臨地実習生の質の確保のための看護系大学共用試験(CBT)の開発的研究 : CBT試験問題の作成とそのモニター試験結果の統計的分析を中心にして A Study on the Development of Computer Based Testing(CBT) for a Common Achievement Test for Nursing Colleges in Order to Maintain Students' Competency for Practical Nursing : With Emphasis on Item Creation and Statistical Analysis of Pilot Testing