The New York Times December 1, 2009, article In November, Car Sales Show Signs of Stability reported

The New York Times December 1, 2009, article €œIn November, Car Sales Show Signs of Stability€ reported that new vehicles were selling at a seasonally adjusted annualized rate of 11 million in November. This rate was much higher than the low rate of 9 million computed earlier in 2009. Yearly seasons are one of many factors that have affected these numbers. Consider the following monthly sales profit figures of randomly selected salespeople from across New York State.

Does the sample show sufficient evidence that seasons do have a significant effect on car sale profits? Use the 0.05 level of significance.
a. Solve using the p-value approach.
b. Solve using the classical approach.

Transcribed Image Text:

Monthly Car Sale Profits per Season Spring 2,600 1,300 **For remainder of data, logon at cengagebrain.com Fall Summer 11,400 14,100 9,000 10,400 Winter 8,000 8,200