Question

28. You are the manager of a restaurant for a fast-food franchise. Last month, the mean waiting time at the drive-through window for branches in your geographical region, as measured from the time a customer places an order until the time the customer receives the order, was 3.7 minutes. You select a random sample of 81 orders. The sample mean waiting time is 3.86 minutes, with a sample standard deviation of 0.9 minute. Complete parts (a) and (b) below.

a. At the 0.05 level of significance, is there evidence that the population mean waiting time is different from 3.7 minutes? State the null and alternative hypotheses.

Determine the test statistic.

Find the p-value.

State the conclusion.

34. A survey of nonprofit organizations showed that online fundraising increased in the past year. Based on a random sample of 60 nonprofit organizations, the mean one-time gift donation in the past year was $75 with a standard deviation of $11.

If you test the null hypothesis at the 0.05 level of significance, is there evidence that the mean one-time gift donation is greater than $70? |

State the null and alternative hypotheses.

Find the test statistic.

Find the p-value for this hypothesis test.

What is the conclusion for this test?

Answer #1

28. You are the manager of a restaurant for a fast-food
franchise. Last month, the mean waiting time at the drive-through
window for branches in your geographical region, as measured from
the time a customer places an order until the time the customer
receives the order, was 3.8 minutes. You select a random sample of
81 orders. The sample mean waiting time is 3.99 minutes, with a
sample standard deviation of 0.9 minute.
At the 0.10 level of significance, is...

You are the manager of a restaurant for a fast-food franchise.
Last month, the mean waiting time at the drive-through window for
branches in your geographical region, as measured from the time a
customer places an order until the time the customer receives the
order, was 3.7 minutes. You select a random sample of 81 orders.
The sample mean waiting time is 3.41 minutes, with a sample
standard deviation of 0.9 minute. At the 0.01 level of
significance, is there...

You are the manager of a restaurant for a fast-food franchise.
Last month, the mean waiting time at the drive-through window for
branches in your geographical region, as measured from the time a
customer places an order until the time the customer receives the
order, was 3.9 minutes. You select a random sample of 81 orders.
The sample mean waiting time is 4.12 minutes, with a sample
standard deviation of 0.9 minute. Complete parts (a) and (b)
below.
A. At...

You are the manager of a restaurant for a fast-food franchise.
Last month, the mean waiting time at the drive-through window for
branches in your geographical region, as measured from the time a
customer places an order until the time the customer receives the
order, was 3.9 minutes. You select a random sample of 64 orders.
The sample mean waiting time is 3.67 minutes, with a sample
standard deviation of 0.8 minute. Complete parts (a) and (b)
below.
a. At...

You are the manager of a restaurant for a? fast-food franchise.
Last? month, the mean waiting time at the? drive-through window for
branches in your geographical? region, as measured from the time a
customer places an order until the time the customer receives the?
order, was 3.8 minutes. You select a random sample of 81 orders.
The sample mean waiting time is 3.55 ?minutes, with a sample
standard deviation of 0.9 minute. Complete parts? (a) and? (b)
below. a. At...

You are the manager of a restaurant for a fast-food franchise.
Last month, the mean waiting time at the drive-through window for
branches in your geographical region, as measured from the time a
customer places an order until the time the customer receives the
order, was
3.7 minutes. You select a random sample of 64 orders. The sample
mean waiting time is 3.41 minutes, with a sample standard
deviation of 0.8 minute.
Find the p-value.
p-value= ( )
(Round to...

A survey of nonprofit organizations showed that online
fundraising increased in the past year. Based on a random sample of
55 nonprofit organizations, the mean one-time gift donation in
the past year was $75, with a standard deviation of $20.
a.
If you test the null hypothesis at the 0.01
level of significance, is there evidence that the mean one-time
gift donation is greater than $70?
b.
Interpret the meaning of the p-value in this problem.

1. You are the manager of a fast-food restaurant. The business
problem is to determine whether the population mean waiting time to
place an order has changed in the past month from its previous
population mean value of 4.5 minute. From the past experience, you
can assume that the population is normally distributed, with a
population standard deviation of 1.2 minutes. You select a sample
of 25 orders during a one-hour period. The sample mean is 5.1
minutes.
Determine whether...

A local hardware store claims that the mean waiting time in line
is less than 3.7 minutes. A random sample of 20 customers has a
mean of 3.5 minutes with a standard deviation of 0.8 minute. If α =
0.05, test the bank's claim.
Null:
Alternative:
T=
p-Value=
Choose one: Reject or Fail to Reject
Conclusion in Context:

4. A bank manager has developed a new system to reduce the time
customers spend waiting for teller service during peak hours. The
manager hopes that the new system will reduce waiting times from
the current 9 to 10 minutes to less than 6 minutes. a. Set up the
null and alternative hypotheses needed if we wish to attempt to
provide evidence supporting the claim that the mean waiting time is
shorter than six minutes. b. The mean and the...

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