Compute the sample size needed to compute a 98% Confidence Interval for a mean. Use a desired margin of error E=1.1 and an estimated standard deviation of  𝜎 = 6.2.   To find the sample size round up the value obtained from this formula: 𝑛 = ( 𝜎 × 𝑧 𝛼 2 𝐸 ) 2 (Note: When computing the critical value   𝑧 𝛼 / 2   that is used in this formula, round it to two decimal places before you plug it into the formula) c07.p062.q002  简答题

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Compute the sample size needed to construct a 95% Confidence Interval for a proportion. Use a desired margin of error E=0.047. To find the sample size round up the value obtained from this formula:  𝑛 = 0.25 × ( 𝑧 𝛼 2 𝐸 ) 2   (Note: When computing the critical value 𝑧 𝛼 / 2 that is used in this formula, round it to two decimal places before you plug it into the formula) c07.p063.q002.r002  

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