advances in economics business and management research volume 163 proceedings of the international conference on strategic issues of economics business and education icosiebe 2020 developing learning material book of statistics ...
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...Advances in economics business and management research volume proceedings of the international conference on strategic issues education icosiebe developing learning material book statistics based statistical application spss task portfolio joko suharianto muhammad yusuf eko wahyu nugrahadi choms gary g t sibarani faculty economic universitas negeri medan corresponding author email djoko unimed ac id abstract this is a development to develop create textbook had signed improve students ability master both manually through employed method for validating product with ten stages are potency problem data collecting design validation revision small group trial first usage test second mass production s making only reach seventh step were analyzed using descriptive cochran q paired sample analysis result discussion showed that statistic was valid effective fit applicable criteria keywords introduction it can cause lack motivation has an impact their achievement role plan collect analyze especia...