Question

Could you explain to how to find these answers in excel as well please? I am having a terrible time trying to get it to work correctly for me.

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 3.98 minutes, with a sample standard deviation of 0.9 minute. Complete parts (a) and (b) below.

: mu=

: mu not equals

Determine the test statistic:

Find the P-value= (Rounded to the nearest three decimal places)

State the Conclusion:

Because the sample size is 81, do you need to be concerned about the shape of the population distribution when conducting the t test in (a)? Explain. Choose the correct answer below.

A. No, because n is equal to 81, the sampling distribution of the t test is approximately normal. In general, the t test is appropriate for a large sample size.

B. Yes, because n is equal to 81, the sampling distribution of the t test cannot be determined. In general, the t test is only appropriate for a normally distributed sample.

C. Yes, because n is equal to 81, the sampling distribution of the t test cannot be determined. In general, the t test requires a larger sample size.

D. No, because n is equal to 81, the sampling distribution of the t test is approximately normal. In general, the t test is appropriate for this sample size unless the population is skewed.

Answer #1

H0: mu = 3.7

Ha: mu not equals 3.7

Test statistic,

t = (xbar - mu)/(s/sqrt(n))

t = (3.98 - 3.7)/(0.9/sqrt(81))

t = 2.8

This is two tailed test, p-value = 2*P(t > 2.8)

= 0.006

Excel formula to calculate p-value =2 * (1 - T.DIST

(2.8,80,TRUE))

As p-value < 0.05, reject H0

There are significant evidence to conclude that the mean waiting
time is different that 3.7

D. No, because n is equal to 81, the sampling distribution of the t test is approximately normal. In general, the t test is appropriate for this sample size unless the population is skewed.

You are the manager of a restaurant for a fast-food franchise.
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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...

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Last? month, the mean waiting time at the? drive-through window for
branches in your geographical? region, as measured from the time a
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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 3.9 minutes. You select a random sample of 64 orders.
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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
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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...

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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....

Bank A and Bank B have each developed an improved process for
serving customers. The waiting period from the moment a customer
enters until he or she reaches the counter needs to be shortened. A
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results (in minutes) are shown in the accompanying data table.
Complete parts (a) through (d)
Bank A Bank B
2.92 3.86
2.84 4.17
3.22 4.94
3.45 5.54
3.64 5.02
4.98 6.31
4.58 6.37...

Let x represent the dollar amount spent on supermarket impulse
buying in a 10-minute (unplanned) shopping interval. Based on a
certain article, the mean of the x distribution is about $12 and
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buying in a 10-minute (unplanned) shopping interval. Based on a
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theorem, what can you say about the probability distribution of x,
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buying in a 10-minute (unplanned) shopping interval. Based on a
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STA2023
MULTIPLE CHOICE. Choose the one alternative that best completes
the statement or answers the question.
Provide an appropriate response.
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