Suppose that a simple random sample of size ?=320 contains 168 successes. Calculate the margin of error, ? , needed to construct a 95% confidence interval for proportion of successes in the population, ? . You might find this table of ? ‑distributions or this list of software manuals useful. Find the sample proportion, ?̂ , the standard error estimate, SE, the positive critical value, ? , and the margin of error, ? . Give all answers precise to at least three decimal places. ?̂ p ^ = SE = ? z = ?= m =
Suppose that a simple random sample of size ?=320 contains 168 successes. Calculate the margin of...
Suppose that a simple random sample of size ?=325 selected from a population has ?=147 successes. Calculate the margin of error for a 95% confidence interval for the proportion of successes for the population, ? . Compute the sample proportion, ?̂, standard error estimate, SE, critical value, ?, and the margin of error, ?. Use a ?- distribution table to determine the critical value. Give all of your answers to three decimal places except give the critical value, ?, to...
Suppose that a simple random sample of size n = 400 selected from a population has x = 247 successes. Calculate the margin of error for a 95% confidence interval for the proportion of successes for the population, p. Compute the sample proportion, p, standard error estimate, SE, critical value, z, and the margin of error, m. Use a z-distribution table to determine the critical value. Give all of your answers to three decimal places except give the critical value,...
estion 3 of 5 > Atten Suppose that a simple random sample of size 400 selected from a population, p, has 257 successes. Calculate the has 257 successes. Calculate the margin of error for a 90% confidence interval for the proportion of successes for the population, p. Show the results from each intermediate step performed to calculate the margin of error. First., proportion, , and use the sample proportion to calculate the standard error estimate, SE. Then determine the critical...
The number of successes and the sample size are given for a simple random sample from a population. Use the one-proportion plus-four z-interval procedure to find the required confidence interval. n = 188, x = 157; 95% level 0.785 to 0.871 0.786 to 0.870 0.774 to 0.882 0.775 to 0.881
The number of successes and the sample size for a simple random sample from a population are given. a. Determine the sample proportion. b. Decide whether using the one-proportion z-interval procedure is appropriate. c. If appropriate, use the one-proportion z-interval procedure to find the confidence interval at the specified confidence level x-75, n-250, 95% level a. What is the sample proportion? b. Is the one-proportion z-interval procedure appropriate? OA. No, because x is less than 5. O B. Yes, because...
1. A sample size of n-20 is a simple random sample selected from a normally distributed population. Find the critical value ta2 corresponding to a 95% confidence level. 2.093 O 2.086 02.861 1.960 2. Assume you want to construct a 90% confidence interval from sample of a distributed population. The sample size is 37. Find the critical value to2 1.687 2.719 1.688 O1.645 3. You are constructing a 95% confidence interval of a sample space consisting of n = 40...
A random sample of 80 observations results in 50 successes. [You may find it useful to referen a. Construct the 95% confidence interval for the population proportion of successes. (Round int decimal places. Round "z" value and final answers to 3 decimal places.) Confidence interval b. Construct the 95% confidence interval for the population proportion of failures. (Round inter decimal places. Round "z" value and final answers to 3 decimal places.) Confidence interval to
A simple random sample of size nis drawn from a population that is normally distributed. The sample mean, X, is found to be 106, and the sample standard deviations, is found to be 9. (a) Construct a 95% confidence interval about if the sample size, n, is 26 (b) Construct a 95% confidence interval about if the sample size, n, is 13 (c) Construct a 90% confidence interval about if the sample size, n, is 26 (d) Should the confidence...
simple random sample of size n is drawn from a population that is normally distributed. The sample mean, X. is found to be 111, and the sample standard deviation is found to be 10. a) Construct a 95% confidence interval about if the sample size, n, is 28. b) Construct a 95% confidence interval about if the sample size, n, is 11 c) Construct a 90% confidence interval about if the sample size, n, is 28 ) Could we have...
Assume that a sample size is used to estimate a population proportion p. Find the margin of error E that corresponds to the following statistics and confidence level. Round the margin of error to 4 decimal places. 95% confidence, n = 9000, of which 35% are successes. Use a TI84 and show all of your work