Do these data provide good evidence that increasing the temperature causes the yield to increase, within the range of the data? Or might the result be due to confounding? Explain.
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a )Do these data provide good evidence that increasing the temperature causes the yield to increase, within the
The correlation between temperature and stirring rate is
r = 0.9467
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- Find the mean hourly cost when the cell phone described above is used for 240 minutes.A farmer in Indiana wants to examine the relation between the number of very hot days (days when the high temperature exceeds 95° F) and the corn production of his farm (in bushels of corn per acre). He looks at the data for 10 summers. Let x¡ = the number of hot days during the ith summer. %3D = the corn production (in bushels per acre) during the ih summer. Let yi The data are in the table below:. 4 6. 7 8. 9. 10 i 2 14 10 7. 8. 1 12 Xi Yi 95 80 83 87 88 85 99 102 79 95 a) Make a scatterplot of the data. b) Examine your scatterplot and, without performing any calculations, EXPLAIN whether you expect the correlation coefficient to be closer to -1, 0, or 1 and WHY. c) Find the sample mean and standard deviation for each variable. %3D %3D S. %3D y d) Place an asterisk on your scatterplot at the point (x,ỹ).llustration 13.7. Construct the cost of living index number for the year 1966 from the following data: 1953 (BASB) Commodity Quantity Consumed (Go) Price 1966 (po) Price pn A 25 16 35 36 7 48 12 3.5 16 2.5 10 E 28 4 28
- Radon is a gas emitted from the ground that can collect in houses in buildings. At certain levels it can cause lung cancer. Radon concentrations are measured in picocuries per liter (pCi/L). A radon level of 4 pCi/L is considered “acceptable” Radon levels in a house vary from week to week. In one house, a sample of 6 weeks had the following readings for radon level (in pCi/L): 1.9 2.8 3.9 3.9 4.2 5.7 Find the variance and standard deviation (definitional formula). Show your work using a table.Show your complete solutions The carbon monoxide (CO) level in a manufacturing plant is supposed to be about 50 parts per million (ppm). However the actual CO levels are quite variable. Ten CO measurements are taken at various times during the day: Test if the average carbon monoxide (CO) level is not 5 0 ppm at the manufacturing plant if the population standard is 8.07. Use 10% level of significanceore on last attempt: 0.5 out of 1 (parts: 0.17/0.17, 0/0.17, 0.17/0.17, 0.17/0.17, 0/0.17, 0/0.15) Score in gradebook: 0.5 out of 1 (parts: 0.17/0.17, 0/0.17, 0.17/0.17, 0.17/0.17, 0/0.17, 0/0.15) Try another similar question Question with last attempt is displayed for your review only The table below lists a random sample of 50 speeding tickets on I-25 in Colorado. 0-10 mph over limit 10-20 mph over limit More than 20 mph over limit Total Male 9 9 17 35 Female 2 9 4 15 Total 11 18 21 50 Round to the fourth.a) If a random ticket was selected, what would be the probability that the driver was female? b) Given that a particular ticket had a male offender, what is the probability that they were more than 20 mph over the limit?c) Given that a particular ticket was 10-20 mph over the limit, what is the probability that the driver was female? d) If a random ticket was selected, what would be the probability that the driver was a male? e) If a random ticket was…
- We have measurements from eight companies for the % workforce change in 2010 from 2009 and the % change in profits from 2010 to 2011. % workforce change (x): 1.0 % profit change (y): 1.5 -0.4 -2.6 -3.8 -5.8 -2.5 -0.1 0.4 0.4 0.1 -0.2 -0.5 -7.5 0.2 0.3 We can calculate: Er = -12.7, Ex² = 64.51, Συ--6.8 , Σ 57, Σεy- 46.35. Find the sample correlation between the two variables, and fit a simple linear model to the dataset. Also, plot the residuals, ri, against xi, and comment on the fit of the model.Find the appropriate value of t for 95% CI with n=31.The population of Ada County, Idaho has been steadily increasing for more than 20 years. The table below shows the population (people) from 2015 through 2019 in Ada County. year 2015 2016 2017 2018 2019 population 432,862 444,486 456,548 468,764 481,587 a. What is the average rate of change in the population of Ada County from 2015 to 2018? Round to the nearest whole person and include units. b. What is the average rate of change in the population of Ada County from 2016 to 2018? Round to the nearest whole person and include units. c. What is the average rate of change in the population of Ada County from 2017 to 2018? Round to the nearest whole person and include units. d. What is the average rate of change in the population of Ada County from 2018 to 2019? Round to the nearest whole person and include units. e. Give a good approximation for the rate at which the population of Ada County is growing by the end of 2018? Round to the nearest whole person and include units.
- A chemical engineer is studying the effect of temperature and stining rate on the yield of a certain product. The process is run 16 times, at the settings indicated in the following table. The units for yield are percent of a theoretical maximum. Temperature (*C) Stirring Rate (1pm) Yield (%) 110 30 70.27 110 32 72.29 111 34 72.57 111 36 74.69 112 38 76.09 112 40 73.14 114 75.61 114 44 69.56 117 74.41 117 73.49 122 79.18 122 52 75.44 130 54 81.71 130 56 83.03 143 58 76.98 143 60 80.99 Compute the correlation between temperature and yield, between stinring rate and yield, and between temperature and stiring rate. Do these data provide good evidence that increasing the temperature causes the yield to increase, within the range of the data? Or might the result be due to confounding? Explain. Do these data provide good evidence that increasing the stiring rate causes the yield to increase, within the range of the data? Or might the result be due to confounding? Explain. a. Б. C.The population of a small country by year is shown in the table below. Year 1960 1955 284496 Population 367825 The absolute change in the between 1960 and 1965 is: 83329 The percentage change in the population between 1960 and 1965 : 773 • The average rate of change in the population between 1960 and 1965 is: Interpolate to predict the population of the state in 1963. • Interpolate to predict the population of the state in 1968. • Extrapolate to predict the population of the state in 1977. 1965 1970 510844 679471 (Round your answer to o ong decimal place) people per year (Give your exact answer) people people (Round to the nearest whole number) people (Round to the nearest whole number) people (Round to the nearest whole number)To determine the effect of temperature on the yield of a certain chemical process, the process is run 24 times at various temperatures. The temperature (in °C) and the yield (expressed as a percentage of a theoretical maximum) for each run are given in the following table. The results are presented in the order in which they were run, from earliest to latest. Order Temp Yield 30 49.2 32 55.3 3 35 53.4 4 39 59.9 31 51.4 27 52.1 33 60.2 34 60.5 25 59.3 10 38 64.5 11 39 68.2 12 30 53.0 13 30 58.3 14 39 64.3 15 40 71.6 16 44 73.0 17 34 65.9 18 43 75.2 19 34 69.5 20 41 80.8