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Chapter 12: Q. AP4.35 (page 833)

AP4.35 In a clinical trial, 30 patients with a certain blood disease are randomly assigned to two groups. One group is then randomly assigned the currently marketed medicine, and the other group receives the experimental medicine. Every week, patients report to the clinic where blood tests are conducted. The clinic technician is unaware of the kind of
medicine each patient is taking, and the patient is also unaware of which medicine he or she has been given. This design can be described as
a. a double-blind, completely randomized experiment, with the currently marketed medicine and the experimental medicine as the two treatments.
b. a single-blind, completely randomized experiment, with the currently marketed medicine and the experimental medicine as the two treatments.
c. a double-blind, matched pairs design, with the currently marketed medicine and the experimental medicine forming a pair.
d. a double-blind, block design that is not a matched pairs design, with the currently marketed medicine and the experimental medicine as the two blocks.
e. a double-blind, randomized observational study.

Short Answer

Expert verified

The correct answer is option (a) a double-blind, completely randomized experiment, with the currently marketed medicine and the experimental medicine as the two treatments.

Step by step solution

01

Given information

To determine the design can be described from the given options.

02

Explanation

Patients with a certain blood illness are randomly assigned to one of two groups in a research trial.
In a double blind experiment, neither the subjects nor the people who measure them know which treatment they had, whereas in a single blind experiment, either the people who measure or the people who get the results know which treatment they got.
Patients were assigned to groups at random, and an experiment purposefully imposed some therapy on individuals in order to evaluate their responses, such that a completely randomized experiment using treatments from two categories of medicine.
As a result, the proper choice is option (a) a double-blind, completely randomized experiment, with the currently marketed medicine and the experimental medicine as the two treatments.

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Most popular questions from this chapter

A researcher from the University of California, San Diego, collected data on average per capita wine consumption and heart disease death rate in a random sample of 19 countries for which data were available. The following table displays the data

Is there convincing evidence of a negative linear relationship between wine consumption and heart disease deaths in the population of countries?

About 1100high school teachers attended a weeklong summer institute for teaching AP Statistics classes. After learning of the survey described in Exercise 56, the teachers in the AP Statistics class wondered whether the results of the tattoo survey would be similar for teachers. They designed a survey to find out. The class opted to take a random sample of 100teachers at the institute. One of the first decisions the class had to make was what kind of sampling method to use.

a. They knew that a simple random sample was the “preferred” method. With 1100teachers in 40different sessions, the class decided not to use an SRS. Give at least two reasons why you think they made this decision.

b. The AP Statistics class believed that there might be systematic differences in the proportions of teachers who had tattoos based on the subject areas that they taught. What sampling method would you recommend to account for this possibility? Explain a statistical advantage of this method over an SRS.

Exercises T12.4–T12.8 refer to the following setting. An old saying in golf is “You drive for show and you putt for dough.” The point is that good putting is more important than long driving for shooting low scores and hence winning money. To see if this is the case, data from a random sample of 69 of the nearly 1000 players on the PGA Tour’s world money list are examined. The average number of putts per hole (fewer is better) and the player’s total winnings for the previous season are recorded and a least-squares regression line was fitted to the data. Assume the conditions for inference about the slope are met. Here is computer output from the regression analysis:

T12.7 Which of the following is the 95% confidence interval for the slope β1 of the population regression line?
a. 7,897,179±3,023,782
b. 7,897,179±2.000(3,023,782)
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If P(A)=0.2and P(B)=0.52 and events A and B are independent, what is P(A or B)?

a. 0.1248

b. 0.28

c. 0.6352

d. 0.76

e. The answer cannot be determined from the given information.

Which of the following is a categorical variable?

a. The weight of an automobile

b. The time required to complete the Olympic marathon

c. The fuel efficiency (in miles per gallon) of a hybrid car

d. The brand of shampoo purchased by shoppers in a grocery store

e. The closing price of a particular stock on the New York Stock Exchange
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