The headline of the article mentioned above implies causation. Explain in one or two sentences if implying causation is appropriate based on the study described
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A headline on a news website stated “Sheep with a varied diet grew faster and produced less pollutants, new study finds.” The article reports that scientists using pregnant sheep that were twin-bearing to test how diet affected the lambs. When the twin lambs were born, one lamb was put on a typical rye grass diet, while the other was given a variety of feeds, including chicory, plantain, red clover and lucerne. The impact was huge, with the lambs given a variety of feeds seeing a 100 per cent increase in growth, excreted less nitrogen into the environment and had an improved well-being.
The headline of the article mentioned above implies causation. Explain in one or two sentences if implying causation is appropriate based on the study described
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- Repeat Example 5 when microphone A receives the sound 4 seconds before microphone B.A headline on a news website stated “Sheep with a varied diet grew faster and produced less pollutants, new study finds.” The article reports that scientists using pregnant sheep that were twin-bearing to test how diet affected the lambs. When the twin lambs were born, one lamb was put on a typical rye grass diet, while the other was given a variety of feeds, including chicory, plantain, red clover and lucerne. The impact was huge, with the lambs given a variety of feeds seeing a 100 per cent increase in growth, excreted less nitrogen into the environment and had an improved well-being.Describe in one or two sentences what is the explanatory variable and what are the response variables mentioned in this study.My previous classmate researched on the relationship between children’s nutrition and their cognitive development and found out that children have less energy and less interest for learning when under-nutrition. What is the independent, dependent and extraaneous variable?
- By accident, Janae has been making decaffeinated coffee for her co-workers for the entire week. But some of her co-workers have claimed that the extra boost of caffeine has helped them focus on their work.What does the placebo effect mean in this specific situation? a.) The benefit is the result of the "control" (coffee, although decaffeinated) and not an effect of the "active ingredient" (caffeine). b.) The benefit is the result of the fact that the "treatment" (coffee, although decaffeinated) contains another "active ingredient" besides caffeine. c.) The benefit is due to the fact that the co-workers are given a "treatment" (coffee, although decaffeinated) and not an effect of the "active ingredient" (caffeine). d.) The co-workers get a benefit from the "treatment" (coffee, although decaffeinated) since they also drink coffee at the coffee shop across the street during breaks.A group of scientists studied the effect of a chemical on various strains of bacteria. Bacteria A started with 12000 cells and decreased at a constant rate of 3000 cells per hour after the chemical was applied. Strain B started with 4000 cells and decreased at a constant rate of 2000 cells per hour after the chemical was applied. When will the strains have the same number of cells?Explain what is meant by the concept that main effects and interactions are independent.
- .The worker has noticed that the more time he spends at work (x), the less money he is likely to make (y) in conducting transactions for his firm. Which of the regression equations MOST suggests such a possibility?The scatterplot of these two variables reveals a potential outlying month when the average temperature is about 53◦F and average crawling age is about 28.5 weeks. (a) Does this point have high leverage? (b) Is it an influential point?You are recently promoted as the chief traffic management officer of a major city in the country. Based on recent data, you learned that one of the leading causes of road accidents is over speeding. In your desire to minimize road accidents, you went out to observe how traffic management rules are implemented on the streets. Your attention was caught by a fast - moving car that seemed to be breaking the speed limit of 100 kilometers per hour(km/hr.), and so you followed it along the highway. After a short time, the driver of the car noticed you and started to slow down. Eventually, he stopped on the side of the road. Supposed the speed of the car had been noted during this time and is modeled by the quadratic equation y = 3x² + 17x - 20, where y represents the speed of the car in km/hr. and x represents the number of minutes after you started following the car. How long did it take for the car to be under surveillance before it could finally stop on the side of…
- Ten years ago, the town of Easton decided to increase its annual spending on education so that its high school graduates would be able to earn higher wages. Now Easton has asked you to evaluate the effectiveness of the spending increase. Their data show that before the spending increase, the average annual salary of recent high school graduates was $25,000 and that now that average salary has risen to $28,500. Fortunately for your analysis, a neighboring community (Allentown) did not change its annual spending on education. Ten years ago, recent Allentown high school graduates earned an average of $22,500, and now that average is $23,750. (b) What underlying assumption do you have to make in order for your estimate to be valid? What might cause your underlying assumption to be invalid?Ten years ago, the town of Easton decided to increase its annual spending on education so that its high school graduates would be able to earn higher wages. Now Easton has asked you to evaluate the effectiveness of the spending increase. Their data show that before the spending increase, the average annual salary of recent high school graduates was $25,000 and that now that average salary has risen to $28,500. Fortunately for your analysis, a neighboring community (Allentown) did not change its annual spending on education. Ten years ago, recent Allentown high school graduates earned an average of $22,500, and now that average is $23,750. (a) Use a difference-in-differences estimator to determine whether Easton’s spending increase caused the wages of their high school graduates to increase. please provide an accurate answer.The following table shows the length, in centimeters, of the humerus and the total wingspan, in centimeters, of several pterosaurs, which are extinct flying reptiles. (A graphing calculator is recommended.) (a) Find the equation of the least-squares regression line for the data. (Where × is the independent variable.) Round constants to the nearest hundredth. y= ? (b) Use the equation from part (a) to determine, to the nearest centimeter, the projected wingspan of a pterosaur if its humerus is 52 centimeters. ? cm