A researcher predicts that smoking cigarettes decreases a person s sense
A researcher predicts that smoking cigarettes decreases a person’s sense of smell. On a test of olfactory sensitivity, the µ for nonsmokers is 18.4. A sample of people who smoke a pack a day produces these scores:

16 14 19 17 16 18 17 15 18 19 12 14

(a) What are H0 and Ha for this study?

(b) Compute tobt.

(c) With a = .05, what is tcrit?

(d) What should the researcher conclude about this relationship?

(e) Compute the confidence interval for µ.

A researcher predicts that smoking cigarettes decreases a person s sense

 

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