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MAT10251 - Statistical Analysis Assignment - Southern Cross University, Australia

STATISTICAL ANALYSIS PROJECT - Factors influencing price of used cars: This project leads you through a statistical analysis of used car data.

Question 1 - Estimate the population mean price of two and three year old used cars of the make and model for sale in the state specified by your sample.

Answer - The descriptive statistics for the price of cars

 Price Mean 16173.21 Standard Error 650.6318 Median 17790 Mode 19990 Standard Deviation 6977.248 Sample Variance 48681993 Kurtosis -1.09773 Skewness -0.08654 Range 26000 Minimum 3999 Maximum 29999 Sum 1859919 Count 115

The mean price of two and three year old used cars is \$ 16173.21 with a standard deviation of \$ 650.63 and the median price of two and three year old used car is \$ 17790. The minimum and maximum price of two and three year old used car is \$ 3999 and \$29999 respectively. Going through the histogram, we see that the distribution of price of two and three year old used cars has longer tail towards the left side of the normal curve, indicating that the distribution is left skewed.

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Question 2 - Are more than 30% of used cars of the make and model for sale in the state specified by your sample white?

Answer - The frequency distribution of White car is given below

 White Frequency Percentage No 84 73.04% Yes 31 26.96% Total 115

Null Hypothesis: H0: P <= 0.3

That is, not more than 30% of used cars purchased are white cars

Alternate Hypothesis: Ha: P > 0.3

That is, more than 30% of used cars purchased are white cars

Level of Significance:

Let the level of significance be α = 0.05

Test Statistic

The z test statistic

The p - value of z test statistic is 0.7619.

Since the p - value of z test statistic is greater than 0.05, there is no sufficient evidence to reject the null hypothesis at 5% level of significance. Thus, there is no sufficient evidence to conclude that the proportion white car sales is greater than 30%.

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Question 3 - Is there a difference in the average price of cars, of the specified make and model for sale in the specified state, for sale privately and by a used car dealer?

Answer - Null Hypothesis: H0: µ1 = µ2

That is, the average price of cars do not differ significantly between private and dealer sale

Alternate Hypothesis: Ha: µ1 ≠ µ2

That is, the average price of cars differ significantly between private and dealer sale

Level of Significance:

Let the level of significance be α = 0.05

Test Statistic

The table given below shows the workings of t test statistic

t-Test: Two-Sample Assuming Equal Variances

 t-Test: Two-Sample Assuming Equal Variances Price - Private Price - Dealer Mean 14948.94 17148.80 Variance 44438800.38 50642116.39 Observations 51 64 Pooled Variance 47897286.29 Hypothesized Mean Difference 0 df 113 t Stat -1.6934 P(T<=t) one-tail 0.0466 t Critical one-tail 1.6585 P(T<=t) two-tail 0.0931 t Critical two-tail 1.9812

The value of t test statistic is - 1.6934 and its corresponding p - value is 0.0931. Here, we see that the p - value of t test statistic is greater than 0.05, indicating that the average price of cars do not differ significantly between private and dealer sale.

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Question 4 - Simple Linear Regression Model: - Calculating the least squares regression line, correlation coefficient and coefficient of determination. Interpreting the gradient and vertical intercept of the simple linear regression equation. Interpreting the correlation coefficient and coefficient of determination. Are these values consistent with your scatter plot?

Dependent Variable: Price

Independent Variable: Odometer (kms)

The regression output is given below

 SUMMARY OUTPUT Regression Statistics Multiple R 0.846666 R Square 0.716844 Adjusted R Square 0.714338 Standard Error 3729.153 Observations 115 ANOVA df SS MS F Significance F Regression 1 3978303334.09 3978303334.09 286.07 0.00 Residual 113 1571443822.90 13906582.50 Total 114 5549747156.99 Coefficients Standard Error t Stat P-value Lower 95% Upper 95% Intercept 23731.63 566.2416837 41.91077161 1.08E-70 22609.8 24853.45 Odometer (kms) -0.10397 0.006146971 -16.91370449 9.65E-33 -0.116146 -0.09179

The regression equation is

Price = 23731.63 - 0.104 * Odometer

The coefficient of determination is 0.717, indicating that 71.7% of the variation in price is explained by the regression model and the remaining 28.3% left unexplained.

The p - value of f test statistic to validate the model fit is 0.000 < 0.05, indicating that the estimated regression model is good fit in predicting price.

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Question 5 - Multiple Linear Regression Model: Calculating the multiple regression equation, multiple correlation coefficient, and coefficient of multiple determination. Interpreting the values of the multiple regression coefficients. Interpreting the values of the multiple correlation coefficient and coefficient of multiple determination. Compare these values with the corresponding values for the simple linear regression model. Then determine the best model to predict the price of a used car by: Using appropriate tests to determine which independent variables make a significant contribution to the regression model. Give or calculate the simple or multiple regression equation which best fits the data.

Independent Variable: Age, Odometer (kms) and Transmission

The multiple regression output is given below

 SUMMARY OUTPUT Regression Statistics Multiple R 0.91 R Square 0.84 Adjusted R Square 0.83 Standard Error 2857.33 Observations 115.00 ANOVA df SS MS F Significance F Regression 3.00 4643503522.54 1547834507.51 189.58 0.00 Residual 111.00 906243634.45 8164357.07 Total 114.00 5549747156.99 Coefficients Standard Error t Stat P-value Lower 95% Upper 95% Intercept 24106.70 636.73 37.86 0.00 22844.97 25368.43 Age -990.31 117.07 -8.46 0.00 -1222.30 -758.32 Odometer (kms) -0.04 0.01 -4.62 0.00 -0.06 -0.02 Transmission 1813.85 560.96 3.23 0.00 702.27 2925.43

The regression equation is

Price = 24106.7 - 990.31 * Age - 0.04 * Odometer + 1813.85 * Transmission

The coefficient of determination is 0.84, indicating that 84% of the variation in price is explained by the regression model and the remaining 16% left unexplained.

The p - value of f test statistic to validate the model fit is 0.000 < 0.05, indicating that the estimated regression model is good fit in predicting price.

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