LS15 MIDTERM - UCLA Phelan
2025/2026 Exam Questions and Answers
| 100% Solved
1. Scientific thinking, what is it for? and be able to use it - 🧠 ANSWER ✔✔
scientific thinking - 🧠 ANSWER ✔✔- empirical (based on observations and
experiences not solely logic)
- self correcting
- observation
- hypotheses
- predictions
- experiments
- conclusions (modify hypotheses, and continue the process)
,scientific method - 🧠 ANSWER ✔✔- organized
- empirical
- methodical
- structured way of finding information about observable events in nature
- lets us reject hypotheses about how the world works
steps of the scientific method - 🧠 ANSWER ✔✔1. make observations
2. formulate hypotheses - is it testable? refutable?
3. make a prediction
4. conduct an experiment - control all variables BUT one, randomized,
double blind
5. analyze results, draw a conclusion (if evidence disproves hypothesis,
construct a new hypothesis)
6. report results
is the scientific method flexible? - 🧠 ANSWER ✔✔yes! it doesn't have to be
step by step
,what does a "critical experiment" do - 🧠 ANSWER ✔✔put a hypothesis to
the test, the results can decisively determine whether a hypothesis is
correct
class examples of scientific method - 🧠 ANSWER ✔✔- does it rain more on
weekends?
- real vs artificial vanilla
- "maze bright" vs "maze dull" rats
class example: does it rain more on weekends? - 🧠 ANSWER ✔✔- find
average Monday and Saturday rainfall; rains 22% more on Saturdays
- hypothesis: particular matter from car exhaust builds up during the week
leading to cloud formation and then rain on the weekends
- experiment: collect data from somewhere with no cars (ocean)
- results: there is equal rainfall on each day in the ocean, PROVING that
car exhaust affects the trend of more rain on weekends
class example: real vs artificial vanilla in chocolate chip cookies - 🧠
ANSWER ✔✔- Phelan baked batches of cookies with real vanilla and with
artificial vanilla
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, - asked wife which one tasted better
- concluded that there was no difference in taste between the types of
vanilla used
class example: is maze running genetic in mice? - 🧠 ANSWER ✔✔- have
"maze dull" and "maze bright" mice
- with each generation, test all mice for maze learning ability and breed only
the top 20% and bottom 20%
- observe new generations
- conclusion: over time, the extremes got more and more exaggerated
- maze running is not genetic but the allele for fear is in mice; less fear =
solve maze quicker, more fear = solve maze slower
how to increase experiment's power - 🧠 ANSWER ✔✔- randomize subjects
- control your study
- use a double-blind design
R.C.D. - rat's cause diseases
2025/2026 Exam Questions and Answers
| 100% Solved
1. Scientific thinking, what is it for? and be able to use it - 🧠 ANSWER ✔✔
scientific thinking - 🧠 ANSWER ✔✔- empirical (based on observations and
experiences not solely logic)
- self correcting
- observation
- hypotheses
- predictions
- experiments
- conclusions (modify hypotheses, and continue the process)
,scientific method - 🧠 ANSWER ✔✔- organized
- empirical
- methodical
- structured way of finding information about observable events in nature
- lets us reject hypotheses about how the world works
steps of the scientific method - 🧠 ANSWER ✔✔1. make observations
2. formulate hypotheses - is it testable? refutable?
3. make a prediction
4. conduct an experiment - control all variables BUT one, randomized,
double blind
5. analyze results, draw a conclusion (if evidence disproves hypothesis,
construct a new hypothesis)
6. report results
is the scientific method flexible? - 🧠 ANSWER ✔✔yes! it doesn't have to be
step by step
,what does a "critical experiment" do - 🧠 ANSWER ✔✔put a hypothesis to
the test, the results can decisively determine whether a hypothesis is
correct
class examples of scientific method - 🧠 ANSWER ✔✔- does it rain more on
weekends?
- real vs artificial vanilla
- "maze bright" vs "maze dull" rats
class example: does it rain more on weekends? - 🧠 ANSWER ✔✔- find
average Monday and Saturday rainfall; rains 22% more on Saturdays
- hypothesis: particular matter from car exhaust builds up during the week
leading to cloud formation and then rain on the weekends
- experiment: collect data from somewhere with no cars (ocean)
- results: there is equal rainfall on each day in the ocean, PROVING that
car exhaust affects the trend of more rain on weekends
class example: real vs artificial vanilla in chocolate chip cookies - 🧠
ANSWER ✔✔- Phelan baked batches of cookies with real vanilla and with
artificial vanilla
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, - asked wife which one tasted better
- concluded that there was no difference in taste between the types of
vanilla used
class example: is maze running genetic in mice? - 🧠 ANSWER ✔✔- have
"maze dull" and "maze bright" mice
- with each generation, test all mice for maze learning ability and breed only
the top 20% and bottom 20%
- observe new generations
- conclusion: over time, the extremes got more and more exaggerated
- maze running is not genetic but the allele for fear is in mice; less fear =
solve maze quicker, more fear = solve maze slower
how to increase experiment's power - 🧠 ANSWER ✔✔- randomize subjects
- control your study
- use a double-blind design
R.C.D. - rat's cause diseases
