Question

task

State the most appropriate null and alternative
hypothesis for each of the following experiments
or observational studies:
a. A test of whether cigarette smoking causes
lung cancer
b. An experiment to test whether mean herbivore
damage to a genetically modified crop
plant differs from that in the related unmodified
crop
c. A test of whether industrial effluents from a
factory into the Mississippi River are affecting
fish densities downstream
d. A test of whether providing municipal safeinjection
sites for drug addicts influences
the rate of HIV transmission

Answer 1

a)

Ho: cigarette smoking do not causes
lung cancer

H1: cigarette smoking causes
lung cancer

b)

Ho:  mean herbivore
damage to a genetically modified crop
plant do not differs from that in the related unmodified
crop

H1:  mean herbivore
damage to a genetically modified crop
plant differs from that in the related unmodified
crop

c)

Ho:  industrial effluents from a
factory into the Mississippi River are not affecting
fish densities downstream

H1:  industrial effluents from a
factory into the Mississippi River are affecting
fish densities downstream

d)

Ho:  providing municipal safeinjection
sites for drug addicts do not influences
the rate of HIV transmission

H1:  providing municipal safeinjection
sites for drug addicts influences
the rate of HIV transmission