The theoretical orientation that insisted on verifiability of observation was

You cannot fire a gun softly or flush a toilet halfway. Like an action potential, gunfire and a toilet's flush follow the ___ law.

a) on-or-off b) all-or-none c) this-or-that d) is-or-isn't

And direction of the effect can be measured is known as ________. A statistical procedure for combining the results of several studies so the strength, consistency,

a. the box score method d. the hunt-and-pick method c. the relevance technique b. a meta-analysis