Question

Determine whether the underlined value represents a parameter or a statistic. Using past figures from an extensive survey of 10,000 people it is predicted that 19% of the registered voters in California will vote in the primary. Explain.

2) Determine whether the quantitative variable is discrete or continuous. Explain. The speed of a car on a Boston tollway during rush hour traffic Determine whether the study depicts an observational study or an experiment.

3) A medical researcher obtains a sample of adults suffering from diabetes. She randomly assigns 95 people to a treatment group and 95 to a placebo group. The treatment group receives a medication over a period of three months and the placebo group receives a placebo over the same time frame. At the end of three months the patients' symptoms are evaluated. Explain.

4) A researcher obtained a random sample of 100 smokers and a random sample of 100 nonsmokers. After the 200 participants answered 10 unbiased questions on a computer the researcher compared the rate of depression among the smokers with the rate of depression among nonsmokers. Identify the sampling technique used. Explain.

5) A researcher randomly selects and interviews fifty male and fifty female teachers. 1 Provide an appropriate response.

6) On a recent Statistics test, the scores were 15, 66, 66, 81, 82, 83, 85, 88, 90, 92, 93, and 95. Is the mean a good representation of the center of data? If not what is a better alternative? Explain.

Answer 1

1)

this is statistic as it is based on sample

2)

variable is continuous as speed can take any value

3)

Observational studies are ones where researchers observe the effect of a risk factor, diagnostic test, treatment or other intervention without trying to change who is or isn’t exposed to it.

Experimental studies

Experimental studies are ones where researchers introduce an intervention and study the effects. Experimental studies are usually randomized, meaning the subjects are grouped by chance.

this is experimental as researcher gives treatment (placebo/ medication)

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