I have a few multiple choice questions it would be great if you could help. Thanks

1) In experimental study the treatment group is:

a)are not treated with a placebo

b) is called the control group

c)are always in control of the other groups

d) they always represent 50% of the sample

2) if you examine the number of text messages sent in your class today throughout the school year. Which of the following applies?

a)this is a cross-sectional

b)this study is longitudinal

c)this study is latitudinal

d) this study is both longitudinal and cross-sectional

3) A teacher records the amount of time students spend using their phones in class today, this is an example of

a)experimental study

b)longitudinal study

c)latitudinal study

d)observation study