Suppose that three book publishers were interested in the number of fiction paperbacks adult consumers purchase per month. Each publisher conducted a survey. In the survey, each asked adult consumers the number of fiction paperbacks they had purchased the previous month. The results are below.
Publisher a
# of books
Freq.
Rel. Freq.
0
10
1
12
2
16
3
12
4
8
5
6
6
2
8
2
Publisher b
# of books
Freq.
Rel. Freq.
0
18
1
24
2
24
3
22
4
15
5
10
7
5
9
1
Publisher c
# of books
Freq.
Rel. Freq.
0-1
20
2-3
35
4-5
12
6-7
2
8-9
1
Find the relative frequencies for each survey. Write them in the charts.
Using either a graphing calculator, computer, or by hand, use the frequency column to construct a histogram for each publisher's survey. For Publishers A and B, make bar widths of 1. For Publisher C, make bar widths of 2.
In complete sentences, give two reasons why the graphs for Publishers A and B are not identical.
Would you have expected the graph for Publisher C to look like the other two graphs? Why or why not?
Make new histograms for Publisher A and Publisher B. This time, make bar widths of 2.
Now, compare the graph for Publisher C to the new graphs for Publishers A and B. Are the graphs more similar or more different? Explain your answer.
Often, cruise ships conduct all on-board transactions, with the exception of gambling, on a cashless basis. At the end of the cruise, guests pay one bill that covers all on-board transactions. Suppose that 60 single travelers and 70 couples were surveyed as to their on-board bills for a seven-day cruise from Los Angeles to the Mexican Riviera. Below is a summary of the bills for each group.
Singles
Amount($)
Frequency
Rel. Frequency
51-100
5
101-150
10
151-200
15
201-250
15
251-300
10
301-350
5
Couples
Amount($)
Frequency
Rel. Frequency
100-150
5
201-250
5
251-300
5
301-350
5
351-400
10
401-450
10
451-500
10
501-550
10
551-600
5
601-650
5
Fill in the relative frequency for each group.
Construct a histogram for the Singles group. Scale the x-axis by $50. widths. Use relative frequency on the y-axis.
Construct a histogram for the Couples group. Scale the x-axis by $50. Use relative frequency on the y-axis.
Compare the two graphs:
List two similarities between the graphs.
List two differences between the graphs.
Overall, are the graphs more similar or different?
Construct a new graph for the Couples by hand. Since each couple is paying for two individuals, instead of scaling the x-axis by $50, scale it by $100. Use relative frequency on the y-axis.
Compare the graph for the Singles with the new graph for the Couples:
List two similarities between the graphs.
Overall, are the graphs more similar or different?
By scaling the Couples graph differently, how did it change the way you compared it to the Singles?
Based on the graphs, do you think that individuals spend the same amount, more or less, as singles as they do person by person in a couple? Explain why in one or two complete sentences.
Refer to the following histograms and box plot. Determine which of the following are true and which are false. Explain your solution to each part in complete sentences.
The medians for all three graphs are the same.
We cannot determine if any of the means for the three graphs is different.
The standard deviation for (b) is larger than the standard deviation for (a).
We cannot determine if any of the third quartiles for the three graphs is different.
In this morden time nanotechnology used in many field .
1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc
2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc
3- Atomobile -MEMS, Coating on car etc.
and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change .
maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Source:
OpenStax, Collaborative statistics (custom online version modified by t. short). OpenStax CNX. Jul 15, 2013 Download for free at http://cnx.org/content/col11476/1.5
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