Question

The shape of the distribution of the time required to get an oil change at a 20-minute oil-change facility is unknown. However, records indicate that the mean time is 21.4 minutes, and the standard deviation is 3.7 minutes. Complete parts (a) through (c). (a) To compute probabilities regarding the sample mean using the normal model, what size sample would be required? (b) What is the probability that a random sample of nequals35 oil changes results in a sample mean time less than 20 minutes? (c) Suppose the manager agrees to pay each employee a $50 bonus if they meet a certain goal. On a typical Saturday, the oil-change facility will perform 35 oil changes between 10 A.M. and 12 P.M. Treating this as a random sample, there would be a 10% chance of the mean oil-change time being at or below what value?

Answer #1

The shape of the distribution of the time required to get an oil
change at a 20-minute oil-change facility is unknown. However,
records indicate that the mean time is 21.4 minutes, and the
standard deviation is 4.2 minutes.
Suppose the manager agrees to pay each employee a $50 bonus if
they meet a certain goal. On a typical Saturday, the oil-change
facility will perform 45 oil changes between 10 A.M. and 12 P.M.
Treating this as a random sample, there...

The shape of the distribution of the time required to get an oil
change at a
20-minute oil-change facility is unknown. However, records
indicate that the mean time is 21.6 minutes and the standard
deviation is 4.7 minutes.
Complete parts ((c).
Suppose the manager agrees to pay each employee a $50 bonus if
they meet a certain goal. On a typical Saturday, the oil-change
facility will perform
45 oil changes between 10 A.M. and 12 P.M. Treating this as a...

The shape of the distribution of the time required to get an oil
change at a 15
-minute
oil-change facility is unknown. However, records indicate that
the mean time is 16.1 minutes, and the standard deviation is 4.2
minutes.
C) Suppose the manager agrees to pay each employee a $50 bonus
if they meet a certain goal. On a typical Saturday, the
oil-change facility will perform 40 oil changes between 10 A.M. and
12 P.M. Treating this as a random...

The shape of the distribution of the time required to get an oil
change at a 15-minute oil-change facility is unknown. However,
records indicate that the mean time is 16.5 minutes, and the
standard deviation is 4.3 minutes.
-Suppose the manager agrees to pay each employee a $50 bonus
if they meet a certain goal. On a typical Saturday, the
oil-change facility will perform 35 oil changes between 10 A.M. and
12 P.M. Treating this as a random sample, there...

The shape of the distribution of the time required to get an oil
change at a
1515 -minute
oil-change facility is unknown. However, records indicate that
the mean time is
16.6 minutes
and the standard deviation is
3.6 minutes
Complete parts (a) through (c) below.
What is the probability that a random sample of
nequals=35
oil changes results in a sample mean time less than
15
minutes?
Suppose the manager agrees to pay each employee a $50 bonus if
they...

The shape of the distribution of the time required to get an oil
change at a 10-minute oil-change facility is unknown. However,
records indicate that the mean time is 11.2 minutes and the the
standard deviation is 4.9 minutes. The sample size is greater than
or equal to 30. Please answer C below:
What is the probability that a random sample of n=35 oil changes
results in a sample mean time less than 10 minutes? The probability
is approximately 0.0735...

The shape of the distribution of the time is required to get an
oil change at a 15-minute oil-change facility is unknown. However,
records indicate that the mean time is 16.2 minutes, and the
standard deviation is 4.2 minutes. Complete parts (a) through
(c).
(a) To compute probabilities regarding the sample mean using the
normal model, what size sample would be required?
A. The sample size needs to be less than or equal to 30.
B. The sample size needs...

The shape of the distribution of the time required to get an oil
change at a 10 -minute oil-change facility is unknown. However,
records indicate that the meantime is 11.8 minutes , and the
standard deviation is 4.6 minutes.Complete parts (a) through (c)
below.
(a) To compute probabilities regarding the sample mean using the
normal model, what size sample would be required?
Choose the required sample size below.
A.
The sample size needs to be greater than 30.
B.
Any...

The shape of the distribution of the time required to get an oil
change facility is unknown. However, records indicate that the mean
time is 21.8 minutes, and the standard deviation is 4.9
minutes.
suppose the manager agrees to pay each employee a $50 bonus if
they meet a certain goal. On a typical Saturday the oil change
facility will perform 40 oil changes between 10 am and
12pm.Treating this as a random sample there would be a 10% chance...

The shape of the distribution of the time required to get an
oil change at a 20-minute oil-change facility is unknown.
However, records indicate that the mean time is 21.7 minutes, and
the standard deviation is 4.6 minutes.
(a) To compute probabilities regarding the sample mean using
the normal model, what size sample would be required?
(b) What is the probability that a random sample of nequals35
oil changes results in a sample mean time less than 20
minutes?

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