Question

In: Statistics and Probability

researcher wishes to investigate the effects of nitrogen fertilizer on the growth of hot pepper. The...

researcher wishes to investigate the effects of nitrogen fertilizer on the growth of hot pepper. The land available for the study is sloping in a north-south direction and appears to have a fertility gradient in an east-west direction.

(a) Choose an appropriate experimental design and give reasons for your choice.

(b) Write an appropriate null hypothesis.

(c) Identify the target population in this study.

(d) State the possible sources of variation in the experiment.

(e) Provide a diagrammatic representation of the field layout.

Solutions

Expert Solution


Related Solutions

2. An experiment was conducted to test the effects of nitrogen fertilizer on lettuce production. Five...
2. An experiment was conducted to test the effects of nitrogen fertilizer on lettuce production. Five rates of ammonium nitrate were applied to four replicate plots in a completely randomized design. The data are the number of heads of lettuce harvested from the plot. Use α =0.05 Write the statistical effects model and completely specify each component. State the necessary assumptions for the analysis. Perform the appropriate analysis, identify what hypotheses are being tested, the test statistic, critical value and...
A farmer wishes to test the effects of a new fertilizer on her tomato yield. She...
A farmer wishes to test the effects of a new fertilizer on her tomato yield. She has four equal-sized plots of land-- one with sandy soil, one with rocky soil, one with clay-rich soil, and one with average soil. She divides each of the four plots into three equal-sized portions and randomly labels them A, B, and C. The four A portions of land are treated with her old fertilizer. The four B portions are treated with the new fertilizer,...
A researcher wishes to test the effects of excerise on the ability to complete a basic...
A researcher wishes to test the effects of excerise on the ability to complete a basic skills test. He designs a pre-test and post-test to give to each participant. You believe that there was an increase in the scores. You believe the population of the differences is normally distributed, but you do not know the standard deviation. When calculating difference use Post-test minus Pre-test. pre-test post-test 52 60 60 55 44 49 92 94 84 76 55 65 64 58...
4. A statistical researcher wishes to investigate the relationship between a student’s study time and their...
4. A statistical researcher wishes to investigate the relationship between a student’s study time and their ultimate exam grade for that exam. The following data is determined: X=study time(hours) 4 7 8 9 12 Y=exam grade (1 to 25 scale) 11 16 14 22 17 Ex=40     Ex2=354          and Exy=670 Ey=80      Ey2=1346 Sketch the scatter diagram. Does the trend appear to be positive or negative? given that E(x-xbar)2=34, Please use that comment to help determine the sample standard deviation for the...
a medical researcher wishes to investigate whether oil consumption in pregnant mothers and the subsequent development...
a medical researcher wishes to investigate whether oil consumption in pregnant mothers and the subsequent development of asthma in their children, the researcher randomly assigned 736 pregnant women at 24 weeks of gestation to receive fish oil or a placebo (olive oil) daily, Neither the researcher nor the participants were aware of the group assignment during follow up for the first 3 years of the children lives, after which there was a 2year follow up period during which only the...
A researcher wishes to investigate the idea that eating sea salt raises blood pressure less than...
A researcher wishes to investigate the idea that eating sea salt raises blood pressure less than eating normal table salt. He randomly selects two groups, each with 13 people. He arranges that Group 1 will be on a high sea salt diet for 2 weeks, while Group 2 will be on a high table salt diet. He measures their blood pressure after the two weeks. The mean systolic blood pressure for Group 1, x¯1x¯1, is found to be 126 with...
A 0.608 g sample of fertilizer contained nitrogen as ammonium sulfate. It was analyzed for nitrogen...
A 0.608 g sample of fertilizer contained nitrogen as ammonium sulfate. It was analyzed for nitrogen by heating with sodium hydroxide. The ammonium was collected in 46.3 mL of 0.213 M HCL with which it reacted. The solution was titrated with excess HCL requiring 44.3 Ml of 0.128 M NaOH. What is the percentage of nitrogen in the fertilizer?
A researcher investigated the effects of green and red light on the growth rate of bean...
A researcher investigated the effects of green and red light on the growth rate of bean plants.  The table below summarizes the heights (in inches) of bean plants from soil to first branching stem.   Light Sample Mean Sample Standard Deviation Sample Size Red 8.36 1.50 17 Green 8.94 2.78 25 (A – 10 pts.)  Use the Pooled two-sample t-procedure to construct the 95% confidence interval for the difference in mean height for bean plants exposed to these two colors of light.  (You do...
4) The time (in number of days) until maturity of a certain variety of hot pepper...
4) The time (in number of days) until maturity of a certain variety of hot pepper is Normally distributed, with mean μ and standard deviation σ = 2.4. This variety is advertised as taking 70 days to mature. I wish to test the hypotheses H0: μ = 70, H1: μ ≠ 70, so I select a simple random sample of four plants of this variety and measure the time until maturity. The four times, in days, are 70 72 79...
Let V denote the number of units of a variable input (i.e., nitrogen fertilizer) that is...
Let V denote the number of units of a variable input (i.e., nitrogen fertilizer) that is used in combination with a fixed input (i.e., land). Let TP denote the total amount of production of a crop (i.e., corn) that is obtained from using each input level.   Point A is a point of inflection. 1. TP increases at a decreasing rate ____________.  (Points: 20) a. from O to A b. from A to C c. beyond point O d. beyond point C...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT