identifying variables
spongebob squarepants, mr. krabs, and some of the characters from the simpsons have been busy doing a little research. read the description for each experiment and answer the questions.
mr. krabs created a secret ingredient for a breath mint that he thinks will “cure” the bad breath people get from eating crabby patties at the krusty krab. he asked 100 customers with a history of bad breath to try his new breath mint. he had fifty customers (group a) eat a breath mint after they finished eating a crabby patty. the other fifty (group b) also received a breath mint after they finished the sandwich, however, it was just a regular breath mint and did not have the secret ingredient. both groups were told that they were getting the breath mint that would cure their bad breath. two hours after eating the crabby patties, thirty customers in group a and ten customers in group b reported having better breath than they normally had after eating crabby patties.
1. which people are in the control group?
2. what is the independent variable?
3. what is the dependent variable?
4. what are some control variables?
5. what should mr. krabs’ conclusion be?
6. why do you think 10 people in group b reported fresher breath?

Question

Accepted Answer

### Question 1: Which people are in the control group?
# Brief Explanations:
In an experiment, the control group is the one that does not receive the experimental treatment (the independent variable) so that it can be compared to the experimental group. Here, Group B received a regular breath mint (not the secret ingredient), while Group A received the breath mint with the secret ingredient. So Group B is the control group as they didn't get the experimental (secret ingredient) treatment.
# Answer:
Group B (the fifty customers who received a regular breath mint and did not have the secret ingredient)

### Question 2: What is the independent variable?
# Brief Explanations:
The independent variable is the factor that is manipulated or changed in an experiment to observe its effect on the dependent variable. In this experiment, Mr. Krabs is testing the effect of a secret ingredient in the breath mint. So the independent variable is the presence or absence of the secret ingredient in the breath mint (or the type of breath mint: with secret ingredient vs. regular).
# Answer:
The presence of the secret ingredient in the breath mint (or the type of breath mint: breath mint with secret ingredient vs. regular breath mint)

### Question 3: What is the dependent variable?
# Brief Explanations:
The dependent variable is the factor that is measured or observed to see the effect of the independent variable. Here, the outcome being measured is the breath freshness (or the reported breath quality) of the customers after eating the crabby patties and using the breath mint. So the dependent variable is the breath freshness (or the level of bad breath/cured breath reported by customers).
# Answer:
Breath freshness (or the reported breath quality/bad breath cure) of the customers

### Question 4: What are some control variables?
# Brief Explanations:
Control variables are factors that are kept constant to ensure that the experiment is fair and that the effect of the independent variable on the dependent variable can be accurately measured. Some control variables here could be: the type of crabby patties (all customers eat the same crabby patties), the time after eating the patties when breath is checked (two hours for both groups), the number of customers in each group (initially 50, though some dropped out, but the initial setup), the fact that all customers had a history of bad breath (so the starting condition is similar), and the same environment/setting for eating the patties and using the mints.
# Answer:
- Type of crabby patties (all eat the same)
- Time after eating (two hours for breath check)
- Initial number of customers (50 in each group initially)
- Customers' history of bad breath (all had bad breath history)
- Same environment for eating/using mints

### Question 5: What should Mr. Krabs’ conclusion be?
# Brief Explanations:
To draw a conclusion, we compare the results of the experimental group (Group A, with secret ingredient) and the control group (Group B, regular mint). Group B (30 customers) and Group A (10 customers) reported better breath? Wait, no—wait the data: "thirty customers in Group A and ten customers in Group B reported having better breath than they normally had after eating crabby patties." Wait, wait, let's re-read: "thirty customers in Group A and ten customers in Group B reported having better breath than they normally had after eating crabby patties." Wait, so more people in Group A (experimental, secret ingredient) reported better breath? Wait no—wait the problem says: "Group B reported having better breath than they normally had after eating crabby patties." Wait, no, the text: "thirty customers in Group A and ten customers in Group B reported having better breath than they normally had after eating crabby patties." Wait, so Group A (secret ingredient) had 30, Group B (regular) had 10. Wait, no, maybe I misread. Wait the original: "He had fifty customers (Group A) eat a breath mint after they finished eating a crabby patty. The other fifty (Group B) also received a breath mint after they finished the sandwich, however, it was just a regular breath mint and did not have the secret ingredient. Both groups were told that they were getting the breath mint that would cure their bad breath. Two hours after eating the crabby patties, thirty customers in Group A and ten customers in Group B reported having better breath than they normally had after eating crabby patties."

So Group A (secret ingredient) had 30 out of 50 with better breath, Group B (regular) had 10 out of 50. So the secret ingredient breath mint (Group A) had more people with better breath. Therefore, Mr. Krabs can conclude that the secret ingredient in the breath mint is effective in improving breath freshness (since more people in Group A reported better breath than in Group B).
# Answer:
The secret ingredient in the breath mint is effective in improving breath freshness, as more customers (30 out of 50) in Group A (with secret ingredient) reported better breath compared to Group B (10 out of 50) with the regular breath mint.

### Question 6: Why do you think 10 people in group B reported fresher breath?
# Brief Explanations:
There could be several reasons. The placebo effect: since both groups were told the mint would cure bad breath, some in Group B (control) might have perceived their breath as better due to the belief (placebo effect). Also, maybe the regular breath mint has some mild effect on breath, or individual differences in how their bodies react to the regular mint, or maybe some other factors like they ate the crabby patties differently, but the main reason is likely the placebo effect (psychological belief that the mint works) or the regular mint having a slight effect.
# Answer:
Possible reasons include the placebo effect (they believed the mint would work, so perceived better breath), the regular breath mint having a mild breath - freshening effect, or individual differences in how their bodies responded to the regular mint or the crabby patties.

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QUESTION IMAGE

Question

Explanation:

Question 1: Which people are in the control group?

Answer:

Question 2: What is the independent variable?