What influences the sample size? we examine the effect of different inputs on determining the sample size needed to obtain a specific margin of error when finding a confidence interval for a proportion. find the sample size needed to give, with 95% confidence, a margin of error within plus-or-minus 6% when estimating a proportion. first, find the sample size needed if we have no prior knowledge about the population proportion p. then find the sample size needed if we have reason to believe that p almost-equals 0.7. finally, find the sample size needed if we assume p almost-equals 0.8.

The null and alternate hypotheses are: h0: μ1 ≤ μ2 h1: μ1 > μ2 a random sample of 22 items from the first population showed a mean of 113 and a standard deviation of 12. a sample of 16 items for the second population showed a mean of 99 and a standard deviation of 6. use the 0.01 significant level. find the degrees of freedom for unequal variance test. (round down your answer to the nearest whole number.) state the decision rule for 0.010 significance level. (round your answer to 3 decimal places.) compute the value of the test statistic. (round your answer to 3 decimal places.) what is your decision regarding the null hypothesis? use the 0.01 significance level.