Midterm Exam Week 4

Midterm Exam Week 4
1

Answers:
SL. ANS SL ANS.
1 C 27 TRUE
2 D 28 0.324
3 B 29 0.623
4 A 30
Mean = 31.67, SD =
5.88, Median = 31.5,
Q1 = 26.75, Q3 =
35.75
5 C 31 0.416
6 D 32 68%
7 B 33 Active- control trial
8 D 34 0.103
9 C 35 Mean = 27.67, SD =
3.28, Median = 28
10 B 36 0.232
11 A 37 0.035
12 TRUE 38 0.209
13 TRUE 39 Cohort study, Case-
control study
14 FALSE 40 CI Men = 1.8%, CI
Women = 1.2%
15 TRUE 41 49.10%
16 FALSE 42 p =0.379
17 FALSE 43 SD = 4.3%
18 TRUE 44
Sensitivity = 0.124
Specificity = 0.028
False negative = 85
19 TRUE 45 RR = 0.907
20 TRUE 46
Mean = 3.168,
Median = 3.165, SD
= 0.236
21 FALSE 47 Sensitivity = 3.8%
22 TRUE 48 p = 0.956
23 TRUE 49 Upper limit = 236.58
24 TRUE 50 Proportion = 0.4625
25 TRUE 51 P(X > 280) = 0.191,
percentile = 32
26 TRUE 52 1.04%
2

Essay Type
Answer:
P = 0.24, n =7
P(X = 1) = C (7, 1)* 0.24^1 * (1 – 0.24) ^6 = 0.324 (Using Binomial)
Answer:
M = 120, S = 16
P(X > 115) = P (Z > (115 – 120)/16) = P(Z > - 0.3125) = 1 – 0.377 = 0.623
Answer:
25 27 31 33 26 28 38 41 24 32 35 40
Mean = (25 + 27 + 31 + 33 + 26 + 28 + 38 + 41 + 24 + 32 + 35+ 40)/12 =31.67
Ascending order:
2
4
2
5
2
6
2
7
2
8
3
1
3
2
3
3
3
5
3
8
4
0
4
1
Median = (12 + 1) / 2 = 6.5th observation = (31 + 32)/ 2 = 31.5
Q1 = (12 + 1) / 4 = 3.25th observation = (26 + 0.25 * (27 – 26)) = 26.25
Q3 = 3*(12 + 1) / 4 = 9.75th observation = (35 + 0.75 (38 – 35)) = 37.25
3

SL X X -
31.67
(X -
27.67)^2
1 25 -6.67 44.4889
2 27 -4.67 21.8089
3 31 -0.67 0.4489
4 33 1.33 1.7689
5 26 -5.67 32.1489
6 28 -3.67 13.4689
7 38 6.33 40.0689
8 41 9.33 87.0489
9 24 -7.67 58.8289
10 32 0.33 0.1089
11 35 3.33 11.0889
12 40 8.33 69.3889
Tot
al
380.
0 0.0 380.7
SD = √ 380. 7
11 = 5.88
Answer:
P (overweight) = 158 / 380 = 0.416
4