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23 - Section 6.2 Inference for a Mean Question 5 of21 1' 1 View Policies Current Attempt in Progress impact of Sample Size on Accuracy Compute the standard error for sample means from a population with mean ,u = 80 and standard deviation (5 = 35 for sample sizes ofn = 45,71 = 170, and n = 1000. Round your answers to two decimal places. Sample Size Standard Error eTextbook and Media Save for Later Attempts: 0 of 4 used -/1 View Policies Current Attempt in Progress is a t-Distribution Appropriate? A sample with size n = 10 has)? = 508.5, and s = 21.5. The dotplot for this sample is given below. 0000 000 O O O 500 51 0 520 530 540 550 560 570 Indicate whether or not it is appropriate to use the t-distribution. If it is appropriate, give the degrees of freedom for the tdistribution and give the estimated standard error. If it is not appropriate, enter 1 in both of the answer elds below. Enter the exact answer for the degrees of freedom and round your answer for the standard error to two decimal places. df = I standard error = n eTextbook and Media Save for Later Attempts: 0 of 4 used 23 - Section 6.2 Inference for a Mean Question 9 of 21 - /1 IE View Policies Current Attempt in Progress Use the t-distribution to find a confidence interval for a mean / given the relevant sample results. Give the best point estimate for /, the margin of error, and the confidence interval. Assume the results come from a random sample from a population that is approximately normally distributed. A 95% confidence interval for / using the sample results x = 10.2, s = 6.1, and n = 30 Round your answer for the point estimate to one decimal place, and your answers for the margin of error and the confidence interval to two decimal places. point estimate = margin of error = i The 95% confidence interval is to e Textbook and Media Save for Later Attempts: 0 of 4 used Submit Answer23 - Section 6.2 Inference for a Mean Question 10 of21 4'1 View Policies Current Attempt in Progress What sample size is needed to give a margin of error within i 3 in estimating a population mean with 90% condence, assuming a previous sample had S = 18. Round your answer up to the nearest integer. sample size = n eTextbook and Media Save for Later Attempts: 0 of 4 used