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35. A researcher wants to examine the effect of fertilizer and the effect of sunlight on the yield oftomatoes. She bought 60 tomato plants at a local garden store. She randomly assigned 30 tomatoplants to be planted on the sunny side of the hill and 30 to be planted on the shady side. The 30plants which are planted on the shady side are randomly assigned to one of three groups. The firstgroup are grown with no fertilizer, the second group with a small amount of fertilizer, and thethird group with a large amount of fertilizer. The 30 plants which are planted on the sunny side arelikewise randomly assigned to one of three groups. The first group are grown with no fertilizer, thesecond group with a small amount of fertilizer and the third group with a large amount offertilizer. All tomato plants are planted at the same time and are all treated alike (in terms of howmuch they are watered, weeded etc). Each plant is grown to maturity. The total weight of tomatoesobtained from each plant is recorded. Identify the factor(s) and the number of levels for each.A. Sunny, shady (2 levels)B. No fertilizer, small amount of fertilizer, large amount of fertilizer (3 levels)C. Fertilizer (3 levels), blocking variable -location (2 levels)D. No fertilizer and sunny, small amount of fertilizer and sunny, large amount of fertilizer andsunny, no fertilizer and shady, small amount of fertilizer and shady, large amount offertilizer and shady (6 levels)E. Fertilizer (3 levels), location (2 levels)35.
Identify the flaw(s) in the experiment or study described.36. Researchers reported that for men, being unmarried increases the risk of depression. These findingswere based on the medical records of 400 married men and 500 unmarried men. Since there is norandom assignment, this conclusion is not justified because there may be lurking variables. Whichof the following are possible lurking variables?I: Rate of depressionII: IncomeIII: Type of employmentIV: AgeV: Gender36.Determine whether the experiment is single-blind,double-blind,or neither.37. Is the Addison Wesley Algebra I text superior to the currently used text, in promoting learning ofalgebra? Evaluators only are informed that Group A will test from the current text and Group Bwill test from AW text.37.38. Is the aspirin produced by World's Best Pharmaceutical Company better than that of a competitorat relieving headaches? 200 headache suffers are chosen at random. Migraned Testing Serviceadministers the experiment and provides the results evaluation. Three levels are made: participantsreceive contents from Bottle A, Bottle B, or Bottle C. Other than the fact that one bottle containsplacebo aspirin, no other information is given to the testing service regarding the bottles' contents.38.