某企业产量季度资料，如表1所示。要求：用长期趋势剔除法计算季节指数。表1 某企业产量季度资料

<br />用长期趋势剔除法求季节指数的过程，如表2所示。<br /><span style='text-align:center;display:block'>表2</span><br /><span style='text-align:center;display:block'><img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/35be457f-106d-471d-b47e-c2ead1408a8b.jpg" width="268" height="365" /></span><br /><span style='text-align:center;display:block'>表3</span><br /><span style='text-align:center;display:block'><img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/06c003f0-aa4e-4e61-8e27-839129bbe065.jpg" width="411" height="223" /></span>