I2S chapter 9 qnaire

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1. Can changing diet reduce high blood pressure? Vegetarian diets and low-salt diets are both promising. Men with high blood pressure are assigned at random to four diets [details omitted]. The 240 subjects are label 001 to 240. Software assigns an SRS of 60 subjects to diet 1, an SRS of 60 of the remaining 180 to diet 2, and an SRS of 60 of the remaining 120 to diet 3. The 60 who are left get diet 4. This is a
A. completely randomised design	10%
B. block design, with four blocks	10%
C. matched pairs design	10%
2. How confident are you about your response to the previous question?
A. very confident	10%
B. quite confident	10%
C. neutral	10%
D. quite unconfident	10%
E. very unconfident	10%
3. The Community Intervention Trial for Smoking Cessation asked whether a community-wide advertising campaign would reduce smoking. The researchers located 11 pairs of communities, each pair similar in location, size, economic status, and so on. One community in each pair participated in the advertising campaign and the other did not. This is
A. an observational study	10%
B. a matched pairs experiment	10%
C. a completely randomised experiment	10%
4. How confident are you about your response to the previous question?
A. very confident	10%
B. quite confident	10%
C. neutral	10%
D. quite unconfident	10%
E. very unconfident	10%