A consumer group claims that the mean minimum time it takes for a sedan to travel a quarter mile is greater than 14.7 seconds. A random sample of 22 sedans has a mean minimum time to travel a quarter mile of 15.3 seconds and a standard deviation of 2.11 seconds. At =0.05 is there enough evidence to support the consumergroup's claim? Complete parts(a) through(d) below. Assume the population is normally distributed.

(a) Identify the claim and state H0 and Ha.

H0:

sigma

p

p

mu

sigma squared

2

less than

<

greater than or equals

equals

=

less than or equals

greater than

>

not equals

nothing

Ha:

sigma squared

2

sigma

p

p

mu

less than or equals

not equals

greater than or equals

greater than

>

equals

=

less than

<

nothing

(Type integers or decimals. Do notround.)

The claim is the

alternative

null

hypothesis.