Question

Waiting times (in minutes) of customers in a bank where all customers enter a single waiting line and a bank where customers wait in individual lines at three different teller windows are listed below. Find the mean and median for each of the two samples, then compare the two sets of results. Single Line 6.3 6.6 6.7 6.8 7.0 7.2 7.6 7.8 7.8 7.8 Individual Lines 4.0 5.3 5.8 6.2 6.4 7.8 7.8 8.7 9.5 10.1

The mean waiting time for customers in a single line is ........ minutes.

Answer #1

For single line,

The mean waiting time for customers is = minutes

To find median,

th observation in sorted data set is 7

th observation in sorted data set is 7.2

The median waiting time for customers in a single line is minutes

For individual lines,

The mean waiting time for customers is = minutes

To find median,

th observation in sorted data set is 6.4

th observation in sorted data set is 7.8

The median waiting time for customers in a single line is minutes

We have seen that mean and median for both samples are same.

The values listed below are waiting times (in minutes) of
customers at two different banks. At Bank A, customers enter a
single waiting line that feeds three teller windows. At Bank B,
customers may enter any one of three different lines that have
formed at three teller windows. Answer the following questions.
Bank A
6.3
6.6
6.7
6.8
7.1
7.3
7.5
7.9
7.9
7.9
Bank Upper B
4.1
5.4
5.7
6.2
6.7
7.8
7.8
8.4
9.3
10.0
Using Chi-Square critical...

The values listed below are waiting times (in minutes) of
customers at two different banks. At Bank A, customers enter a
single waiting line that feeds three teller windows. At Bank B,
customers may enter any one of three different lines that have
formed at three teller windows. Answer the following questions.
Bank A
6.4
6.6
6.7
6.8
7.1
7.3
7.6
7.9
7.9
7.9
Bank Upper BBank B
4.3
5.4
5.8
6.2
6.7
7.7
7.7
8.4
9.4
10.0
Construct a...

The values listed below are waiting times (in minutes) of
customers at two different banks. At bank A, customers enter a
single waiting line that feeds three teller windows. At bank B,
customers may enter any one of three different lines that have
formed at three teller windows. Answer the following questions.
a) Bank A: 6.5,
6.6, 6.7, 6.8,
7.1, 7.3, 7.4,
7.7, 7.7,
7.7
Construct a 95% confidence interval for the population standard
deviation σ at bank A. ____...

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minutes. The Standard Deviation for the TCF Bank wait time is
s = .476 minutes. The Standard Deviation for the US Bank
wait times is s = 82 minutes
Compare the two standard deviations and write a sentence
explaining what the difference in standard deviations means if you
are a customer waiting in line...

An important statistical measurement in service facilities (such
as restaurants and banks) is the variability in service times. As
an experiment, two bank tellers were observed, and the service
times for each of 100 customers were recorded. Do these data allow
us to infer at the 5% significance level that the variance in
service times differs between the two tellers? Estimate with 95%
confidence the ratio of variances of the two bank tellers. Teller 1
Teller 2 7.2 10.9 5.4...

The values listed below are waiting times (in minutes) of
customers at two different banks. At Bank A, customers enter a
single waiting line that feeds three teller windows. At Bank B,
customers may enter any one of three different lines that have
formed at three teller windows. Answer the following questions.
Bank A 6.46.4 6.66.6 6.76.7 6.86.8 7.17.1 7.27.2 7.57.5 7.77.7
7.77.7 7.77.7 Bank Upper BBank B 4.24.2 5.55.5 5.95.9 6.16.1 6.86.8
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Banks once had a separate customer waiting line for each teller
window. Numerous banks have now gone to a single waiting line that
feeds the teller windows as vacancies occur. For one bank a simple
random sample of wait time (in minutes) using the single waiting
line was taken and the results are below: 6.5 6.6 6.7 6.8 7.1 7.3
7.4 7.7 7.7 7.7 The mean wait time for multiple lines was 7.5
minutes and the known standard deviation was...

SHOW ALL WORK. DO NOT USE SOFTWARE TO GENERATE ANSWERS.
Calculate the R-chart and X-bar chart limits for the data given
below.
Day
A
B
C
D
1
7.2
8.4
7.9
4.9
2
5.6
8.7
3.3
4.2
3
5.5
7.3
3.2
6.0
4
4.4
8.0
5.4
7.4
5
9.7
4.6
4.8
5.8
6
8.3
8.9
9.1
6.2
7
4.7
6.6
5.3
5.8
8
8.8
5.5
8.4
6.9
9
5.7
4.7
4.1
4.6
10
3.7
4.0
3.0
5.2
11
2.6
3.9...

Use the data in Bank Dataset to answer this question.
Construct a 95% confidence interval for the mean increase in
deposits. Note that the population standard deviation σ is not
known in this case. Instead the sample standard deviation s should
be calculated from the sample and the t distribution should be
used.
2. What is the margin of error at the 95% confidence level?
Bank Dataset of Increase in deposits. Mean is 4. Sample size is
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4.3...

Consider the accompanying data on flexural strength (MPa) for
concrete beams of a certain type.
5.8
7.2
7.3
6.3
8.1
6.8
7.0
7.4
6.8
6.5
7.0
6.3
7.9
9.0
8.4
8.7
7.8
9.7
7.4
7.7
9.7
8.1
7.7
11.6
11.3
11.8
10.7
The data below give accompanying strength observations for
cylinders.
6.8
5.8
7.8
7.1
7.2
9.2
6.6
8.3
7.0
8.5
7.5
8.1
7.4
8.5
8.9
9.8
9.7
14.1
12.6
11.8
Prior to obtaining data, denote the beam strengths by...

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