Suppose a study is conducted using only Boeing 737s traveling 800Kms oncomparable routes during the same season of the year. Can the number ofpassengers predict the cost of flying such routes? It seems logical that morepassengers result in more weight and more baggage, which could, in turn, result inincreased fuel consumption and other costs. Suppose the data displayed in thetable below are the costs and associated number of passengers for twelve 800-kmscommercial airline flights using Boeing 737s during the same season of the year.We will use these data to develop a regression model to predict cost by number ofpassengers. A plot of the data collected is shown in Figure 3.Cost600550500450400350300566778Number of Passengers89910Figure 3: Scatter plot of number of passengers on the x-axis andCost on the y-axis. b) Shown in Figure 4 is output from a regression analysis on the data plotted inFigure 3. Use the output to perform a hypothesis test, at the 5% significancelevel, to determine if there is a relationship between the two variables. Includeall steps in your response including the hypotheses, p-value, decision, andconclusion.c) The output in Figure 4 shows a confidence interval for the slope parameter.Provide the lower and upper limits of the 95% confidence interval and providean interpretation of the interval.d) Using the output in Figure 4, determine the estimated least squaresregression equation that represents the relationship between Cost (y) andnumber of passengers (x)?e) Use the regression equation from (d) to estimate the Cost when number ofpassengers are 80 and comment on the usefulness of this predictionSUMMARY OUTPUTRegression StatisticsMultiple RR SquareAdjusted R SquareStandard ErrorObservations0.95130.90500.8977162.195215Coefficients Standard Error t Stat P-value Lower 95%5.501 0.000 972.06811.129 0.0001600.78340.43632.587291.0223.633Upper 95%2229.49848.285InterceptNumber of PassengersFigure 4: Output from regression analysis on number of passengers / Cost data

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A car dealer wishes to learn whether they can predict customers preferred car make typebased on suburb so that they could distribute their mail advertising more effectively. Thetable below shows the number of people in a random sample of 245 and their current cars.
Ten subjects were given an attitude test on a controversial issue. Then they were shown a film favorable to the ten subject and the same attitude test was administered. Make a directional test at alpha 5%. *
Which of the following is NOT CORRECT? A) The past purchase frequency (freqi) affects the purchase probability positively – i.e., customers with high past purchase frequency are more likely to purchase our product in the next year than those with low past purchase frequency. B) In general, customers are likely to buy our product because the baseline parameter is negative. C) High-income customers are more likely to purchase our product in the next year than low- income customers because the coefficient corresponding to the income variable (incomei) is positive. D) Although the number of flyers (nmaili) positively affects the purchase probability, it is not guaranteed that sending flyers to customers as many as possible maximizes profits.
we can make a causal claim from the results of the chi-square test correct?
Identify the two procedures that can be used to compute the Spearman correlation.
We can make a causal claim from the results of the chi-square test ? tru or false
The authors of a paper investigated whether water temperature was related to how far a salamander would swim and whether it would swim upstream or downstream. Data for 14 streams with different mean water temperatures where salamander larvae were released are given (approximated from a graph that appeared in the paper). The two variables of interest are x = mean water temperature (°C) and y = net directionality, which was defined as the difference in the relative frequency of the released salamander larvae moving upstream and the relative frequency of released salamander larvae moving downstream. A positive value of net directionality means a higher proportion were moving upstream than downstream. A negative value of net directionality means a higher proportion were moving downstream than upstream. Mean Temperature (x) Net Directionality (y) 6.12 −0.088.11 0.25 8.57 −0.1410.51 0.00 12.5 0.08 12.04 0.03 12.45 −0.0717.93 0.29 18.34 0.23 19.84 0.24 20.3 0.19 19.02 0.14 17.78 0.05 19.67…
The authors of a paper investigated whether water temperature was related to how far a salamander would swim and whether it would swim upstream or downstream. Data for 14 streams with different mean water temperatures where salamander larvae were released are given (approximated from a graph that appeared in the paper). The two variables of interest are x = mean water temperature (°C) and y = net directionality, which was defined as the difference in the relative frequency of the released salamander larvae moving upstream and the relative frequency of released salamander larvae moving downstream. A positive value of net directionality means a higher proportion were moving upstream than downstream. A negative value of net directionality means a higher proportion were moving downstream than upstream. Mean Temperature (x) Net Directionality (y) 6.12 −0.088.01 0.25 8.57 −0.1410.61 0.00 12.5 0.08 11.94 0.03 12.55 −0.0717.93 0.29 18.24 0.23 19.84 0.24 20.3 0.19 19.12 0.14 17.78 0.05 19.57…
The authors of a paper investigated whether water temperature was related to how far a salamander would swim and whether it would swim upstream or downstream. Data for 14 streams with different mean water temperatures where salamander larvae were released are given (approximated from a graph that appeared in the paper). The two variables of interest are x = mean water temperature (°C) and y = net directionality, which was defined as the difference in the relative frequency of the released salamander larvae moving upstream and the relative frequency of released salamander larvae moving downstream. A positive value of net directionality means a higher proportion were moving upstream than downstream. A negative value of net directionality means a higher proportion were moving downstream than upstream. Mean Temperature (x) Net Directionality (y) 6.22 −0.08 8.01 0.25 8.67 −0.14 10.61 0.00 12.5 0.08 11.94 0.03 12.55 −0.07 17.93 0.29 18.34 0.23…
An insurance investigator has observed that people with some astrological signs tend to be safer drivers than people with other signs. Using insurance records, the investigator classified 150 people according to their astrological signs and whether or not they were involved in a car accident during the previous 12 months. Do the following data indicate a significant relationship between sign and accidents? Test with a = .05. Libra Leo Gemini Accident 7 4 19 No Accident 73 46 1
A doctor recorded the number of miles walked each day by patients over age 60 and the number of doctor visits in a year for 40 patients. The resulting data were used to conduct a hypothesis test to determine whether there is a linear relationship between the number of miles walked and the number of doctor visits. What are the correct hypotheses for the test?
A research team collected data on the time college students spent on an ordinary homework assignments, and is interested in finding out whether Temple University students dedicate more time to homework than what was reported in a nationwide survey of undergraduates. A)Identify the dependent (DV) variable B) Identify the levels of the independent variable (IV) C)Indicate whether the researcher’s hypothesis is directional or non-directional D)Write the null and research hypotheses (H0 and H1) in your own words

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