PSYC 2317 EXAM 1
1. A. Create a frequency distribution with the following data:
42 33 34 42 31 45 12 13 47 42
50 22 32 41 22 25 33 47 25 49
X f cum f p % cum %
46-50 4 20 .20 20 100
41-45 5 16 .25 25 80
36-40 0 11 0 0 55
31-35 5 11 .25 25 55
26-30 0 6 0 0 30
21-25 4 6 .20 20 30
16-20 0 2 0 0 10
11-15 2 2 .10 10 10
B. Calculate the following probabilities with µ=10 and σ=3.
p(X > 11.5)
z= .5
p= .3085
p(X < 12.3)
z= .77
p= .7774
p(11.4 < X < 12.7)
z= -47
z= .90
p= .1351
p(8.2 < X < 10.4)
z= -.6
z= .13
p= .2774
p( M < 10.1); n=100
z= .33
p= .6293
p( 10.2 < M < 10.4); n=25
z= .33
z= .67
p= .1193
p( 9.8 < M < 10.23); n=64
z= -.53
z= .61
p= .4310
p( 9.75 < M 9.88); n=16
z= -.33
z= -.16
p= .0657
p( M > 8.0); n=16
z= -2.67
p= .9962
p( M > 8.0); n=100
z= -6.67
p=1
Top Related