Aresearcher is studying the relationship between stress and diet among college students. the researcher recruits students by sending out an e-mail blast, and then includes in the sample the first 100 male and 100 female students who volunteer to participate. what type of sampling did the researcher use? a. snowball samplingb. stratified samplingc. quota samplingd. convenience sampling

(C) Quota sampling

Explanation:

The quota sampling is one of the type of sampling method, which is used for representing the various types of data from the group.

The quota sampling is one of the effective sampling as it basically allow to investigate the characteristics of the sample by using some ideal techniques by the researcher.    

The quota sampling is the same as the sampling of convenience but there is an exceptional case is that a researchers basically recruits from the distinct population.

Therefore, Option (C) is correct.  

a. formula: f=ma or f/m=a

10,000n/1,267kg≈7.9m/

b. formula: a= and s=d/t

speed= 394.6/15

s=26.3m/s

a=

a=1.75m/

c. 7.9-1.75=difference of 6.15m/

d. the force that most likely caused this difference is friction forces