a. Select the hypotheses that can be used to test for equal proportions of defective components providede by the three suppliers. Ho : - Select your answer - H : - Select your answer - b. Conduct the hypothesis test with a .05 level of significance. What is the p-value? The p-value is - Select your answer - What is your conclusion? - Select your answer - c. Compute the sample proportion of late flights for each airline. What is the overall proportion of late flights for the three airlines? Round your answer to three decimal places. |(to 2 decimals) |(to 2 decimals) |(to 2 decimals) The overall proportion of late flights for the three airlines is P1 = P2 = P3 = oolt Mu JAouls

a. Select the hypotheses that can be used to test for equal proportions of defective components providede by the three suppliers. Ho : - Select your answer - H : - Select your answer - b. Conduct the hypothesis test with a .05 level of significance. What is the p-value? The p-value is - Select your answer - What is your conclusion? - Select your answer - c. Compute the sample proportion of late flights for each airline. What is the overall proportion of late flights for the three airlines? Round your answer to three decimal places. |(to 2 decimals) |(to 2 decimals) |(to 2 decimals) The overall proportion of late flights for the three airlines is P1 = P2 = P3 = oolt Mu JAouls

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Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section: Chapter Questions

Problem 13PT

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6. A research center claims that at least 30% of adults in a certain country think that their taxes will be audited. In a random sample of 1200 adults in that country in a recent year, 26% say they are concerned that their taxes will be audited. At α=0.10, is there enough evidence to reject the center's claim? Complete parts (a) through (e) below. Question content area bottom Part 1 (a) Identify the claim and state H0 and Ha. Identify the claim in this scenario. Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or a decimal. Do not round.) A. enter your response here % of adults in the country think that their taxes will be audited. B. The percentage of adults in the country who think that their taxes will be audited is not enter your response here %. C. At least 30 30% of adults in the country think that their taxes will be audited. Your answer is correct. D. Less than…
A school psychologist wants to test the effectiveness of a new method for teaching reading. She takes 500 first grade students from District 12 (all with the same teacher), and randomly assigns half of them to the traditional method and half of them to the new method for teaching reading. The students are not told which teaching method they are being taught with. At the end of the year, she obtains all scores on a reading achievement test, and looks for any differences between the two groups. f. Is double-blinding possible in this experiment? Why or why notg. g. If the school psychologist wanted to allow more districts to participate in the study, how could the study be redesigned? Draw a diagram representing the design, and include four districts in your design. h. If the school psychologist wanted to examine whether the new teaching method improved reading scores, how could the study be redesigned? Explain.
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An airline’s data indicate that 50 percent of people who begin the online process of booking a flight never complete the process and pay for the flight. To reduce this percentage, the airline is considering changing its website so that the entire booking process, including flight and seat selection and payment, can be done on two simple pages rather than the current four pages. A random sample of 300 customers who begin the booking process are exposed to the new system, and 117 of them do not complete the process. Formulate the null and alterative hypotheses needed to attempt to provide evidence that the new system has reduced the non-completion percentage. Use the critical value approach to test the hypotheses by setting α equal to 0.10, 0.05, 0.01 and 0.001. Use the p-value approach to test the hypotheses by setting α equal to 0.10, 0.05, 0.01 and 0.001.
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Write a note on Interaction emerges as the most striking feature of a two-factor ANOVA.
As you read about each study, (a) classify the type of research that it reflects, and (b) identify the kinds of conclusions that might reasonably be drawn from the results. The director of computer technology in Emerson School District wants to gather information about the use of technology-based instruction in language arts and literature classes in the district's middle schools and high schools. For her study, the director identifies five of the top teachers in these content areas. She visits and observes each teacher's classes on three different days and subsequently interviews each teacher. Then she summarizes the ways that these teachers incorporate the use of technology into their lessons and their students' activities. The director also summarizes teachers' beliefs about the roles of technology in students' learning and motivation. (a) Classify the research as one of the following: Quantitative/descriptive Quantitative/correlational…
Example 2: Multiple Sclerosis and Sunlight It is believed that sunlight offers some protection against multiple sclerosis, but the reason is unknown. Is it the vitamin D, the UV light, or something else? In an experiment, mice were injected with a substance to give them MS and were randomly assigned to either a control group (with no treatment), a group that received vitamin D supplements, or a group that got exposed regularly to UV light. The scientists found that mice exposed to UV-light were significantly less likely to get MS than the control mice, but that vitamin D did not seem to reduce the likelihood of getting MS compared to the control group. For these two tests, one of the p-values was 0.470 and one was 0.002. Which p-value goes with which test? Also, for each test, indicate whether we “Reject H0” or “Do not reject H0”. p-value =0.470 : p-value=0.002 :
In August and September 2005 , Hurricanes Katrina and Rita caused extraordinary flooding in New Orleans, Louisiana. Many homes were severely damaged or destroyed, and of those that survived, many required extensive cleaning. It was thought that cleaning flood-damaged homes might present a health hazard due to the large amounts of mold present in many of the homes. In a sample of 350 residents of Orleans Parish who had participated in the cleaning of one or more homes, 50 had experienced symptoms of wheezing, and in a sample of 176 residents who had not participated in the cleaning, 42 reported wheezing symptoms (numbers read from a graph). Can you conclude that there is a difference between the proportion of residents with wheezing symptoms who cleaned flood-damaged homes and those who did not participate in the cleaning? Let p1 denote the proportion of residents with wheezing symptoms who had cleaned flood-damaged homes and p2 denote the proportion of…
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Trichotillomania is an illness characterized by the repeated urge to tear out hair, eyelashes, facial hair, nose hair, pubic hair, eyebrows, or other body hair, sometimes resulting in noticeable bald patches. A pharmaceutical company is trying to decide whether to market a drug to treat trichotillomania. The pharmacist who designed the drug believes it is very effective, especially when combined with therapy, whereas a researcher who did research on a sample of people suffering from the disorder is less convinced. Each of them created graphs to support his or her position. Determine whether the pharmacist or the researcher created each graph. (Hint: Decide whether the graph minimizes or maximizes the effect of the drug first. Then decide who would want to do that, and choose your response from the list of possible combinations.)