Question 1173589
make a table such as the one shown below:
<pre>
            republican     democrat     none      total

better         38             12         21        71
same           104            87         90        281
worse          44             137        118       299
total          186            236        229       651
</pre>


p(worse) is the total number of adults who said worse divided by the total number of adults.
that would be 299 / 651 = .4592933948 = .459


p(worse given none) is the total number of adults who were not affiliated with any party and said worse, divided by the total number of adults who were not affiliated with any party.
that would be 118 / 229 = .5152838428 = .515


p(none given worse) is the total number of adults who said worse and were not affiliated with any party, divided by the total number of adults who said worse.
that would be 118 / 299 = .3946488294 = .395


p(none and worse) is the total number of adults who were not affiliated with any part and, at the same time, said worse, divided by the total number of adults.
that would be 118 / 651 = .1812596006 = .181


the formula for p(a given b) is equal to p(a and b) / p(b)


from the table, .....:


p(worse and none) = 118 / 651 = .1812596006
p(none) = 229 / 651 = .3517665131


formula for p(worse given none) would be:


p(worse given none) = p(worse and none) / p(none) = .1812596006 / .3517665131 = .5152838428 = .515


this agrees with what the table showed when you analyzed p(worse given none) as shown below:


p(worse given none) is the total number of adults who were not affiliated with any party and said worse, divided by the total number of adults who were not affiliated with any party.
that would be 118 / 229 = .5152838428 = .515


i'm reasonably sure these are all correct.
give it a go and let me know how you did.
if any of these are not correct, let me know and i'll look at them again.
theo