An experiment on the effect of caffeine on classmates' numeracy and heart rate
The purpose of this experiment is to master the basic process of T-test, a statistical method of measuring information, and to familiarize with the effect of caffeine on the students' calculation ability and heart rate, as well as to understand the general process of the double-blind method of experimentation.
Operation method
double-blind method
Materials and Instruments
students Move 1. Students receive their calculation paper and prepare for their calculations. Caveat 1. Participation is voluntary; those who are allergic to caffeine or do not want to participate may not drink, but must come to class and participate in the calculation. 2. The class president and members of the school committee will assist the teacher in serving the students (counting time, pouring water, stirring coffee, etc.). The class president will arrange for the students to bring three thermos flasks of boiling water (for coffee brewing, and disposable paper cups to be prepared by the lab). 3. Students attending this lab should avoid drinking any caffeinated beverages (coffee, coke, sprite, tea, etc.) for three days prior to the lab, otherwise the results will be affected. 4. Each student should bring a ballpoint pen or fountain pen with good writing skills and a calculator. For more product details, please visit Aladdin Scientific website.
Caffeine
Analytical balances Electronic calculators Chronographs Disposable paper cups Computers
2. The teacher will explain the precautions for the experiment.
(1) Calculation method is shown in (Figure 4-16): add two neighboring numbers and write the result (with one digit) on top of the two neighboring numbers.
(2) Each cycle lasts 15 minutes, and the procedure is as follows: first assemble; start counting at the third minute; count for one minute, rest for one minute, count three times, rest for three times; count the heart rate for 30 seconds at the ninth minute; and rest for five and a half minutes after that. 
(3) Recording of Calculation Speed and Heart Rate: Fill in three calculations of speed (in terms of the number of digits calculated) and one heart rate (30-second value multiplied by 2) for each cycle in the corresponding positions on the right side of the calculator. After all 6 cycles have been completed, calculate the average values of calculated speed and heart rate before and after drinking.
(4) Notes on calculation:
(1) Calculation starts when the signal is given; when time is up, stop the calculation immediately.
② After the experiment starts, make sure you do your best to do the calculations.
③The results of the calculations cannot be modified in the middle of the experiment; otherwise, they will be counted as errors in the statistics.
3. Practice 3 times for one minute each time and then take a break.
4. Start calculating formally:
(1) Calculate 3 cycles before drinking.
(2) Drinking coffee beverages.
(3) Calculate 3 more cycles after drinking the beverage.
5. Teacher reveals blindness.
6. Write in the upper left corner of the calculator: class, gender, cup number, whether the drink had any effect on the speed of calculation, and whether you are in the experimental group or the control group.
7. hand in the calculation sheet, disorganize it and return it to your classmates.
8. Each student counts the number of errors and the error rate of the other students. This can be done by one or more people (one person reads out the calculations and the other students check their own sheets, if there is a difference, one person must have made a mistake). Fill in the number of errors for each calculation and find the total number of errors before and after drinking. Then divide the total number of errors by the total number of places calculated to find the error rate before and after drinking.
9. Enter the data (speed, heart rate and error rate before and after drinking, total 6 data) of each student into the computer in the format shown in Table 4-5. 
10. Process the results of the experiment using the t-test (also observe the gender differences in the above indicators).
11. Analyze and discuss the results of the experiment and write a report on it.