During the recen recovery the Great Recession of 20o7.2009, the econom families
ID: 3233572 • Letter: D
Question
During the recen recovery the Great Recession of 20o7.2009, the econom families has improved. However in 2011 the recovery was slow and it was uncertain lly changed on the national level. To situation for many as to how much income working families, a represe estimate the population parameter of the percent of low- tative simple random sample could be used to calculate a point estimate and write an appropriate sampling procedure that will enable a researcher to collect a imple random of size n 20 from the full list of jurisdictions outh sampling of the jurisdictions by using a random number generator, random number the full list of the the table included below, making lected sample of 20 in working families %LIWF) sure to include the corresponding percent of low-income information for each urisdiction selected MuWF jurisdiction %LIWF Jurisdiction 9. Use technology to calculate the sample mean and sample standard deviation of the percent of low-income working families for the selected 20 jurisdictions in your sample. Provide your mean and standard deviation and express in detail why it is unlikely that any two samples would produce the same results 10. A different sample of size n 20 produced a sample mean of 31.08% and a sample standard deviation of 5.48%. Use these values to calculate a 90% confidence interval (without the use of statistical technology) for the national mean percent of low-income working families. Please show all calculations and provide the upper and lower limits that make up the confidence interval. (Round the limits to two decimal places.) 11. Express an appropriate statistical interpretation of the 90% confidence interval included in the answer to number 10 12. In any of the 20-value samples selected, some jurisdictions may have a percent of low-income working families that is not included in the 90% confidence interval calculated above. If federal funds are available only for jurisdictions whose percent low-income working families falls within the reported confidence interval, explain whether an interval with a higher or lower confidence level would be more advantageous to the jurisdictions 13. If a lawmaker reports only research results that ensure that the jurisdiction he or she represents gets federal explain whether such an action would constitute a misuse of statistics. If the aid, action not a 111 suse Rev 10/2016Explanation / Answer
10.
One-Sample T
N Mean StDev SE Mean 90% CI
20 0.3108 0.0548 0.0123 (0.2896, 0.3320)
90% Confidence interval is 28.96%, 33.20%
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