Obtain the descriptive statistics for each type of fertilizer.
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- Compare the two separate scatterplots. In particular, how do the associtation compare between women with pets vs. women without pets? Does one group have more variation in systolic blood pressure than the other? If so, for which group? Does systolic blood pressure seem higher for common ages between the two groups? If so, for which group?the soil biogeochemistry in Californian salt marshes wished to explore how two of the most common plant species, pickleweed and pacific cordgrass, affected the accumulation of nitrogen in the soil. They measured the concentration of ammonium, a molecular form of organic nitrogen, in the soil, and measured or manipulated the density of pickleweed and cordgrass. Manipulations of ½ meter square plots (20 plots per manipulation) included removing all cordgrass (cordgrass removal), removing all pickleweed (pickleweed removal), or mixed (the control - nothing removed, thus mixed plots included a mixture of natural pickleweed and cordgrass). Boxplots of ammonium concentrations in each of the three manipulation treatments. Letters indicate differences among means as determined by a Tukey posthoc test following ANOVA. (b) Overall relationship between cordgrass stem density and soil ammonium content (includes data from all plot treatments). The solid black line and the gray shading represent the…In an agricultural experiment, the effects of two fertilizers on the production of limes were measured. Twenty-three randomly selected plots of land were treated with a brand new fertilizer, and 21 randomly selected plots were treated with an old fertlizer. The number of pounds of harvested limes were measured from each plot. The results are given below. (Round answers to two decimal places.)Data: New Fertilizer Old Fertilizer 412 480 434 472 436 485 418 453 412 470 415 464 412 482 438 466 439 481 443 470 427 472 426 466 439 493 427 471 438 495 430 479 411 467 424 476 419 493 424 485 425 482 437 420 Find a 90% confidence interval for the difference between the mean weight of the harvested limes.margin of error: lower limit: upper limit: Based on the results, is the new fertilizer better than the old fertilizer? Yes, we are 90% confident that new fertilizer is better than old fertilizer. It's not clear if the new fertilizer is…
- In an agricultural experiment, the effects of two fertilizers on the production of limes were measured. Fourteen randomly selected plots of land were treated with a brand new fertilizer, and 18 randomly selected plots were treated with an old fertlizer. The number of pounds of harvested limes were measured from each plot. The results are given below. (Round answers to two decimal places.) New F. Old F. 498 429 485 428 469 427 481 421 472 412 475 419 488 431 468 436 460 415 469 428 475 417 471 437 476 437 470 420 416 426 427 419 Find a 99% confidence interval for the difference between the mean weight of the harvested limes.margin of error: lower limit: upper limit:The average weight of a Coastal male Grizzly Bear is approximately normal with E(x); =795 pounds and SD * (x) = 80 pounds. 8. How likely is it to randomly select 64 Coastal male Grizzly Bears with a sample average weight of 810 pounds or more? Which density curve is the best model for this problem?In an agricultural experiment, the effects of two fertilizers on the production of limes were measured. Nineteen randomly selected plots of land were treated with a brand new fertilizer, and 27 randomly selected plots were treated with an old fertlizer. The number of pounds of harvested limes were measured from each plot. The results are given below. (Round answers to two decimal places.) New Fertilizer Old Fertilizer 486 435 468 423 491 425 470 440 458 423 476 409 456 425 463 443 493 402 501 437 483 420 475 420 456 416 470 435 463 421 473 445 479 422 460 424 467 412 435 427 413 407 420 430 426 430 Find a 90% confidence interval for the difference between the mean weight of the harvested limes.margin of error: lower limit: upper limit: Based on the results, is the new fertilizer better than the old fertilizer? A) Yes, we are 90% confident that new fertilizer is better than old fertilizer. B) No, we are 90%…
- For a research study with 2 levels of factor A, 4 levels of factor B, and n = 8 in each treatment condition, what are the df values for the F-ratio evaluating the main effect for factor A?a. Compute the incidence rate of coronary artery disease in patients receiving the new cholesterol medication. b. Compute the incidence rate of coronary artery disease in patients receiving a placebo. attached is the image of the data for this problemIn forestry, the diameter of a tree at breast height is used to model the height of the tree. Silviculturists working in British Columbia’s boreal forest conducted a series of spacing trials to predict the heights of several species of trees. The data are the breast height diameters (in centimeters) and heights (in meters) for a sample of 18 white spruce trees. B1 B2 18.9 20.0 15.5 16.8 19.4 20.2 20.0 20.0 29.8 20.2 19.8 18.0 20.3 17.8 20.0 19.2 22.0 22.3 16.6 18.8 15.5 16.9 13.7 16.3 27.5 21.4 20.3 19.2 22.9 19.8 14.1 18.5 10.1 12.1 5.8 8.0 B1: Breast Height Diameter of White spruce (cm) B2: Height (m) a) Plot the relationship using scatter diagram between the breast height diameters and the trees’ height. Are the breast height diameters and the trees’ height linearly related? What can you infer about the relationship between the two variables? Is a linear model appropriate? b) Compare the scatter plot in (a) with the correlation coefficient…
- In a test of braking performance, a tire manufacturer measured the stopping distance for one of its tire models. On a test track, a car made repeated stops from 100 kilometres per hour. The test was run on both dry and wet pavement, with the accompanying results.The performance of two analysts in determining total mercury (mg / kg) in fish was evaluated using the absorption spectrometry method. The results on the concentrations of mercury found in fish, for each analyst, are presented in the table below: Analyst 1 Analyst 2 7 12 9 8 6 9 11 13 13 14 8 9 7 8 13 10 12 7 9 15 (a)Is the performance in determining total mercury for Analyst 1 more accurate than Analyst 2? Compare the accuracy in the results of the two analysts at a 95% confidence level. Explain. (b)Are the results obtained by the two analysts, in the concentrations of mercury found in the fish, statistically equivalent, with 95% confidence? ExplainIf a newborn lab rat receives a hormone and its weight (in ounces) is converted into a z score that is greater than +2.00, what would the researcher most likely conclude about whether or not the hormone had an effect on the rat's weight?
