Need help-STAT2112.13


Need help-STAT2112.13
Quiz #
8
(last)
NAME:____________________GWID:G_________________
Fall 201
6
sba
(Take Home)
Due
on Tuesday office Hour (5pm)
Rome
Hall
Questions 1
3
are based on the following
quarterly
data collected on
the
average nights
foreign
tourists
spent in
Washington DC
area
from 2011
2016 (
quarterly
data)
.
Time
Average Stay (
nights
)
Mar
11
1
41.7
Jun
11
2
24
Sep
11
3
32.3
Dec
11
4
37.3
Mar
12
5
46.2
Jun
12
6
29.3
Sep
12
7
36.5
Dec
12
8
43
Mar
13
9
48.9
Jun
13
10
31.2
Sep
13
11
37.7
Dec
13
12
40.4
Mar
14
13
51.2
Jun
14
14
31.9
Sep
14
15
41
Dec
14
16
43.8
Mar
15
17
55.6
Jun
15
18
33.9
Sep
15
19
42.1
Dec
15
20
45.6
Mar
1
6
21
59.8
Jun
1
6
22
35.2
Sep
1
6
23
44.3
Dec
1
6
24
47.9
1.
Use
Exponential
Smoothing
with w=0.6
to
predict average
stay (
nights
)
by
foreign
tourists
during
four (4) quarters of
201
7
.
2.
Assuming there is a trend in the da
ta, use
appropriate
s
moothing
technique
with
coefficients
w=0.6 and ν=0.2
,
to
predict the
average
stay (
nights
)
by
foreign
tourists
during
four (4) quarters
of
201
7
.
3.
Which of the above two models do you prefer?
W
hy
?
,.. use MAD goodness of test in answering
th
is question.
4
.
Which one the
assumption
(if any) is/
are required for using
Kruskal
Wallis
test?
I
. We assume that the samples drawn from the population are random.
II
. We also assume tha
t the cases of each group are independent.
III
. The measurement scale for should be at least ordinal.
A. I, II but not III
B. I, I
I
I but not II
C. I, II and III
D.
Kruskal
Wallis
is a distribution free statistics and
therefore
no assumption is requir
ed.
Questions
5
6
are based on the following data
.
S
uppose weights of
an
exotic
plant (lbs) a
re
different based on treatments (no
treatment, fertilizer, irrigation, or fertilizer and irrigation). Each
weight samples that determined by the treatments is independent and random
.
W
e
ight samples
are not normally distributed.
NO
Fert
Irrig
F
&I
0.15
1.34
0.23
2.03
0.02
0.14
0.04
0.27
0.16
0.02
0.34
0.92
0.37
0.08
0.16
1.07
0.22
0.08
0.05
2.38
0.
0
2
2.38
5
. T
est whether the
weights
of plants
are different under the
treatments.
6. What is your conclusion and why
.
7
8
. Six
restaurant
food
critics
were randomly assigned to
all
four
restaurant
s (A, B,
C, and D)
and
asked to rate them
o
n the scale of 0
100 (100 being the best)
Rater A B C D
1
70
61
82
74
2
77
75
88
76
3
76
67
90
80
4
80
63
96
76
5
84
66
92
84
6
78
68
98
86
Are
there any differences
among
the
restaurant
ratings? Please support your
conclusion
with
objective
facts
/statistics
.
9
. Which of the following nonparametric tests can be used for a paired difference experiment?
a. The Wilcoxon Signed Ranks test.
b. The Sign test.
c.
The
Kruskal
Wallis test
d
. Spearman’s Rank Correlation test
10. The following table provides
M
ath and
English
scores
on 10
stu
d
ents
.
The relationship may
not be linear. Use
appropriate
statistics
to investigate the possible
ass
ociation
between these
scores
Exam
Scores
English
56
75
45
71
61
64
58
80
76
61
Maths
66
70
40
60
65
56
59
77
67
63
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