Identify the type of problem most likely to occur with each of the sampling or experiment methods below: Placebo effect Nonresponse Undercoverage Response bias a) A particular group or groups are left out when collecting a sample from a population. b) A treatment is administered to all members of sample, and the results are observed and measured. c) A sample of people is randomly constructed from a government database and each sample member is mailed a survey and asked to complete and return it. d) A sample of people are contacted by phone and asked about if they have ever performed some illegal activity and if so how frequently.

the least common denominator is 40

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

step-by-step explanation:

step-by-step explanation:

its payment history because your score is mainly based on how consistent u are with your payment and if there on time. hope this : )