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  简答题

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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  

In a manufacturing process, we are interested in measuring the average length of a certain type of bolt. Past data indicate that the population standard deviation is .25 inches. How many manufactured bolts should be sampled in order to make us 95 percent confident that the sample mean bolt length is within .02 inches of the true mean bolt length?

The sample size needed to estimate a population mean to within 2 units with 95% confidence when the population standard deviation equals 8 is:当总体标准差等于 8 时，以 95% 的置信度将总体均值估计在 2 个单位以内所需的样本量为：

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