Let p1 represent the population proportion of U.S. Senate and Congress (House of

Representatives) democrats who are in favor of a new modest tax on "junk food". Let p2

represent the population proportion of U.S. Senate and Congress (House of Representative)

republicans who are in favor of a new modest tax on "junk food". Out of the 265 democratic

senators and congressman 106 of them are in favor of a "junk food" tax. Out of the 285

republican senators and congressman only 57 of them are in favor of a "junk food" tax. Find a

95 percent confidence interval for the difference between proportions l and 2.

A. (0.197 0.203)

B. (0.163 0.238)

C. (0.108 0.292)

D. (0.125 0.275)

Find a 99 percent confidence interval for the difference between means n1 = 49, n2 = 49,

x1 = 87, x 2 = 92, s12 = 13 and s22 = 15.

A. (-12.30 2.30)

B. (-6.47 -3.53)

C. (-6.94 -3.05)

D. (-5.57 -4.43)

Calculate the t statistic for testing equality of means where x1 = 8.2, x 2 = 11.3, s12 = 5.4, s22 = 5.2, n1= 6, n2 = 7. (Assume equal population variances) A. -2.42

B. -1.05

C. -2.63

D. -4.86

When we test H0: 1 2, HA: 1 > 2at a = .10, where x1 = 77.4, x2 = 72.2, s1 =

3.3, s2 = 2.1, n1 = 6, n2= 6, what is the estimated pooled variance?

A. 2.77

B. 6.38

C. 2.52

D. 7.65

Construct a 95 percent confidence interval for 1- 2, where x 1 = 34.36,x 2 =

26.45, s1 = 9, s2= 6, n1 = 10, n2 = 16. (Assume equal population variance)

A. (1.59 14.23)

B. (2.10 13.72)

C. (1.86 13.96)

D. (1.88 13.94)

When testing H0: 1 - 2 = 2, HA: 1 - 2> 2, where x1 = 522, x2 = 516, 12 =

28, 22 = 24, n1= 40, n2 = 30, at a = .01, what is the test statistic?

A. 4.91

B. 2.33

C. 3.27

D. 2.67