Example 13.14 A survey of 200 firms found the following evidence regarding profitability and markershare.Market shareProfitabilityUpto 10%11-25%> 25%TotalLow36141666Medium26221664High16243070Total786062200Do you find that the above data give you significant evidence to conclude that market share and prof-itability are related? Test the hypothesis at 0.01 level of significance.

Answer! -From the given data, we set up the two hypotheses as follows:Ho: Market share and…

Answered: Example 13.14 A survey of 200 firms…

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

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter4: Equations Of Linear Functions

Section4.5: Correlation And Causation

Problem 2CYU

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Urban Travel Times Population of cities and driving times are related, as shown in the accompanying table, which shows the 1960 population N, in thousands, for several cities, together with the average time T, in minutes, sent by residents driving to work. City Population N Driving time T Los Angeles 6489 16.8 Pittsburgh 1804 12.6 Washington 1808 14.3 Hutchinson 38 6.1 Nashville 347 10.8 Tallahassee 48 7.3 An analysis of these data, along with data from 17 other cities in the United States and Canada, led to a power model of average driving time as a function of population. a Construct a power model of driving time in minutes as a function of population measured in thousands b Is average driving time in Pittsburgh more or less than would be expected from its population? c If you wish to move to a smaller city to reduce your average driving time to work by 25, how much smaller should the city be?
A research group is interested in the relationship between exposure to mold in households after a major hurricane and the onset of acute respiratory illness in children. Suppose an observational study is conducted over 10 years following the natural disaster and the following two-by-two table was created in order to address the relationship between exposure and outcome. Acute Respiratory Illness No Acute Respiratory Illness Total Mold 378 156 534 No Mold 73 260 333 Total 451 416 867 Calculate the incidence of acute respiratory illness in the exposed and unexposed. Calculate the relative risk for ARI due to exposure in this study Interpret your findings from part B
Question FourThe following data represent the net profits made by a sample of 25 companiesthat operate in real-state sector.56 97 78 61 7993 84 76 58 9289 96 42 44 8577 53 88 62 8462 82 75 95 891) Choose the best graphical presentation and justify your answer.2) Based on your answer in (1), construct the selected graphical presentationand comment on the results.Based on your answer in (2), do you think the sector performance is satisfactory?Justify your answer.
which of the following individuals is likely to be excluded from a clinical trial? a-individual with other diseases besides the disease of interest b-an individual whose data is considered to be an outlier c-an individual of who is considered to be a minority d-an individual who will have difficulty complying trial protocols.

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