228.0013=.0215
 1.64 or 1.65

 between 270 and 730
 x<300 same as z<(300500)/115=1.74; proportion is .0409
 the mean, 500
 .15 above same as .85 below; z=1.04 so x=500+1.04(115)=619.6

 MALES: 13/20=.65 vs.females 19/54=.35
 35/42=.83
 35/74=.47

 height
 (i) positive (iii) linear (v) strong
 positive square root of .623 = .79
 same because r is independent of units
 15.4+.364(67) = 9
 observed minus predicted = 89 = 1
 (iii) because minitab shows R and X
 increase
 (i) (see first paragraph page 119)

 (i) observational study; you can't make teens be adjusted or eat with
their families
 (i)
 (iii)

 Pitt students
 3 times 2 = 6

 (ii)
 (i)
 (i)
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