Questions from Statistics

Q: The subjects do not know whether they are given aspirin or a

The subjects do not know whether they are given aspirin or a placebo, and the evaluators who measure the pulse rates also do not know. This trial is: (a) Single-blind; (b) Double-blind; (c) Not blinde...

Q: The purpose of the placebo is: (a) To

The purpose of the placebo is: (a) To prevent participants from knowing whether they belong to the treatment group or the control group; (b) To distinguish between the cases and the controls in a case...

Q: If we see a placebo effect, it means: (

If we see a placebo effect, it means: (a) The experiment was not really double-blind; (b) The experimental groups were too small; (c) Pulse rates were lowered among some of those in the placebo group....

Q: In a Gallup poll of 1018 adults, it was found that

In a Gallup poll of 1018 adults, it was found that 22% smoked cigarettes in the past week.

Q: Figure 3.36 on the next page depicts the annual high

Figure 3.36 on the next page depicts the annual high values of the Dow Jones Industrial Average (DJIA) for stocks. How is this graph misleading? How could it be drawn so that it is not misleading? In...

Q: The Nielsen Company installs devices in homes to record the TV shows

The Nielsen Company installs devices in homes to record the TV shows that are watched. The results are then used to provide ratings identifying which shows are being viewed more than others.

Q: If all subjects in the aspirin treatment group are athletes and all

If all subjects in the aspirin treatment group are athletes and all subjects in the control group are not athletes, then there is a danger of which of the following: (a) Samples those are too small; (...

Q: In a Marist Poll, respondents chose the most annoying phrases used

In a Marist Poll, respondents chose the most annoying phrases used in conversation. Among the 864 subjects who were surveyed, 51% chose “whatever.” The survey has a margin of error of 3 percentage poi...

Q: From the poll results given in Exercise 11, can we safely

From the poll results given in Exercise 11, can we safely conclude that the majority of people are most annoyed by the use of “whatever” in conversation?

Q: Consider a study in which you measure the weights of dolphins.

Consider a study in which you measure the weights of dolphins. The variable of interest in this study is: (a) The size of the sample; (b) The weights of dolphins; (c) The average (mean) weight of all...