Central Tendency and Measures of Variat
Central Tendency and Measures of Variation
Task 1:
1.1 a.) Define Population: Population is a complete group or collection of items or people selected to be used for a statistical study
b.) Define Sample: Sample is a partial selection or part of the population for which the study uses for information gathering.
1.7 The Neilson study is an inferential study; the results contained on the study are not focused and generalized. The population is not defined and therefore inferences are needed to state the results of the data and may not follow the trends of the population that the data being stated about here.
1.14 a.) For the offshore drilling poll, the US Adults are the population used. b.) The data used here is descriptive of the data gathered in the poll
1.17 The Salk vaccine study was conducted s a designed experiment. This is due to the selected study population being inoculated with or without (placebo) the vaccine to study the results of the two group’s reactions and results
Task 2:
3.8 The family net worth in the Survey of Consumer Finances, the mean net worth of families in the United States was $448.2 thousand and the median net worth was $93.1 thousand. Which measure of center do you think is more appropriate?
A lot depends on what you are looking for here; the mean net worth is the true average worth across the sample. However, the median net takes the extremes out of the worth, meaning the very rich and the very poor are less impactful on the number, and you will get a better middle of the sample worth. For the sake of publishing reports to the public, the median net worth is the better data to use.
3.14 For the simple data set (4, 2, 0, 2, 2) find the measures of center.
(Note: n=total count or 5)
a.) mean = (4+2+0+2+2)/n = 10/2 = 5 b.) median = (4, 2, 0, 2, 2) = (4, 2, 2, 2, 0) ordered: then n+1/2= (5+1)/2=3: Third number in set is the median (4, 2, 2, 2, 0) = 2 c.) mode(s)= 2 ; this is the only value that is repeated
Task 1:
1.1 a.) Define Population: Population is a complete group or collection of items or people selected to be used for a statistical study
b.) Define Sample: Sample is a partial selection or part of the population for which the study uses for information gathering.
1.7 The Neilson study is an inferential study; the results contained on the study are not focused and generalized. The population is not defined and therefore inferences are needed to state the results of the data and may not follow the trends of the population that the data being stated about here.
1.14 a.) For the offshore drilling poll, the US Adults are the population used. b.) The data used here is descriptive of the data gathered in the poll
1.17 The Salk vaccine study was conducted s a designed experiment. This is due to the selected study population being inoculated with or without (placebo) the vaccine to study the results of the two group’s reactions and results
Task 2:
3.8 The family net worth in the Survey of Consumer Finances, the mean net worth of families in the United States was $448.2 thousand and the median net worth was $93.1 thousand. Which measure of center do you think is more appropriate?
A lot depends on what you are looking for here; the mean net worth is the true average worth across the sample. However, the median net takes the extremes out of the worth, meaning the very rich and the very poor are less impactful on the number, and you will get a better middle of the sample worth. For the sake of publishing reports to the public, the median net worth is the better data to use.
3.14 For the simple data set (4, 2, 0, 2, 2) find the measures of center.
(Note: n=total count or 5)
a.) mean = (4+2+0+2+2)/n = 10/2 = 5 b.) median = (4, 2, 0, 2, 2) = (4, 2, 2, 2, 0) ordered: then n+1/2= (5+1)/2=3: Third number in set is the median (4, 2, 2, 2, 0) = 2 c.) mode(s)= 2 ; this is the only value that is repeated