Question

1).a).

[ using normal table]

b).

[ using normal table]

c).let z be the 62nd percentile.

the score for 62nd percentile = 0.31

2).the given data are:-

margin of error (E) = 2% = 0.02

proportion (p) = 0.12

z critical value for 92% confidence level, both tailed test be:-

[ in excel type =NORMSINV(0.96)]

the needed sample size be:-

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