# Question

An advertisement for SeldaneD,

a (now discontinued) drug prescribed for seasonal allergic rhinitis, reported results of a double-blinda study in which 374 patients took Seldane-D and 193 took a placebo (Time, 27 March 1995, p. 18). Headaches were reported as a side effect by 65 of those taking Seldane-D.

a. What is the sample proportion of Seldane-D takers who reported headaches?

b. What is the standard error accompanying the proportion computed in part (a)?

c. Construct a 95% confidence interval for the population proportion based on the information from parts (a) and (b).

d. Interpret the confidence interval from part (c) by writing a few sentences explaining what it means.

a (now discontinued) drug prescribed for seasonal allergic rhinitis, reported results of a double-blinda study in which 374 patients took Seldane-D and 193 took a placebo (Time, 27 March 1995, p. 18). Headaches were reported as a side effect by 65 of those taking Seldane-D.

a. What is the sample proportion of Seldane-D takers who reported headaches?

b. What is the standard error accompanying the proportion computed in part (a)?

c. Construct a 95% confidence interval for the population proportion based on the information from parts (a) and (b).

d. Interpret the confidence interval from part (c) by writing a few sentences explaining what it means.

## Answer to relevant Questions

Refer to Exercise 22. Of the 193 placebo takers, 43 reported headaches. a. Compute a 95% confidence interval for the true population proportion that would get headaches after taking a placebo. b. Notice that a higher ...A telephone poll reported in Time magazine (6 February 1995, p. 24) asked 359 adult Americans the question: “Do you think Congress should maintain or repeal last year’s ban on several types of assault weapons?” ...In this chapter technical detail were presented for finding a t-multiplier for constructing a confidence interval for a population mean. Use appropriate software, a calculator, or a website to find a confidence interval for ...Refer to Case Study 21.1 and the material in Part 1 of this book. a. In their original report, Thys-Jacobs and colleagues (1998) noted that the study was “double-blind.” Explain what that means in the context of this ...Suppose you were given a 95% confidence interval for the relative risk of disease under two different conditions. What could you conclude about the risk of disease under the two conditions if a. The confidence interval did ...Post your question

0