If we have already decided on the margin of error and confidence level for a confidence interval, then a population with a standard deviation of 30 will require a greater sample size than a population with a standard deviation of 20. t or f?

suppose a hypothesis test was performed with a level of significance of 0.05. then if the null hypothesis is actually true, then there is a 5% chance that the researcher will end up accepting the alternative hypothesis in error. t or f?

if we have already decided on the margin of error and confidence level for a confidence interval, then a population with a standard deviation of 30 will require a greater sample size than a population with a standard deviation of 20. t or f?

300 south tahoe residents and 200 north tahoe residents are to be asked how many times they hit the slopes last season. for this study, a hypothesis test for the difference between means using paired samples cannot be used, but a hypothesis test for the difference between means using independent samples can be used. t or f?