11217 .I '5' E} G myopenmath.com my'OpenMoih E Home > STT 2640 Online SPRING 2022 D TERM > Assessment Task 2: Homework 4A Score: 1/20 1/20 answered Progress saved Done (a) W' 0 Question 14 v E 0/1 pt '0 3 8 99 G) Details 8.2 Margin of Error for Mean u with 0 Unknown (t- table) Assume that a sample is used to estimate a population mean ,u,. Find the margin of error that corresponds to a sample of size 8 with a mean of 80.8 and a standard deviation of 8.9 at a confidence level of 99%. Report the margin of error accurate to one decimal place because the sample statistics are presented with this accuracy. kg Do not round until the very end. Question Help: [a Read 1 [a Read 2 8 Message instructor Submit Question 11217 .I '5' E} B myopenmath.com my'OpenMoih E Home > STT 2640 Online SPRING 2022 D TERM > Assessment Task 2: Homework 4A Score: 1/20 1/20 answered Progress saved Done (a) 15' 0 Question 13 v E 0/1 pt '0 3 8 99 G) Details 8.2 Margin of Error for Mean u with 0 Unknown (t- table) In a survey, 17 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $41 and standard deviation of $9. Find the margin of error at a 80% confidence level. Give your answer to two decimal places. km Question Help: E] Read 1 F5"! Read 2 8 Message instructor Submit Question 11217 .I '5' E} B myopenmath.com ' QUESEIUII 8 V K 2 B 0/1 pt '0 3 8 99 (D Details 8.1 Confidence Interval for Mean u with 0 Known (Z- table) You measure 26 textbooks' weights, and find they have a mean weight of 65 ounces. Assume the population standard deviation is 2.2 ounces. Based on this, construct a 90% confidence interval for the true population mean textbook weight. Give your answers as decimals, to two places Question Help: Q Read 1 Q Read 2 Q Read 3 8 Message instructor Submit Question 11217 .I '5' E} B myopenmath.com Progress saved Done (a) W' 0 Question 10 v E 0/1 pt '0 3 8 99 G) Details 8.2 Critical Value for Mean u with 0 Unknown (t- table) You intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution. Your sample size is 15. a.) The degrees of freedom d f = [j b.) Use the t-table on page 4 to find the critical value tc that corresponds to a confidence level of 99%. tc = C] (Use 4 decimal places) Question Help: F5\"! Read 1 F5\"! Read 2 8 Message instructor Submit Question 11217 .I '5' E} B myopenmath.com my'OpenMoih E Home > STT 2640 Online SPRING 2022 D TERM > Assessment Task 2: Homework 4A Score: 1/20 1/20 answered Progress saved Done (a) 15' 0 Question 12 v E 0/1 pt '0 3 8 99 G) Details 8.2 Margin of Error for Mean u with 0 Unknown (t- table) If n = 19, :E = 47, and s = 9, find the margin of error at a 95% confidence level Give your answer to two decimal places. E=l:J Question Help: E] Read 1 F5"! Read 2 8 Message instructor Submit Question 11217 .I '5' E} G myopenmath.com 0 Question 9 v E 0/1 pt '0 3 8 99 G) Details 8.1 Minimum Sample Size for Mean u with 0 Known (Z-table) You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately a = 60.7. You would like to be 99% confident that your estimate is within 0.1 of the true population mean. How large of a sample size is required? Round up to the next whole number. Question Help: [3 Read 1 [3 Read 2 8 Message instructor Submit