{"product_id":"research-designs","title":"Research Designs","description":"Author Paul E. Spector provides a clear introduction to the principles of experimental and non-experimental design, including single group design, pre-test, post-test designs, and factorial designs. Spector also covers hierarchical designs, multivariate designs, the Solomon four group design, panel designs, and designs with concomitant variables.","brand":"SAGE Publications Inc","offers":[{"title":"Default Title","offer_id":54259512475992,"sku":"9780803917095","price":50.99,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0278\/1295\/4195\/files\/9780803917095.jpg?v=1777787114","url":"https:\/\/agendabookshop.com\/products\/research-designs","provider":"Agenda Bookshop","version":"1.0","type":"link"}