In order to investigate whether women are more likely than men to prefer Democratic candidates, a political scientist selects a large sample of registered voters, both men and women. She asks every voter whether they voted for the Republican or the Democratic candidate in the last election. This is

a).observational study
b)a random experiment.
c)A block design experiment.
d)None of the above.

a) observational study

Step-by-step explanation:

In observational study a researcher don't impose a treatment to influence the outcome. In other words, a researcher only observe the outcome of the study without influencing it is known as observation study.

In the given scenario,  political scientist only asks voters from both gender about their voting preferences in order to investigate whether women are more likely than men to prefer Democratic candidates. So, a political scientist is not influencing the outcome and only observing the outcome of the study and thus, it indicates that the given study is an observational study.    

step-by-step explanation:

i am not sure sorry : c

3< x< 5

step-by-step explanation:

|x - 4| < 1

there are two solutions, one positive and one negative.   remember to flip the inequality when taking the negative solution

x-4 < 1       x-4 > -1

add 4 to each side

x-4+4 < 1+4       x-4+4 > -1+4

x< 5                 x> 3

3< x< 5