Question

> Researchers found 400 current smokers to volunteer for a study in which each was randomly assigned to one of three treatment groups Group 1 received an electronic cigarette (e-cig) in which each cartridge contained 72 mg of nicotine, Group 2 received an e-cig that contained 5.4 mg of nicotine, and Group 3 received an e-cig that contained no nicotine. The subjects did not know which group they were assigned. During the course of the intervention, subjects dropped out of the study. At the end of the study 71 subjects remained in Group 1,70 in Group 2, and 59 in Group 3. Results as to whether the subject quit smoking entirely are available below. Complete parts (a) through (g) Click here to see the results of the study (a) What type of experimental design was used in this study? A. A completely randomized design with three levels of treatment B. A matched-pairs design with two levels of treatment OC. This is an observational study, not a designed experiment OD. A completely randomized design with two levels of treatment (b) Researchers wanted to know whether electronic cigarettes may be used to help individuals abstain from cigarette smoking. What is the response variable? Is it qualitative or quantitative? The response variable is (c) To what population do the results of this study apply?

Answer 1

Solution:

(a) Option - A : A completely randomized design with three levels of treatment.

(b) quit or not quit is qualitative.

(c) current smokers.

(d) option - C

(e)

Goodness of Fit Test observed 72 70 71 213 expected 71.000 71.000 71.000 213.000 0-E (O - EP/E % of chisg 1.000 0.014 50.00 -1.000 0.014 50.00 0.000 0.000 0.001 0.000 0.028 100.00 .03 chi-square 2 df 9860 p-value The value of the chi-square test statistic is x) = 0.03. P-value = 0.9860. Since p-value (=0.9860) > a{=0.01), then do not reject the null hypothesis. The proportions are equal.