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Question: DDT is a pesticide that has been banned from use in the United States and most other areas of the world. It is quite effective, but persisted in the environment and over time became seen as harmful to higher-level organisms. Famously, egg shells of eagles and other raptors were believed to be thinner and prone to breakage in the nest because of ingestion of DDT in the food chain of the birds. An experiment was conducted on the number of eggs (fecundity) laid by female fruit flies. There are three groups of flies. One group was bred to be resistant to DDT (the RS group). Another was bred to be especially susceptible to DDT (SS). Finally there was a control line of non-selected or typical fruitflies (NS). Here are the data:
The values are the average number of eggs laid daily for each of 75 flies (25 in each group) over the first 14 days of their lives. Using a 1% level of significance, are the mean rates of egg selection for the three strains of fruitfly different? If so, in what way? Specifically, the researchers were interested in whether or not the selectively bred strains were different from the nonselected line, and whether the two selected lines were different from each other.
Describe the role of statistics in business decision-making
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a patient receiving a yearly physical examination and must have 16 checks or tests performed. the sequence in which the
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1. a random sample of size 49 is drawn from a population with a standard deviation of 11. if only 18 of the time a
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your firm which sells a technologically advanced product directly to consumers has developed a new website that has a
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Whether or not the student procrastinates in doing assignments; confounding variable = number of hours per week the student spends socializing.
a human resource manager at a large company wants to estimate the proportion of employees that would be interested in
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