Chicken Delight claims that 90% of its orders are delivered within 10 minutes of

Question

Chicken Delight claims that 90% of its orders are delivered within 10 minutes of the time the order is placed. A sample of 100 orders revealed that 82 were delivered within the promised time. At the .10 significance level, can we conclude that less than 90% of the orders are delivered in less than 10 minutes?

a What is the Null Hypothesis?

Ho µ _____ _____

Ha µ _____ _____

b Hypothesis test being performed is? (Circle answer) Left tail test, Right tail test Two tail test

c Degrees of freedom, df for the test statistic t is?

df = ________

d Numerical value of the test statistic t is? (Show work)

t = ________

e Method of calculation (Circle answer) Table, Computer algorithm

Pvalue = _______

f Your Decision is? (Circle answer) Null Hypothesis, Alternate Hypothesis, Insufficient information to make decision

Explanation / Answer

a) H0 is Mean=10

HA is Mean<10

b) Left tail test

c) Df=100-1=9

t=

e)p-value=0.0077

f) ALternative Hypothesis is accepted

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