Difference in number of circuit cards bought by month

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Q1) Director of marketing resources from RLS inc a company which deals with production of high speed and very high capacity circuit cards utilized exclusively for high end computers collected following data on number of circuit cards bought by corporations by month. At.05 level of significance can director conclude that there is difference in the number of circuit cards bought by month? What is your conclusions and recommendations?

 Day Frequency April 82 May 96 June 112 July 158 August 168

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