Seven people were tested on three different levels of a new injection machines to assess for pain response. Is there any difference in the pain level based on machine level? Person Level 1 Level 2 Level 3 1 2 3 4 5 6 7 2 5 11 7 0 1 3 11 8 10 10 14 6 16 18 15 21 16 19 22 18 ΣX2 = 3497
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Seven people were tested on three different levels of a new injection machines to assess for pain response. Is there any difference in the pain level based on machine level?
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- The London Schoolof Economics and the Harvard BusinessSchool conducted astudy of how Chief Executive Officers (CEOs) spend their day. The study found that CEOs spend on average about 18 hours per week in meetings, not including conference calls, business meals, and public events (The Wall Street Journal,February 14, 2012). Shown below is the time spent per week in meetings (hours) for a sample of 25 CEOs.14151823151920131523232115202116151818191922232112a.What is the least amount of time spent per week on meetings? The highest?b.Use a class width of two hours to prepare a frequency distribution and a percent frequency distribution of the data.A sample of 77 individuals working at a particular office was selected and the noise level (dBA) experienced by each individual was determined, yielding the following data (“Acceptable Noise Levels for Construction Site Offices,” Building Serv. Engr. Research and Technology, 2009: 87–94). 55.3 55.3 55.3 55.9 55.9 55.9 55.9 56.1 56.1 56.1 56.1 56.1 56.1 56.8 56.8 57 57 57 57.8 57.8 57.8 57.9 57.9 57.9 58.8 58.8 58.8 59.8 59.8 59.8 62.2 62.2 63.8 63.8 63.8 63.9 63.9 63.9 64.7 64.7 64.7 65.1 65.1 65.1 65.3 65.3 65.3 65.3 67.4 67.4 67.4 67.4 68.7 68.7 68.7 68.7 69 70.4 70.4 71.2 71.2 71.2 73 73 73.1 73.1 74.6 74.6 74.6 74.6 79.3 79.3 79.3 79.3 83 83 83 Use various techniques discussed in Descriptive Statistics lectures including visualizations to organize, summarize, and describe the data.A researcher wanted to know if an individual’s reaction of the election was impacted by their political party and religious beliefs. Test to see if religious belief and political affiliation affects election reaction. Democrat Republican Independent Religious 10140714ΣX2 = 541 1117181816ΣX2 = 1314 2121121723ΣX2 = 1844 Non Religious 211310174ΣX2 = 1015 2420251825ΣX2 = 2550 2228292822ΣX2 = 3377
- A random survey of enrollment at 10 community colleges across the United States yielded the following figures: 2523; 1707; 5420; 2835; 1129; 5452; 2360; 1448; 2958; and 4110. What is the 99% Error Bound (EBM) of the population mean?A sample of 77 individuals working at a particular officewas selected and the noise level (dBA) experienced byeach individual was determined, yielding the followingdata (“Acceptable Noise Levels for Construction SiteOffices,” Building Serv. Engr. Research and Technology,2009: 87–94). 55.3 55.3 55.3 55.9 55.9 55.9 55.9 56.1 56.1 56.1 56.156.1 56.1 56.8 56.8 57.0 57.0 57.0 57.8 57.8 57.8 57.957.9 57.9 58.8 58.8 58.8 59.8 59.8 59.8 62.2 62.2 63.863.8 63.8 63.9 63.9 63.9 64.7 64.7 64.7 65.1 65.1 65.165.3 65.3 65.3 65.3 67.4 67.4 67.4 67.4 68.7 68.7 68.768.7 69.0 70.4 70.4 71.2 71.2 71.2 73.0 73.0 73.1 73.174.6 74.6 74.6 74.6 79.3 79.3 79.3 79.3 83.0 83.0 83.0Use various techniques discussed in this chapter toorganize, summarize, and describe the data.5) Nabisco, the maker of Chips Ahoy! Cookies claims that there are at least 1000 chocolate chips in each 18 ounce bag of Chips Ahoy! Cookies. A simple random sample of 42 bags of cookies yielded the following data on number of chocolate chips in 18 ounce bags of Chips Ahoy!. 1200 1219 1103 1213 1258 1325 1295 1247 1098 1185 1087 1377 1363 1121 1279 1269 1199 1244 1294 1356 1137 1545 1135 1143 1215 1402 1419 1166 1132 1514 1270 1345 1214 1154 1307 1293 1546 1228 1239 1440 1219 1191 a) Find a point estimate for the mean number of chocolate chips per bag for all bags of Chips Ahoy! Cookies. (Note: ) b) Determine a 95.44% confidence interval for the mean number of chocolate chips per bag for all bags of Chips Ahoy! Cookies. Assume c) How would you decide whether the number of chocolate chips are approximately…
- A paper in the Journal of Nervous and Mental Disorders reported the following data on the amount of dextroamphetamine excreted by a sample of children having organically related disorders and a sample of children with nonorganic disorders (dextroamphetamine is a drug commonly used to treat hyperkinetic children). Organic: 17.53, 20.60, 17.62, 28.93, 27.10 Nonorganic: 15.59, 14.76, 13.32, 12.45, 12.79 (Observations refer to percentage of recovery of the drug seven hours after its administration.) If we assume that the variances of the two groups of children are unequal, determine whether the true average percentages of recovery for the two conditions are equal at significance level 0.01The fuel economy sticker on a new SUVs window sticker indicates the owner can expect 16 mpg in city driving and 20 mpg highway driving and 18 mpg overall. Accurate gasoline records for one such vehicle were kept, and a random sample of mileage per tank of gasoline was collected: 17.617.718.122.017.019.418.917.421.019.218.319.120.716.719.418.218.417.117.415.817.918.016.317.517.320.419.121.018.119.019.618.916.818.217.619.118.016.820.917.917.720.318.619.016.519.418.618.617.318.7 Test whether the population average mpg is actually greater than 18 mpg using a 1% level of significance. State the null and alternate hypotheses. Would you perform a one-tailed or two-tailed test? Why? State the test statistic and p-value of your test. Round your values to four-decimal places. Explain your conclusion to reject or fail to reject the null hypothesis in terms of p and α. Interpret your conclusion in the context of this problem.A recent poll revealed the political affiliations of 237 Americans, along with the region of the country in which they reside. Democrat Independent Republican Northwest 14 12 20 Southeast 29 23 49 West 35 18 37 To test whether the region of residence and political affiliation were related, one of the pollsters computed a chi-square statistic, ?2=2.7245, with four degrees of freedom and set an alpha (?) level of 0.05. Determine the ?-value of the chi-square statistic in this test for independence and report it to at least three decimal places. You will need to use some kind of software (statistical package or calculator that does statistical computations) to get the ?-value that precisely. P =
- Do men and women select different breakfasts? The breakfasts ordered by randomly selected men and women at a popular breakfast place is shown in Table 11.55. Conduct a test for homogeneity at a 5% level of significance. French Toast Pancakes Waffles Omelettes Men 47 35 28 53 Women 65 59 55 60A simple random sample of front-seat occupants involved in car crashes is obtained. Among3000occupants not wearing seat belts,36were killed. Among 7697occupants wearing seat belts,18were killed. Use a0.05significance level to test the claim that seat belts are effective in reducing fatalities. Complete parts (a) through (c) below.A marketing firm wants to know if there is a difference in the best marketing strategy for new customers compared to returning customers. In order to determine the relationship between marketing strategy and customer type, the following information on number of sales generated is obtained for each group. Is there sufficient evidence at the 0.010.01 level of significance to conclude that an association exists between marketing strategy and customer type? Observed Sample of Customers Paid search Social Media Web retargeting Total New customer 167167 154154 140140 461461 Returning customer 146146 145145 164164 455455 Total 313313 299299 304304 916916 Copy Data Step 1 of 4 : Calculate the expected value for the number of sales generated by the web retargeting strategy for new customers. Round your answer to six decimal places.