Question

A CBS News poll conducted June 10 and 11, 2006, among a nationwide random sample of 651 adults, asked those adults about their party affiliation (Democrat, Republican or none) and their opinion of how the US economy was changing ("getting better," "getting worse" or "about the same"). The results are shown in the table below.

	better	same	worse
Republican	38	104	44
Democrat	12	87	137
none	21	90	118

Express your answers as a decimal and round to the nearest 0.001 (in other words, type 0.123, not 12.3% or 0.123456).

If we randomly select one of the adults who participated in this study, compute:

P(affiliated with neither party) =

P(worse) =

P(worse|affiliated with neither party) =

P(affiliated with neither party|worse) =

P(affiliated with neither party and worse) =

Answer 1

	better	same	worse	total
Republican	38	104	44	186
Democrat	12	87	137	236
none	21	90	118	229
total	71	281	299	651

1)

P(affiliated with neither party) = 229/651 =0.352

2)

P(worse) = 299/651 =0.459

3)

P(worse|affiliated with neither party) = 118/229 =0.515

4)

P(affiliated with neither party|worse) = 118/299 =0.395

5)

P(affiliated with neither party and worse) = 118/651 =0.181