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I Dont Know Essay

623 words - 3 pages

Task 1:
1.1 Define the following terms:
A. Population – The collection of all individuals or items under consideration in a statistical study.
B. Sample- That part of the population from which information is obtained
(pg. 4)
1.7 Descriptive or inferential
TV Viewing Times. The Nielsen Company collect sand publishes information on the television viewing habits of Americans. Data from a sample of Americans yielded the following estimates of average TV viewing time per month for all Americans 2 years old and older. The times are in hours and minutes (NA, not avail- able). [SOURCE: Nielsen’s Three Screen Report, May 2008]
This is an example of a descriptive form of data, because of the summary of the number of Americans 2 years old and older watching TV.

1.14 Offshore Drilling. A CNN/Opinion Research Corporation poll of more than 500 U.S ...view middle of the document...

In the 1940s and early 1950s, the public was greatly concerned about polio. In an attempt to prevent this disease, Jonas Salk of the University of Pittsburgh developed a polio vaccine. In a test of the vaccine’s efficacy, involving nearly 2 million grade-school children, half of the children received the Salk vaccine; the other half received a placebo, in this case an injection of salt dissolved in water. Neither the children nor the doctors performing the diagnoses knew which children belonged to which group, but an evaluation center did. The center found that the incidence of polio was far less among the children in- occulated with the Salk vaccine. From that information, the re- searchers concluded that the vaccine would be effective in pre- venting polio for all U.S. school children; consequently, it was made available for general use.

Experimental, because of the placebo. One group gets the vaccine and the other group gets the placebo. The variable which is changed in one group makes it an experiment.
Task 2:
I think that the mean would be more appropriate since there is a huge difference gap between the mean ($448.2 thousand) and the median (93.1 thousand), The information provided is just a sample of the population.

a. Mean
b. Median
0,2,2,2,4 = 2
c. Mode
The most common number is 2
a. Mean
b. Median
5.5,5.6,5.7,5.7,5.7,5.8,5.9 = 5.7
c. Mode
5.7 – most common number

Task 3: A simple random sample of Fair Isaac Corporation (FICO) Credit rating scores is listed below:
* Find Range, variance, and standard deviation
1. Range
(664, 693,698,714,751,753,779,789,802,818,834,836)
836 - 664 = 172
2. Variance:


3. Standard deviation:


* Yes, the FICO score is unusual because the standard deviation is 58 and that is more than 4 standard deviations away.

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