20. (4 points) A random sample of senators and representatives following informa
ID: 3321746 • Letter: 2
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20. (4 points) A random sample of senators and representatives following information about party at in their home districts. uple of senators and representatives in Wasg mation about party affiliation and number of dollars spent on federal projects Row total 22 47 34 TITI Dollars spent on federal objects in home district Less than 5 to 10 More than Party 5 billion billion 10 billion Democratic 15 45 Republican 16 Column total 20 38 92 Suppose you want to test the claim that party affiliation does not affect the allocation of feder spending in home districts. How many degrees of freedom does the test have? (a) 90 (b) 5 (c) 2 (d) 4 (e) 91 21. (4 points) The mean amount of dissolved oxygen in a stream is reported to be at least 5 mg per liter, but an environmentalist believes it is less than 5 mg per liter. To test the hypotheses Ho: u 25 vs. Hy: uExplanation / Answer
20) df = (r-1)(c-1) = 2
21) 4.8 < 5
hence no error
c) is correct
22)
Sample X N Sample p
1 40 250 0.160000
2 85 250 0.340000
Difference = p (1) - p (2)
Estimate for difference: -0.18
95% CI for difference: (-0.254251, -0.105749)
Test for difference = 0 (vs 0): Z = -4.75 P-Value = 0.000
Fisher’s exact test: P-Value = 0.000
error = 0.038
option D) is correct
sqrt(p1*q1/n1 + p2*q2/n2)
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