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- A researcher believes that tomato variety has an effect on the yield response to side-dressed nitrogen. To account for this, the researcher grows two seedlings from each of the 10 tomato varieties. One seedling of each variety gets side-dressed nitrogen and the other receives no side-dressing. In this study, the observation for each variety in a sample is matched with the observation for the same variety in the other sample. Suppose the researcher intends to compare the two groups of tomato varieties. What is the unit of interest and variable of interest? What is the appropriate test procedure in comparing the two groups (with and without side dressing)?Which of these is true for the control group in an experiment? a.) It is not exposed to the factor under consideration and all other external influences are held constant. b.) It is exposed to the factor under consideration and all other external influences are varied. c.) It is not exposed to the factor under consideration and all other external influences are varied. d.) It is exposed to the factor under consideration and all other external influences are held constant.By using an independent samples t-test, this study found that fourth year students at ONLINE UNIVERSITY Q had significantly higher salaries (M=150,000, SD=3.8) than the first year students (M=88,000, SD=2.7), t(18) = 4.68, p <.05, Is it possible to compute the effect size from the information given in the problem? Why or why not?
- On average, a sample of n = 36 scores from a normal population with σ= 10 will provide a better estimate of the population mean than a researcher would get with a sample of n = 9 scores from a normal population with σ= 10.For any population, a z-score of -2.00 is a more extreme score than a z-score of +1.00. TRUE OR FALSEq3 The following data represent the net profits made by a sample of 25 companies that operate in real-state sector. 56 97 78 61 79 93 84 76 58 92 89 96 42 44 85 77 53 88 62 84 62 82 75 95 89 Choose the best graphical presentation and justify your Based on your answer in (1), construct the selected graphical presentation and comment on the Based on your answer in (2), do you think the sector performance is satisfactory? Justify your answer.
- Engro group, who recently sold its Engro foods start-up for a multi-million-rupees sum, islooking for another investment for fresh capital. It is considering an investment in coal (X) andsolar (Y) power plant. For that they had a collected data on 5 different characteristics. Amandahas applied k-means clustering to this data for k = 2. Given the following data:Table 5.1 Observations X Y 1 20 18 2 8 20 3 36 26 4 22 12 5 14 4 a) Which value of k is the most appropriate to categorize these investments? Justify yourchoice with calculations.b) The two cluster centers after the first round of execution. c) The final two clusters. d) Visually represent the clusters of both parts (b) and (c).We ask if visual memory ability for a sample of 25 art majors (X = 49) is better than that for a population of engineering majors (m = 45 and = 14). Higher scores indicate a better memory. (d) Compute zobt. (e) What is zcrit? (f) What do you conclude about differences in visual memory ability?A dietitian wishes to see if a person’s cholesterol level will be changed if the diet is supplemented by a certain mineral. Four subjects were pre-tested, and they took the mineral supplement for a 6-week period. The results are shown in the table. Is there sufficient evidence to conclude that the population mean of cholesterol levels has been changed after six weeks at α=0.2α=0.2? Assume that the differences are from an approximately normally distributed population. Subject Cholestrol Level (mg/dl) Cholestrol Level after 6 Weeks (mg/dl) dd ¯dd¯ (d−¯d)2(d-d¯)2 1 206 217 11 2 219 184 -35 3 202 204 2 4 213 205 -8 Total -30 a) Calculate the mean, the sum of the squared deviation from the mean, and the standard deviation of differences. Do not include the unit for each answer: ¯d=d¯= (do not round) ∑(d−¯d)2=∑(d-d¯)2= (do not round) sd=sd= (rounded to one decimal place) b) Perform the hypothesis test in the following steps: Step 1.…
- The Senator of Azenator State, is worried about the rising numbers in high blood pressure related deaths in his Jurisdiction and wants an end to this canker. A reputable medical research officer has claimed that, the situation is probably as a result of the ageing population of his State. The blood pressures, Y (mmHg), and Ages, X (years) of 10 hospital patients were sampled from Azenator State and summarized below. Patient A B C D E F G H I J Age(X) in Years 20 25 50 30 45 60 10 15 35 70 BP(Y) in (mmHg) 80 85 125 90 100 135 80 70 100 140 NB: Approximate to 2 decimal placesUse the table to answer the questions that follow;i) Calculate the product moment correlation coefficient for the data and interpret your result.ii) If the Senator decides to purchase and distribute Norvasc (a medicine that reduces blood pressure), based on your results in (i), which age group (youth or old adults) should be given priority? Briefly explain your answer. iii) Give a reason to support fitting…Are nursing salaries in Tampa, Florida, lower than those in Dallas, Texas? Salary data show staff nurses in Tampa earn less than staff nurses in Dallas. Suppose that in a follow-up study of 60 staff nurses in Tampa and 60 staff nurses in Dallas you obtain the following results: Tampa Dallas xbar 51900 53200 s 6000 6000 n 60 60 Tampa are lower than for those in Dallas. Use α=0.05. Let Tampa be population 1. What is the P value ?Find the corresponding z-score for a sample of n = 4 and M = 38 taken from a population with a mean of μ= 40 and σ = 8.