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- Periodical Spider-Man Fortune Federation MadNumber 156 52 26 78% of Library 18.6% 6.2% 3.1% 7.0%One of the percentages in this table is incorrect. Which is it?a. 18.6% (Spider-Man)b. 6.2% (Soldier of Fortune)c. 3.1% (WWF)d. 7.0% (Mad)f there is no seasonal effect on people getting sick, we would expect equal numbers of people getting sick in each season (winter, spring, summer and fall). A student takes a census of students who took Marketing Research in 2019 and finds that of the 280 students who took Marketing Research in 2019, 75 were sick in winter, 65 were sick in spring, 68 were sick in summer and 72 were sick in fall. She wonders if the excess in the winter is an indication that sickness rates are not uniform throughout the year. What is an appropriate H1? a. The number of people getting sick is not equally distributed across the four seasons. b. The observed values equal the observed values. c. The number of people getting sick is equally distributed across the four seasons. d. The expected values equal the expected values.To determine whether talking to plants affects their health, a researcher conducts a study in which he talks to one group of five plants and does not talk to the second group of five plants. After two weeks, he records the number of blooms produced by each plant (the dependent measure of their health). The researcher finds that, on average, the five plants he talked to produced 4.3 blooms (SD = 2.2), while the five plants he did not talk to produced 3.2 blooms (SD = 2.0). (a) Perform an independent-samples t-test to determine whether talking to the plants significantly affected their health.
- For a football game in the National Football League, let y = difference between the number of points scored by the home team and the away team (so y > 0 if the home team wins). Let x bet the predicted difference according to the Las Vegas betting spread. For the 768 NFL games played between 2003 and 2006, output follows. Predictor Coefficient SE Coef T P Constant -0.4022 0.5233 -0.77 0.442 BP 1.0251 0.0824 12.44 0.000 (a) We wish to test the null hypothesis that the Las Vegas predictions are unbiased. This will correspond with ? = 0 and ? = b) Based on the results shown in the table, is there much evidence that the sample fit differs from the model ?y = ? + ?x, with values of alpha and beta above? Why?We test whether “cramming” for an exam is harmful to grades. Condition 1 crams for a pretend exam, but condition 2 does not. Each group has 31 participants. Below are the data: M1=43, SS1=1920, M2=48, SS2=2508 Please to calculate r2A biologist looked at the relationship between number of seeds a plant produces and the percent of those seeds that sprout. The results of the survey are shown below. Seeds Produced 63 62 43 43 58 59 67 61 Sprout Percent 55.1 62.4 64.1 74.1 63.6 66.3 51.9 64.7 r2r2 = (Round to two decimal places) Interpret r2r2 : Given any group of plants that all produce the same number of seeds, 54% of all of these plants will produce seeds with the same chance of sprouting. There is a 54% chance that the regression line will be a good predictor for the percent of seeds that sprout based on the number of seeds produced. There is a large variation in the percent of seeds that sprout, but if you only look at plants that produce a fixed number of seeds, this variation on average is reduced by 54%. 54% of all plants produce seeds whose chance of sprouting is the average chance of sprouting. The equation of the linear regression line is: ˆyy^ = + xx (Please show your answers to…
- Find the value of m, b, and A so that f fits the data.How profitable are different sectors of the stock market? One way to answer such a question is to examine profit as a percentage of stockholder equity. A random sample of 32 retail stocks was studied for x1, profit as a percentage of stockholder equity. The result was x1 = 13.2. A random sample of 33 utility (gas and electric) stocks was studied for x2, profit as a percentage of stockholder equity. The result was x2 = 10.0. Assume ?1 = 4.2 and ?2 = 2.6. Note: For degrees of freedom d.f. not in the Student's t table, use the closest d.f. that is smaller. In some cases, this choice will increase the P-value by a small amount or increase the length of the confidence interval, thereby making the answer slightly more "conservative." (a) Let ?1 represent the population mean profit as a percentage of stockholder equity for retail stocks, and let ?2 represent the population mean profit as a percentage of stockholder equity for utility stocks. Find a 95% confidence interval for ?1 − ?2.…nternet Audience At the end of a certain year, the four companies with the largest number of home Internet users in the United States were Microsoft, Time Warner, Yahoo, and Google, with a combined audience of 284 million users. Taking x to be the Microsoft audience in millions, y the Time Warner audience in millions, z the Yahoo audience in millions, and u the Google audience in millions, it was observed that z − u = 3(x − y) + 22 x + y = 44 + z + u and x − y + z − u = 46. How large was the audience of each of the four companies at the end of that year? MicrosoftTime WarnerYahooGoogle
- Do cigarette filters appear to be effective? A. No, because the relative frequency of the higher tar classes is greater for filtered cigarettes. B. No, because the relative frequencies for each are not substantially different. C. Yes, because the relative frequency of the higher tar classes is greater for nonfiltered cigarettes. D. This cannot be determined.find the mode for the given data x f 1 2 2 7 3 5 4 4 5 3 6 4 7 5 8 7 9 2 Group of answer choicesNote that TSS, SSB, and SSW are all measures of variation. a. True or false: SSB, SSW, and TSS are always nonnegative. b. True or false: SSB < TSS, always. c. True or false: SSW < TSS, always. d. True or false: SSB/TSS is always between 0 and 1. e. True or false: SSB/TSS + SSB/SSW = 1, always.
