In order to determine whether factors influence or interact with each other, a researcher must use two experiments. a factorial design. a between-subjects design. a mixed design.
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- What is the benefit of a factorial design that is not present in a single factor study is that you can what?How many separate groups of participants would be needed for an independent-measures, two-factor study with 2 levels of factor A and 3 levels of factor B?A few years ago, a cola manufacturer invited New Zealand consumers to take a blind taste test. Consumers were asked to decide which of two sodas, Brand 1 or Brand 2, they preferred. The manufacturer was interested in determining what factors played a role in people's taste preferences. One of the factors studied was which part of New Zealand the consumers lived in, and for this purpose the manufacturer divided consumers into South Islanders and North Islanders. If the true consumer population proportion of North Islanders who prefer Brand 1 is pN and the true consumer population proportion of South Islanders who prefer Brand 1 is pS, what null and alternative hypotheses should be used to test whether a larger proportion of North Islander consumers than South Islander consumers prefer Brand 1? ] Select one: a.H0 : pN - pS > 0, Ha : pN - pS = 0 b.H0 : pN - pS = 0, Ha : pN - pS ≠ 0 c.H0 : pN - pS = 0, Ha : pN - pS ≥ 0 d.H0 : pN - pS = 0, Ha : pN - pS > 0
- onrad wants to conduct a survey of students at his middle school to determine which sports they prefer to play.Which two survey methods would likely generate fair and impartial results?In New York City on October 23rd, 2014, a doctor who had recently been treating Ebola patients in Guinea went to the hospital with a slight fever and was subsequently diagnosed with Ebola. Soon thereafter, an NBC 4 New York/The Wall Street Journal/Marist Poll found that 82% of New Yorkers favored a mandatory 21-day quarantine for anyone who has come in contact with an Ebola patient''. This poll included responses of 1,042 New York adults between Oct 26th and 28th, 2014.What is the point estimate in this case? What is the sample size? Are the central limit theorem conditions met? Explain. Calculate the standard error for ˆpp^. Construct a 95% confidence interval for pp, the proportion of New York adults who supported a quarantine for anyone who has come into contact with an Ebola patient. With ______ % confidence, the proportion of all New York adults who supported a quarantine for anyone who has come into contact with an Ebola patient is between____ and ____.In an online poll run by a Hong Kong newspaper, 45% of people declared they go to the gym once a week, 25% go two times, 10% go three times, and the rest do not go. The data were collected through telephone interviews with 650 people; 230 answered they do not go to a gym at all, 150 go once a week, 200 go twice a week, and the rest go three times each week.a. Can this be considered to be a multinomial experiment? Which characteristics must it have to be classified as such?b. Would you use a goodness of fit test? Why?c. What conclusions would you gather from it? Do the online results match the phone interviews?d. If not, could you suggest any reasons why they are different?
- A taste-testing survey of Zing Farms showed that 2/3 of the people surveyed preferred the taste of veggie burgers to regular burgers. If 90,000 people were in the survey, how many favored veggie burgers? How many chose regular burgers?The Consumer Reports Restaurant Customer Satisfaction Survey is based upon 148,599 visits to full-service restaurant chains. One of the variables in the study is meal price, the average amount paid per person for dinner and drinks, minus the tip. Suppose a reporter for the Sun Coast Times thought that it would be of interest to her readers to conduct a similar study for restaurants located on the Grand Strand section in Myrtle Beach, South Carolina. The reporter selected a sample of 8 seafood restaurants, 8 Italian restaurants, and 8 steakhouses. The data in Sheet 7 show the meal prices ($) obtained for the 24 restaurants sampled. Use alpha = 0.05 to test whether there is a significant difference among the mean meal price for the three types of restaurants. Sheet 7 Italian Seafood Steakhouse 12 16 24 13 18 19 15 17 23 17 26 25 18 23 21 20 15 22 17 19 27 24 18 31 Select one: a) Fstat = 7.33 > Fcrit = 3.47, insufficient evidence to reject the null…When a company , while doing research tries to look at 2 or more treatments simultaneously , the type of experimental design is a. Factorial design b. Randomised Block design c. Completely randomized block design d. Latin square design
- A telecommunication company proposed construction of a cell site tower in a certain city. To determine whether this is to be constructed, a vote is to be taken among the residents of a city and the surrounding barangays. Many residents in the barangays feel that the proposal will pass because of the large proportion of city voters who favor the construction. A poll is taken to determine if there is a significant difference in the proportion of city voters and barangay voters favoring the proposal. If 250 of 400 city voters favor the proposal and 360 of 500 barangay residents favor it, would you agree that the proportion of city voters favoring the proposal is higher than the proportion of barangay voters? Use a 0.025 level of significance.If the Syracuse men's basketball team won 18 games and lost 10, and the Syracuse women's basketball team won 15 and lost 9, what is the overall frequency of losses for the two teams?"The manager of a library that is open to residents of two towns, Royal Center and Winamac, wants to know if the proportion of households from Royal Center that use the library is smaller than the proportion of households from Winamac. In order to test this, the library manager asks 45 households in Royal Center and 49 households in Winamac whether anyone in their household had used the library last summer. 23 of the households surveyed in Royal Center responded "yes", and 35 of the households in Winamac responded "yes". Find the p-value that would be used to make a conclusion for this hypothesis test.
