# I need help with all of them

### STUCK with your assignment? When is it due? Hire our professional essay experts who are available online 24/7 for an essay paper written to a high standard at a reasonable price.

Order a Similar Paper Order a Different Paper

I need help with all of them

I need help with all of them

Page 7 of 7 Homework Assignment 5 Stat 200 (Floyd Sirovy) Instructions: Be sure to record the final answer next to “Answer” and show all your calculation steps or assumptions under “Work.” You can type in your calculations, use the equation tool, or insert images of your handwritten calculations. The exercises are all taken from our eText, Statistics Using Technology, by Kathryn Kozak. For your own information, the number in bold and within parentheses after each problem is the number of the exercise from the book. For simplicity, I will refer to the problems by the problem number I assign them (#1, 2, etc). Remember to add your last and first name to the end of the file name and upload your answers here (e.g., FILENAME_LASTNAME.docx) before submitting. Problem Number Problem and Solution #1 (2 pts) According to the February 2008 Federal Trade Commission report on consumer fraud and identity theft, 23% of all complaints in 2007 were for identity theft. In that year, Alaska had 321 complaints of identity theft out of 1,432 consumer complaints (Consumer fraud and, 2008). (7.1.2) State the random variable, population parameter, and hypotheses. Answer: Random variable: complaints of identity theft Population parameter: Alaska’s population Hypothesis: HO P=0.23 HA P<0.23 321/1432= 0.224 or 22.4% Z=0.224-0.23/√0.23(1-0.23)/1432= -0.54 Work: #2 (2 pts) Using the info from Problem #1: State the type I and type II errors in this case. Discuss the consequences of each error type for this situation from the perspective of the state of Arizona. What is the appropriate alpha level to use? (7.1.6) Answer: a. b. Work: #3 (2 pts) Using the info from Problem #1: Does this data provide enough evidence to show that Alaska had a lower proportion of identity theft than 23%? Test at the 5% level. (7.2.4) Answer: Work: #4 (2 pts) In 2008, there were 507 children in Arizona out of 32,601 who were diagnosed with Autism Spectrum Disorder (ASD; Autism and developmental, 2008). Nationally 1 in 88 children are diagnosed with ASD (CDC features -, 2013). (7.2.6) Is there sufficient data to show that the incidence of ASD is more in Arizona than nationally? Test at the 1% level. Answer: Work: #5 (2 pts) The economic dynamism, which is the index of productive growth in dollars for countries that are designated by the World Bank as middle-income are in Table #7.3.8, below (SOCR data 2008, 2013). Countries that are considered high-income have a mean economic dynamism of 60.29. (7.3.6) Do the data show that the mean economic dynamism of middle-income countries is less than the mean for high-income countries? Test at the 5% level. Table #7.3.8: Economic Dynamism of Middle Income Countries 25.8057 37.4511 51.915 43.6952 47.8506 43.7178 58.0767 41.1648 38.0793 37.7251 39.6553 42.0265 48.6159 43.8555 49.1361 61.9281 41.9543 44.9346 46.0521 48.3652 43.6252 50.9866 59.1724 39.6282 33.6074 21.6643 Answer: Work: #6 (2 pts) Maintaining your balance may get harder as you grow older. A study was conducted to see how steady the elderly is on their feet. They had the subjects stand on a force platform and have them react to a noise. The force platform then measured how much they swayed forward and backward, and the data is in Table #7.3.10, below (Maintaining balance while, 2013). (7.3.8) Do the data show that the elderly sway more than the mean forward sway of younger people, which is 18.125 mm? Test at the 5% level. Table #7.3.10: Forward/backward Sway (in mm) of Elderly Subjects 19 30 20 19 29 25 21 24 50 Answer: Work: #7 (2 pts) Suppose you compute a confidence interval with a sample size of 100. What will happen to the confidence interval if the sample size decreases to 80? (8.1.4) Answer: Since a large sample size from a the representative sample will make the interval width narrow. Shrinking the sample size will cause the width of confidence to expand. Work: #8 (2 pts) In 2013, Gallup conducted a poll and found a 95% confidence interval of the proportion of Americans who believe it is the government’s responsibility for health care. Give the statistical interpretation. (8.1.8) Answer: To look at it there’s 95% chance that the intervals contain the population proportion, so if in 100 intervals, 95 will contain the true portion while 5% should not. Work: 100-95= 5% #9 (2 pts) In 2008, there were 507 children in Arizona out of 32,601 who were diagnosed with Autism Spectrum Disorder (ASD; Autism and developmental, 2008). Find the proportion of ASD in Arizona with a confidence level of 99%. (8.2.6) Answer: Work: #10 (2 pts) The economic dynamism, which is the index of productive growth in dollars for countries that are designated by the World Bank as middle-income are in Table #8.3.9, below (SOCR data 2008, 2013). Compute a 95% confidence interval for the mean economic dynamism of middle-income countries. (8.3.6) Table #8.3.9: Economic Dynamism ($) of Middle Income Countries 25.8057 37.4511 51.915 43.6952 47.8506 43.7178 58.0767 41.1648 38.0793 37.7251 39.6553 42.0265 48.6159 43.8555 49.1361 61.9281 41.9543 44.9346 46.0521 48.3652 43.6252 50.9866 59.1724 39.6282 33.6074 21.6643 Answer: Work:

### Everyone needs a little help with academic work from time to time. Hire the best essay writing professionals working for us today!

Get a 15% discount for your first order

Order a Similar Paper Order a Different Paper