Confidence interval questions.

Confidence interval questions.

1. Keri is the owner of a new restaurant in the downtown area of
her hometown. To continuously improve service, she would like to
know if completed dishes are being delivered to the customer’s
table within one minute of being completed by the chef. A random
sample of 75 completed dishes showed that 60 were delivered within
one minute of completion.Calculate the 90%, 95%, and 99% confidence interval for the true
population proportion. Interpret your response within the context
of the situation. Refer to Chapter 17, pp. 427-430 on calculating
confidence intervals.2. A random sample of 100 students attending a concert spent an
average of $142 on their tickets with a standard deviation of
$47.50.Calculate the 90%, 95%, and 99% confidence intervals for the
mean amount of money spent by all students attending the concert.
Interpret your response within the context of the situation. Refer
to Chapter 17, pp. 427-430 on calculating confidence intervals

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