. The null hypothesis Ho in a two-way table represents which of the following? A) There is no association between the row variable and the column variable. B) There is an association between the row variable and the column variable. C) None of the above
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- In a study of high school students at least 16 years of age, researchers obtained the survey results summarized in the table below (based on data from “Texting While Driving and Other Risk Motor Vehicle Behaviors Among U.S. High School Students” by O’Malley, Shults, and Eaton, Pediatrics, 131, No.6). Irregular Seat Belt Use? Yes No RT Texted While Driving 1737 2048 3785 Did not Text While Driving 1945 2775 4720 Column total 3682 4823 8505 State the null and alternative hypotheses. Null hypothesis: H0 Texting when driving is independent of irregular seat belt use. Alternative hypothesis: Texting when driving is dependent of irregular seat belt use. Assuming independence, what are the expected frequencies for each of these variables? E=(row total)(column total) (grand total) What is the value of the X2 statistic? X2=E(0-E)2…Cars and trucks We have data on the city and highwayfuel efficiency of 316 cars and 316 trucks.a) Would it be appropriate to use paired t methods tocompare the cars and the trucks?b) Would it be appropriate to use paired t methods tocompare the city and highway fuel efficiencies ofthese vehicles?c) A histogram of the differences (highway – city) isshown. Are the conditions for inference satisfied?A psychologist wants to test the influence of color on object recognition in 4-year olds. She recruits 25 children and shows them two sets of pictures of everyday objects (variable = picture type), has the children name them, and measures the time it takes (variable = reaction time). She shows the children a color set of pictures first and then shows them a black and white set of pictures. a) What is the independent variable? b) What is the dependent variable? c) What is the second independent variable? d) What is the second dependent variable? e) Is "picture type" a within-subjects or between-subjects variable? f) What scale of measurement is reaction time? g) What scale of measurement is picture type? h) The order of presentation of the picture sets is what kind of variable?
- I NEED THE ANSWER TO THE "NUMBER OF DUMMY VARIABLES" A manager of a local package delivery store believes that too many of the packages were damaged or lost. She extracts a sample of 75 packages with the following variables: the package number (Package), the status of the package (Status: Delivered, Damaged, or Lost), the delivery type (Delivery: Standard, Express, or Same day), and the size of the package (Size: S, M, L, and XL). A portion of the data is shown in the accompanying table. Package Status Delivery Size 1 Damaged Standard M 2 Lost Express L ⋮ ⋮ ⋮ ⋮ 75 Damaged Same day M a)Transform the Delivery variable into dummy variables. Use the most frequent category as the reference category. How many dummy variables should be created? Which category of Delivery is the reference category? Number of dummy variables: ???? Reference Category: Standard Package Status Delivery Size 1 Damaged Standard M 2 Lost Express L 3 Lost Standard S 4 Delivered…Need help with a) and b)The following table contains observed frequencies for a sample of 240. RowVariable Column Variable A B C P 20 30 20 Q 30 60 25 R 10 15 30 Test for independence of the row and column variables using ? = 0.05. 1) State the null and alternative hypotheses: A) H0: The column variable is independent of the row variable. Ha: The column variable is not independent of the row variable. B) H0: Variable P is not independent of variables Q and R. Ha: Variable P is independent of variables Q and R. C) H0: The column variable is not independent of the row variable. Ha: The column variable is independent of the row variable. D) H0: Variable P is independent of variables Q and R. Ha: Variable P is not independent of variables Q and R. 2)Find the value of the test statistic. (Round your answer to three decimal places.) Find the p-value. (Round your answer to four decimal places.) p-value = 3)State your conclusion: A) Do not reject H0. We cannot conclude that the column…
- Choose all of the following true statements. {7,"Albert R.", 7/2, True} is not a set because it contains mixed data types. {7,"Albert R.", T/2, True} is a set. {7,"Albert R.", T/2, True} is the same as {True, "Albert R.", 7, 7/2} O 14/2 e {7," Albert R.", 7/2, True} O T/3 € {7,"Albert R.", 7/2, True} O 2/3 ¢ Z ACB= Vx. [x E A → x E B where A, B are sets. 6. {3} € {5,7,3} The empty set is a subset of every set.7. Create a table displaying whether or not the game is an action video game and whether or not it is played on the Playstation platform. 8. Rows: Action Columns: Playstation No Yes All No 239 155 394 Yes 41 65 106 All 280 220 500 Cell Contents Count 9. What type of analysis would you do to investigate the relationship between these two variables? 10. What would the hypotheses be for the analysis in #8? 11. Perform the analysis in # 8. State the test statistic, p-value, and conclusion. Chi Squaro TortThe table below summarizes a data set regarding views on full-body scans and political affiliation. The differences in each political group may be due to chance. Complete the following computations under the null hypothesis of independence between an individual's party affiliation and his support of full-body scans. It may be useful to first add on an extra column for row totals before proceeding with the computations. -TT Party Affiliation Republican Democrat Independent Should 264 299 351 Answer Should not 38 55 77 Don't know/No answer 16 15 22 Total 318 369 450 How many Democrats would you expect to support the use of full-body scans? Round your answer to one decimal place.
- Two random samples were drawn from members of the U.S. Congress. One sample was taken from members who are Democrats and the other from members who are Republicans. For each sample, the number of dollars spent on federal projects in each congressperson's home district was recorded. Dollars Spent on Federal Projects in Home Districts Party Less than 5 Billion 5 to 10 Billion More than 10 billion Row Total Democratic 8 16 21 45 Republican 15 16 16 47 Column Total 23 32 37 92 State the null and alternate hypotheses. H0: Different proportion of Democrats and Republicans within each spending level.H1: Different proportion of Democrats and Republicans within each spending level. H0: Different proportion of Democrats and Republicans within each spending level.H1: Same proportion of Democrats and Republicans within each spending level. H0: Same proportion of Democrats and Republicans within each spending level.H1: Different proportion of Democrats and Republicans…Q7. A survey was conducted in which 100 males and, independently, 100 females were asked about their respective methods of transportation to work. Participants were asked whether they typically drive to work, use public transportation, or walk / bicycle. The results are given in the table below. Can the investigators conclude that males differ from females in their work commute tendencies? Show your work. Drive Public Transportation Walk or Bicycle 22 Females 71 7 Males 76 18 6 (a) Based on the assumption that female and male tendencies are alike, construct a table of expected frequencies. (b) Use a X² test to evaluate the assumption used in part a. Make sure you indicate which test you are using! (c) Interpret the result of part b in terms of the situation of the problem, without using any statistical language.Solve the following problem