Reference no: EM13361019
Section 1 (i.e. question1 - 6)are Statistics practice questions answers in a correct order and if possible copy all the graphs in excel. 611 # 5
1. The data from England reports that the mean daily number of shares traded on the Stock Exchange in 2003 was 1441 in million. Assume that the populationstandard deviation equals 500 million shares. Suppose that, in a random sample of 36 days from the present year, the mean daily number of shares traded equals 1.5billion. Let the confidence level be 95%.
2. Referring to question 1 above,
(a) How large a sample size (trading days) is needed to estimate the population mean number of shares traded per day to within 100 million with 95% confidence?
(b) How large a sample size (trading days) is needed to estimate the population mean number of shares traded per day to within 10 million with 95 confidence? How many years does this number of translate into?
3. A 2009 study reported in Economics magazine stated that fifth graded teachers scored mean of 3.4 (out of 7) points for "providing evaluative feedback to students on their work,"10 Assume that the sample size was 36 and the sample standard deviation was 1.5.
(a) Find tα/2 for a confidence interval with 90% confidence.
(b) Compute and interpret the margin of error E for a confidence interval with 90% confidence
(c) Construct and interpret a 90% confidence interval for the population mean point scored by fifth-grade teachers for providing evaluative feedback.
4. Select your own sample data set and construct a confidence interval (using either z values - whichever is appropriate) for the mean of a population.
5. In a Gallup Poll of 1005 randomly selected Europeansin March2007, 482 responded "Yes" to the question "Do you consider the amount of federal income tax you have to pay as too high?"
(a) If appropriate, find a 90% confidence interval for the population proportion of all Europeans who consider that the amount of federal income tax they pay is too high.
(b) If appropriate, find a 99% confidence interval for the population of all Europeanswho consider that the amount of federal income tax they pay is too high.
6. Find a survey of your own and create a couple confidence intervals for the population.
Section_2:- section_2.docx