Core 120 Name: Chapter 14 Review 1. As part of a class project a teacher brings

Question

Core 120 Name: Chapter 14 Review 1. As part of a class project a teacher brings a targe jar containing 200 gumballs or two different colors: white and estimate how many of the gumballs are white. udent's job is to A student draws a sample of 20 gumballs, of which 4 are white and 16 are green. The st 2. To estimate the population in a rookery, 4965 fur seal pups were captured and tagged in early August. In late August, 910 fur seal pups were captured. Of these, 220 had been tagged. Based on these figured, estimate the population of fur seal pups in the rookery 3. Name the sampling method used to obtain the following sample. Chose your answer from the following: simple random sampling, convenience sampling, quota sampling, stratified sampling, or census. A) The first 30 students leaving the library are asked how much money they spent on books for the semester B) A student asks each person in the class how they did on the last exam to see how the grades were on the last exam. C) A fruit wholesaler randomly selects 2 crates of apples from Supplir A, 14 crates from Supplier B, and 4 crates from supplier C D) A fruit wholesaler numbers the crates 1 to 250, and selects 20 at random 6) A study was conducted to determine the effectiveness of a new serum for treating diphtheria, a common and often deadly respiratory disease. A researcher conducted his study over a one year period in one particular hospital. New diphtheria patients admitted to the hospital received different treatments based on the day of admission. Patients that were admitted on even days were treated with the new serum daily and received the standard treatment. Patients that were admitted on odd day were treated daily with the standard treatment only. Over the one year period of the study 7 of the 234 patients admitted on even days and treated with the serum died, whereas 35 of the 233 patients admitted on odd days died A) Describe the target population. B) Describe the sampling frame for the study. C) Describe the control and treatment groups for the study D) What conclusions can be drawn from the study?

Explanation / Answer

1.

there are total 200 gum balls:

when 20 was drawn:

white = 4

green = 16

% of white gumballs when 20 was drawn = 4/20 = 0.2 = 20%

assuming similar ratio for all the 200 gum balls present in the jar for estimation purpose:

20%*200 = 40 white

Hence, it is estimated that there are 40 white gumballs in 200 gumballs

2.

Early august tagged = 4965

late august captured = 910

220 already tagged

% of tagged in late august = 220/910 = 0.2418 = 24.18%

assuming same ratio were tagger in early august for estimation

Hence, 24.18% were tagged in early august

total population estimation = 4965/24.18% = 20533.5 = 20534 fur seal pups

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