The following table shows the average number of vehicles sold in the United States monthly (in millions) for the years 2001 through 2018. Data on all monthly vehicle sales for these years were obtained and the average number per month was calculated. Would it be appropriate to do a chi-square analysis of this data set to see if vehicle sales are distributed equally among the months of the year? If so, do the analysis. If not, explain why it would be inappropriate to do so.

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Month Avg Sales per Month (in millions) Jan 15.7 Feb 15.7 Mar 15.8 Apr 15.8 May 15.8 June 15.7 July 16.1 Aug 16.1 Sept 15.8 Oct 15.9 Nov 15.9 Dec 15.9