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Is there evidence that the population mean ODOMETER READING of 4-cylinder cars is greater than that of 6-cylinder cars? - Use a 9% level of

Is there evidence that the population mean ODOMETER READING of 4-cylinder cars is greater than that of 6-cylinder cars? - Use a 9% level of significance. Consider 2 cases and discuss your finding carefully:

[a] Assume that variances are equal.

[b] Assume that variances are NOT equal. How can you solve this question?

data in excel sheet:

/content/enforced/497111-deu_cqms210_p21_04/QMS210Group_111.csv

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