Question: please show work so I can understand reasoning for answer (a) The width increases In Exercises 5-8, find the critical value z, necessary to form

please show work so I can understand reasoning for answer

(a) The width increases In Exercises 5-8, find the critical value z, necessary to form a confidence interval at the given level of confidence. 5.c = 0.80 6. c = 0.85 (7) c = 0.75 8. c = 0.97

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