For each confidence interval procedure, provide the confidence level. (Round the answers to the nearest percent.) (a) Sample proportion ± 1.645 ✕ standard error. % (b) Sample proportion ± 2 ✕ standard error. % (c) Sample proportion ± 2.33 ✕ standard error. % (d) Sample proportion ± 2.58 ✕ standard error. %

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