S.
the kleen-mor company believes its disinfectant
has a market share of 25%. it surveys n = 200
janitors and asks whether kleen-mor is their
regular brand of disinfectant, and 42 of them say
yes.
a) perform a formal test at the a = 0.05 level to
determine whether kleen-mor's market share
is 25%. be sure to state the hypotheses,
calculate the test statistic, calculate the
p-value, and state your conclusion.
b) kleen-mor hires a celebrity spokesperson and
runs a series of tv ads to promote itself.
afterwards, a new sample of 100 janitors
was taken and 37 of them said kleen-mor
is their regular brand of disinfectant. is
there any evidence that kleen-mor had
a different market share before vs. after
hiring the celebrity spokesperson? perform
a formal hypothesis test (a = 0.05) and be
sure to state the hypotheses, calculate the test
statistic, calculate the p-value, and state your
conclusion in context.