soln4301 - 1 a The study is observational because the...

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1. a) The study is observational because the researcher simply observed/gathered information. b) The target population is most likely all commercial bell pepper fields in some specified area (or all quadrats associated with all commercial bell pepper fields in some specified area). The study population is some subset of those fields available to the researchers for study with the two fields being chosen in some manner. It is also possible that the two fields were the only fields available to the researchers and so those two fields form the study population (or all quadrats associated with those two commercial bell pepper fields). The answer could also be that the target population, the study population and the sample are all the same – the two fields studied (or all quadrats associated with those two commercial bell pepper fields). c) For soil moisture content, the unit is the quadrat with all quadrats being selected from each field. d) For soil moisture content, the item of measurement is the sample of soil taken from the quadrat so you could also say it is the quadrat since only one sample of soil is taken per quadrat. 2. a) The study is experimental since the researcher manipulated the covariate, length of drought. b) The target population is most likely a specific variety of onion plants. The researcher would like her results to apply to this target population, but her sample of 30 was most likely not randomly selected from a population – she simply grew the needed onion plants in her lab. It is a convenience sample so
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