A. A local politician was interested in determining whether income level affects
ID: 3229533 • Letter: A
Question
A. A local politician was interested in determining whether income level affects opinion regarding the government's bailout bill for easing the 2008 financial crisis on Wall Street. He surveyed a sample of his constituents and got the following results. The correct null hypothesis to be tested is
Opinion
Income Level
Favor
Oppose
>$200,000
38
29
$50,000 to $200,000
30
42
<$50,000
32
59
I. There is no relationship between income level and opinion.
II. There is a relationship between income level and opinion.
III. Opinion and income level are independent.
A) III only
B) II only
C) Both I and III
D) I only
E) Both II and III
B. A local politician was interested in determining whether income level affects opinion regarding the government's bailout bill for easing the 2008 financial crisis on Wall Street. He surveyed a sample of his constituents and got the following results. The expected number of favor opinion for $50,000 to $200,000 income level is:
Opinion
Income Level
Favor
Oppose
>$200,000
38
29
$50,000 to $200,000
30
42
<$50,000
32
59
45.382
40.696
31.304
39.565
29.130
Opinion
Income Level
Favor
Oppose
>$200,000
38
29
$50,000 to $200,000
30
42
<$50,000
32
59
Explanation / Answer
A)C) Both I and III
B) applying chi square analysis on above:
expected number of favor opinion for $50,000 to $200,000 income level is =31.304
Observed O favor oppose Total >200000 38 29 67 50000-200000 30 42 72 <50000 32 59 91 Total 100 130 230 Expected E=rowtotal*column total/grand total favor oppose Total >200000 29.130 37.870 67 50000-200000 31.304 40.696 72 <50000 39.565 51.435 91 Total 100 130 230 chi square =(O-E)^2/E favor oppose Total >200000 2.701 2.0774 4.778 50000-200000 0.054 0.042 0.096 <50000 1.447 1.113 2.559 Total 4.201 3.232 7.4334Related Questions
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