The Faber Floral Company in Kankakee, Illinois, claims to have developed a speci

Question

The Faber Floral Company in Kankakee, Illinois, claims to have developed a special spray for roses that causes the blossom to last longer than an untreated flower. Fifty long-stemmed roses are obtained and randomly assigned to one of two groups: treated versus untreated. The treated roses are sprayed, and the lifetime of each blossom is carefully recorded.

a) Is this an observational or an experimental study? Please explain your answer.

b) What is the unit or population in this study?

c) What is the factor or treatment in this study?

d) What is the outcome variable of this study?

e) State a possible source of bias in this study. Feel free to speculate beyond the explicit statement of the question. However, nothing that is assumed can be contradicted by what is stated. Please include any assumptions that you are making.

Explanation / Answer

Solution:

a) Experimental study. We investigate the effects of certain conditions (whether treated or nottreated) on individuals or objects (roses) in the sample

b) The population is all the roses that grow

c) The factors are treated and untreated

d) The outcome of this study is the time that roses last.

e)There are many possible sources of bias.

1) When the roses are sprayed, they are not sprayed consistently.

2) After the roses were sprayed (or not sprayed), they were not kept in the same condition.

3) The length of time after picking the roses was not the saem.

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