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In: Statistics and Probability

In what follows use any of the following tests/procedures: Regression, multiple regressions, confidence intervals, one-sided t-test...

In what follows use any of the following tests/procedures: Regression, multiple regressions, confidence intervals, one-sided t-test or two-sided t-test. All the procedures should be done with 5% P-value or 95% confidence interval

Upload CARS data. SETUP: It is believed that Jaguars’ Highway mileage is above 20 mpg. Given the data your job is to confirm or disprove this belief. (CAREFULL: sort the data in order to extract the needed information).

5. What test/procedure did you perform?

  • a. One-sided t-test
  • b. Two-sided t-test
  • c. Regression
  • d. ​​Confidence interval

6. What is the P-value/margin of error?

  • a. 0.161902527
  • b. 1.443714665
  • c. 6.149555
  • d. ​​8.065421
  • e. ​​None of these

7. Statistical Interpretation

  • a. Since P-value is very small we are confident that the average mpg is above 20.
  • b. Since P-value is large we cannot claim that the averages are different.
  • c. Since P-value is very small we are confident that the slope of regression line is not zero.
  • d. ​​None of these.

8. Conclusion

  • a. Yes, I am confident that the above claim is correct.
  • b. No, we cannot claim that the above claim is correct.
  • Vehicle Name Hybrid SuggestedRetailPrice DealerCost EngineSize Cylinders Horsepower CityMPG HighwayMPG Weight WheelBase Length Width
    Jaguar S-Type 3.0 4dr 0 43895 40004 3 6 235 18 26 3777 115 192 72
    Jaguar S-Type 4.2 4dr 0 49995 45556 4.2 8 294 18 28 3874 115 192 72
    Jaguar S-Type R 4dr 0 63120 57499 4.2 8 390 17 24 4046 115 192 72
    Jaguar Vanden Plas 4dr 0 68995 62846 4.2 8 294 18 28 3803 119 200 73
    Jaguar X-Type 2.5 4dr 0 29995 27355 2.5 6 192 18 26 3428 107 184 70
    Jaguar X-Type 3.0 4dr 0 33995 30995 3 6 227 18 25 3516 107 184 70
    Jaguar XJ8 4dr 0 59995 54656 4.2 8 294 18 28 3803 119 200 73
    Jaguar XJR 4dr 0 74995 68306 4.2 8 390 17 24 3948 119 200 73

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Expert Solution

I hope I have made it clear, If you have any doubt please ask in Comment section.

orchestra answered 2 years ago
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