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Nonparamatric Statistics Sample Assignment

Questions: - How strong is the correlation between crude oil prices and prices of gasoline at the pump? In an effort to estimate this association, an oil company analyst gathered the data shown over a period of several months. She lets crude oil prices be represented by the market value of a barrel of West Texas intermediate crude and gasoline prices be the estimated average price of regular unleaded gasoline in a certain city. She computes a Spearman’s rank correlation for these data.

Curde Oil              Gasoline
$14.60                  $3.25
10.50                    3.26
12.30                    3.28
15.10                    3.26
18.35                    3.32
22.60                    3.44
28.90                    3.56
31.40                    3.60
26.75                    3.54

Solutions: -
Here, n = 9. When the analyst ranks the values within each group and computes the values of d and d², she obtains the following.
Curde Oil          Gasoline        d            d²
$14.60                  $3.25        +2            4
10.50                    3.26        -1.5       2.25
12.30                    3.28           -2            4
15.10                    3.26       +1.5      2.25
18.35                    3.32            0            0
22.60                    3.44            0            0
28.90                    3.56            0            0
31.40                    3.60            0            0
26.75                    3.54            0            0
_____________________∑d² = 12.5



A high positive correlation is computed between the price of a barrel of West Texas intermediate crude and a gallon of regular unleaded gasoline.

Other Sample Assignments in Statistics Homework Assignment :

Continious Distribution	Descrete Distributions
Descriptive Statistics	Nonparamatric Statistics
Probability	Sampling And Sampling Distribution
Statistical Inference Estimation For Single Popula	Simple Regression Analysis
Statistical Inference About 2 Population	Time Series Forcasting Index Number
Statistical Quality Control	Correlation
Index Number	Larger Sample Mean Proportions
Non Parametric Test	Probability Theory
Sampling Distribution	Simple and Multiple Linear Regression Analysis
Unvariate Analysis

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