a study took a group of adults and randomly divided them into two groups. one group was told to drink tea every night for a week, while the other group was told not to drink tea that week. researchers then compared when each group fell asleep. which type of study is this? explain. best description of study would be: select an answer identify if each explanation below is good enough to earn full credit as an explanation of the type of study you selected above. \because it says it was random.\ \because they observed when the people fell asleep.\
esearchers assigned one group who drank tea and one group that did not.\ if asked to go into more details about the study above, here are some vocabulary words that might be used. some of these words are not appropriate for this type of study! if the vocabulary word does not describe this type of study, select
ot applicable.\ - is this study retrospective? select an answer - identify the control group. select an answer - identify the treatment group. select an answer - identify the placebo. select an answer for a different survey, volunteers survey all the women wearing dresses at a wedding convention. is this sample representative of the people at the event? no, its only going to sample women, and there might be men at the conference. yes, some people will be in wedding dresses, so its a sample. yes, its a wedding convention, so most people will show up in wedding dresses. no, not very many people will show up in a wedding dress, so its definitely not going to represent all people at the event.

Question

Accepted Answer

### Part 1: Type of Study
# Brief Explanations:
This is an experimental study. In an experiment, researchers manipulate an independent variable (here, tea consumption: one group drinks tea, the other doesn't) and randomly assign participants to groups to observe the effect on a dependent variable (time to fall asleep). The key is the manipulation of the independent variable and random assignment.
# Answer:
Experimental Study (because researchers assigned groups to drink tea or not (manipulated the variable) and randomly divided them, then observed the outcome (sleep time)).

### Part 2: Explanation Validity
1. "Because it says it was random."
# Brief Explanations:
Random assignment is part of an experiment, but this explanation is too vague. It doesn't mention the manipulation of the variable (tea drinking) or the observation of the outcome. So it's not sufficient for full credit.
# Answer:
Not good enough (lacks mention of variable manipulation and outcome observation).

2. "Because they observed when the people fell asleep."
# Brief Explanations:
Observation is part of many studies, but this doesn't mention the experimental manipulation (assigning tea groups) or randomization. Just observing isn't enough to define an experiment. So not sufficient.
# Answer:
Not good enough (doesn't mention experimental manipulation or random assignment).

3. "Researchers assigned one group who drank tea and one group that did not."
# Brief Explanations:
This mentions the key experimental action: assigning groups to different conditions (tea or no tea), which is central to an experiment. Along with random division (from the study description), this explains the experimental nature. So it's a good explanation.
# Answer:
Good enough (mentions the core experimental manipulation of assigning groups to different conditions).

### Part 3: Vocabulary Application
- **Is this study retrospective?**
# Brief Explanations:
A retrospective study looks at past events. This study is experimental (prospective: manipulates a variable and follows groups forward), so it's not retrospective.
# Answer:
Not applicable (study is experimental, not retrospective as it manipulates a variable and observes forward, not looking at past data).

- **Identify the control group.**
# Brief Explanations:
The control group is the group not receiving the treatment (tea). Here, the group told not to drink tea is the control, as they serve as a baseline to compare with the treatment group (tea drinkers).
# Answer:
The group told not to drink tea.

- **Identify the treatment group.**
# Brief Explanations:
The treatment group is the group receiving the treatment (tea). Here, the group told to drink tea every night is the treatment group, as they are exposed to the variable (tea) being tested.
# Answer:
The group told to drink tea every night.

- **Identify the placebo.**
# Brief Explanations:
A placebo is a fake treatment (e.g., a non - tea drink that looks like tea) to control for psychological effects. In this study, there's no mention of a placebo (the non - tea group just doesn't drink tea, not a fake tea). So it's not applicable.
# Answer:
Not applicable (no placebo is used; the control group just doesn't drink tea, not a fake treatment).

### Part 4: Sample Representativeness
# Brief Explanations:
A representative sample should reflect the whole population (people at the wedding convention). The sample only includes women wearing dresses. The convention likely has men, women not in dresses, etc. So it's not representative as it excludes men and women not in dresses. The first option correctly points out it only samples women (missing men) and there might be men at the conference. The other options are wrong: the second ignores the exclusion of men/non - dress - wearing women; the third assumes most are in wedding dresses (not necessarily true, and still ignores men); the fourth is wrong as the issue is exclusion of groups, not the number in wedding dresses.
# Answer:
No, it’s only going to sample women, and there might be men at the conference.

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QUESTION IMAGE

Question

Explanation:

Part 1: Type of Study

Answer:

Part 2: Explanation Validity