Identify the kind of correlation appropriate for use in solving each of the following problems. To find the relationship between gender and watching a specific TV program or another in the same time slot.
a. Pearson's r c. phi coefficient
b. Spearman rho
Question 2
Identify the major threat to internal validity in the following research studies. Students who had low scores on a reading pretest were chosen for a special instructional program. This group showed significant gains on a reading achievement test administered after a period of four months.
a. Regression
b. Diffusion
c. Mortality
d. Selection
e. History
Pulmonary function test: spirometry. (a) Normal respiratory volumes, as measured during spirometry.
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