Question

Certain states require your vehicle to be inspected for safety
on a yearly basis. Police randomly stop drivers from time to time
to ensure that the car's safety inspection is up to date. Last
year, an average of 10% of cars stopped were ticketed for having
expired stickers. The state then funded a marketing campaign to
increase awareness of the safety inspection requirement in hopes of
lowering the amount of tickets issued. Last month the police issued
tickets for expired inspections to 43 of 628 cars they stopped. Is
this evidence to suggest that the marketing campaign was effective?
Assume all conditions have been met. **Part 1 of 3**:
2 pts State the null and alternative hypotheses in symbols and
words. Use the editor! Assume conditions have been met.
**Part 2 of 3**: 6 pts Perform the appropriate
hypothesis test "by hand" using the equation editor. Assume an
alpha level of 0.05 for your test. Be sure to use the appropriate
probability notation. Then find the corresponding confidence
interval for the proportion of cars whose safety inspections have
expired. Use α=0.05. **Part 3 of 3**: 2 pts State your
conclusion making sure to site whether we reject or fail to reject
and what that means in context. Then support your conclusion with
the results from your confidence interval. Be sure to note whether
the hypothesized value falls in our interval and what that
means.

Answer #1

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