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Choice of significance levels and two types of errors

There is no difference between Pie menus and traditional pop-up menus

Type I: extra work developing software and having people learn a new idiom for no benefit

Type II: use a less efficient (but already familiar) menu  

Case 1: Redesigning a traditional GUI interface

a Type II error is preferable to a Type I error , Why?

Case 2: Designing a digital mapping application where experts perform extremely frequent menu selections

a Type I error is preferable to a Type II error, Why?

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