Question

Data shows the times for carrying out a blood test at Rivervalley Labs

Using Excel Plot a histogram of the data. What type of distribution does the data appear to follow?

Construct and interpret the 95% confidence interval for the population mean time for carrying out a blood test. Assume that the population standard deviation is unknown.

Times for blood tests (minutes)

2.5 |

4.9 |

3.6 |

4.3 |

1.9 |

3.4 |

3.2 |

4.0 |

3.1 |

3.6 |

3.9 |

4.4 |

3.9 |

3.1 |

2.7 |

3.5 |

3.6 |

3.7 |

4.9 |

3.6 |

3.8 |

3.6 |

2.5 |

4.0 |

3.6 |

4.0 |

3.2 |

3.5 |

2.6 |

3.7 |

4.9 |

4.0 |

4.2 |

2.6 |

4.4 |

3.5 |

4.8 |

5.0 |

3.5 |

3.2 |

3.6 |

2.6 |

3.1 |

5.0 |

2.0 |

4.3 |

5.0 |

3.9 |

3.5 |

5.3 |

3.5 |

4.0 |

4.1 |

3.7 |

4.5 |

3.7 |

2.8 |

3.4 |

2.8 |

2.5 |

2.9 |

2.4 |

5.0 |

3.0 |

4.1 |

3.6 |

3.8 |

3.2 |

4.3 |

3.2 |

3.8 |

4.1 |

1.7 |

4.3 |

4.7 |

3.2 |

3.1 |

3.6 |

2.1 |

3.4 |

2.1 |

3.4 |

3.3 |

3.8 |

2.6 |

2.5 |

3.0 |

4.3 |

3.8 |

3.4 |

1.9 |

3.0 |

4.5 |

4.0 |

4.6 |

4.6 |

3.9 |

1.7 |

3.9 |

4.3 |

Answer #1

Upper Limit | Frequency |

0.5 | 0 |

1 | 0 |

1.5 | 0 |

2 | 5 |

2.5 | 7 |

3 | 11 |

3.5 | 22 |

4 | 29 |

4.5 | 14 |

5 | 11 |

5.5 | 1 |

6 | 0 |

6.5 | 0 |

7 | 0 |

The nature of the histogram suggests that the distribution is bell-shaped and approximately symmetrical. So, a normal distribution assumption may be valid for this distribution.

-----------------------------------

Assume that the data is pasted on **Column A** of
an Excel worksheet.

The sample mean = AVERAGE(A:A) = 3.578

The sample SD = STDEV.S(A:A) = 0.812

Z = NORMSINV(1 - (0.05/2)) = 1.96

Confidence Interval: Sample mean +/- Z*sample SD/sqrt(N)

= 3.578 +/- 1.96*0.812/sqrt(100) = **[3.42,
3.74]**

Listed in the accompanying data table are student evaluation
ratings of courses and professors, where a rating of 5 is for
"excellent." Assume that each sample is a simple random sample
obtained from a population with a normal distribution.
a. Use the 93 course evaluations to construct a 98%
confidence interval estimate of the standard deviation of the
population from which the sample was obtained.
b. Repeat part (a) using the 93 professor
evaluations.
c. Compare the results from part...

Build a stem-and-leaf plot for these measurements
3.1
4.9
2.8
3.6
2.5
4.5
3.5
3.7
4.1
4.9
2.9
2.1
3.5
4.0
3.7
2.7
4.0
4.4
3.7
4.2
3.8
6.2
2.5
2.9
2.8
5.1
1.8
5.6
2.2
3.4
2.5
3.6
5.1
4.8
1.6
3.6
6.1
4.7
3.9
3.9
4.3
5.7
3.7
4.6
4.0
5.6
4.9
4.2
3.1
3.9
A. Describe the form of data distribution. Do you notice any
unusual results?
B. Use the stem-and-leaf plot to find the minimum
observation....

We wish to determine the impact of Specification Buying, X11, on
Satisfaction Level, X10. To do so we will split the Hatco data file
into two separate data sets based on the Specification Buying, X11.
This variable has two categories:
1=employs total value analysis approach, evaluating each
purchase separately;
0 = use of specification buying.
Sort the entire Hatco data set based on Specification Buying.
This will create two separate groups of records. Those records with
X11 = 0 and...

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
152 customers.
4.3...

–Construct a reasonable frequency distribution of High School
GPA (HSGPA)
–Construct a histogram
–Present the frequency distribution and histogram
There are a total of 188 HS student GPAs.
1.6, 2, 2.1, 2.1, 2.2, 2.2, 2.2, 2.4, 2.4, 2.5, 2.5, 2.5, 2.5,
2.5, 2.6, 2.7, 2.75, 2.75, 2.75, 2.75, 2.75, 2.8, 2.8, 2.8, 2.9,
2.9, 2.9, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3.1, 3.1, 3.1, 3.2, 3.2, 3.2,...

Consider the following data set.
4.6
3.3
3.6
3.8
3.4
3.8
4.4
4.7
3.7
3.4
4.4
4.3
4.0
3.8
4.4
4.5
3.5
4.1
4.3
3.9
3.5
3.4
3.8
3.9
1. Recall the proper memories to find the mean.
2. Recall the proper memories to find the standard deviation.
(Round your answer to four decimal places.)
3. Calculate the range.
4. The range is approximately how many standard deviations?
(Round your answer to one decimal place.)
The range is approximately ___...

L1
L2
L3
L4
L5
L6
4.7
72
4.5
2.1
21
9.9
3.2
77
5.8
1.3
16
11.3
5.1
65
3.7
2.8
10
11.4
4.7
85
4.9
1.5
10
9
3.0
68
4.3
1.0
11
10.1
3.4
83
4.7
8.2
9
8.2
4.4
73
5.8
1.9
13
8.9
3.5
79
3.2
9.5
12
9.9
4.5
72
3.0
3.2
11
10.5
5.8
81
5.1
1.3
29
8.6
3.7
79
3.6
4.4
10
7.8
4.9
91
4.3
3.8
14
10.8
5.4
69...

Provided in the date below a set of restoration times for 35
failed power transformers. The data were collected for recent
transformer failures by a fairly novice work crew. a. What is a 90%
confidence interval for mean restoration time? b. What is a 99%
confidence interval for mean restoration time? c. If the industry
standard for such a restoration is 2.7 hours, discuss how well the
work crew in this analysis performed.
2.2
1.7
2.4
2.5
2.9
4.4
5.1...

A researcher collects data showing average time spent (in
minutes) at the grocery self-checkout lane at a particular store.
Using a Excel, create a histogram and generate descriptive
statistics for the average time spent by the 30 individuals that is
shown below. Attach the printed output to your assignment.
2.3
2.4
2.5
2.9
3.0
3.0
3.1
3.1
3.1
3.1
3.4
3.6
3.8
4.1
4.1
4.1
4.2
4.3
4.5
4.9
5.0
5.1
5.2
5.2
5.2
6.0
6.3
6.6
6.7
7.5

Bobo's bad burgers fast food claims you will be in and out in 5
mins. To test this claim, time in mins from entering Bobo's to
receiving the order was secretly recorded. The results: 2.1 8 4.6
2.5 3.5 4.3 3.9 5 6.5 3.4 5.6 6.6 4.3 4.9 9.3 5.5 4.3 11.9 5.2 4.8
5.2 7.8 8 4.6 4 5.9 8.7 3.1 4.9 11.6 2.1 8 4.6 2.5 3.5 4.3 3.9 5
6.5 3.4 5.6 6.6 4.3 4.9 9.3 5.5...

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