What is the minimal sample size needed for a 99% confidence interval to have a maximal margin of error of 0.06: if a preliminary estimate for p is 0.8? if there is no preliminary estimate for p?

Construct a 90​% confidence interval to estimate the population proportion with a sample proportion equal to 0.35 and a sample size equal to 120.   A 90​% confidence interval estimates that the population proportion is between a lower limit of ____?____and an upper limit of ____?____

Estimated Speed   Smashed into hit n = 16 n = 16 M = 40 M = 34 SS = 510 SS = 414  Use a one-tailed test with α = .01. Use the data to make a 99% confidence interval estimate of the mean difference in estimate speed between the “smashed into” group and the “hit” group The upper limit of the confidence interval is

If a school district takes a random sample of 55 Math SAT scores and finds that the average is 422, and knowing that the population standard deviation of Math SAT scores is intended to be 100. Find a 99% confidence interval for the mean math SAT score for this district.   ______ ≤ μ ≤ _______

What proportion of people living in Quebec believes in Quebec sovereignty? A random sample of n = 375 persons living in Quebec was recently taken, of which K, the number sampled who believe Quebec should be a sovereign nation, was observed to be K=157.(a) Find a 95% confidence interval for the proportion of all persons living in Quebec who believe that Quebec should be a sovereign nation.____________ ≤ μ ≤ ____________(b) Correctly complete the interpretation of the 95%:Based on: ____________  the percentage of: A. everyone living in Quebec that belive in sovereignty B. everyone sampled who live in Quebec that belive in sovereignty     is somewhere between ____________ % and ___________ %.

Determine the minimum sample size required when you want to be 90​% confident that the sample mean is within one unit of the population mean and σ=18.9.  Assume the population is normally distributed. A 90% confidence level requires a sample size of _____________.

Surgical complications: A medical researcher wants to construct a 99.8% confidence interval for the proportion of knee replacement surgeries that result in complications. Part: 0 / 2 Part 1 of 2 (a) An article in a medical journal suggested that approximately 5% of such operations result in complications. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.05? A sample of operations is needed to obtain a 99.8% confidence interval with a margin of error of 0.05 using the estimate 0.05 for p. X S Tab oter F