SOLUTION: In a study of the accuracy of fast food​ drive-through orders, one restaurant had 30 orders that were not accurate among 394 orders observed. Use a 0.10 significance level to
Algebra.Com
Question 1130703: In a study of the accuracy of fast food drive-through orders, one restaurant had 30 orders that were not accurate among 394 orders observed. Use a 0.10 significance level to test the claim that the rate of inaccurate orders is equal to 10%. Does the accuracy rate appear to be acceptable?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
Ho:rate is 10%
Ha: rate is not equal to 10%
alpha=0.10
test statistic is a one sample proportion z, where z=(phat-p)/sqrt((p*(1-p)/n))
critical value |z|>1.645
p hat is 0.076
z=(p hat-p)/sqrt(p*(1-p)/n)
=-.024/sqrt (.1*.9/394)=-.024/0.0151
=-1.59 o-value 0.11
This is not in the critical region. Fail to reject Ho; there is insufficient evidence to say the accuracy rate is not 10%. Note, the wording of the question uses "acceptable" without defining what it is. Does the accuracy rate appear to be fewer than ten per cent? would have been a clearer question.
RELATED QUESTIONS
In a study of the accuracy of fast food drive-through orders, one restaurant had 31... (answered by CPhill)
In a study of the accuracy of fast food drive-through orders, one restaurant had 3636... (answered by Boreal)
In a study of the accuracy of fast food drive-through orders, one restaurant had 31... (answered by CPhill)
I am having trouble getting to the point of a final answer. I am able to solve the Margin (answered by rothauserc)
In a study of the accuracy of fast food drive-through orders, Restaurant A had 284... (answered by jim_thompson5910)
Use the data in the following table, which lists drive-thru order accuracy at... (answered by ikleyn)
A local fast-food restaurant has determined that 10% of drive-thru orders are filled... (answered by edjones)
Which type of fast‑food chain fills orders most accurately at the drive‑thru window?... (answered by Boreal)
The delivery times for all food orders at a fast-food restaurant during the lunch hour... (answered by ikleyn)