### Purpose

The purpose of this project is to determine whether taking caffeine affects typing speed.

### Hypothesis

Typing speed is not affected by whether or not you take caffeine. (Remember: You cannot scientifically *prove* a hypothesis, however, you can disprove one.)

### Experiment Summary

You are going to type the same text repeatedly for a specified length of time and compare how many words you typed before ingesting caffeine and afterward.

### Materials

- computer
- a drink containing caffeine and another drink of the same type that does not contain caffeine (e.g., coffee and decaf coffee, diet cola and decaf diet cola)
- stopwatch or timer

### Experimental Procedure

- Drink the non-caffeinated beverage. Wait 30 minutes.
- Type "The quick brown fox jumped over the lazy dog." as many times as you can for 2 minutes. If you can, type using a word processing program that keeps track of how many words you have entered.
- Drink the caffeinated beverage. Wait 30 minutes. (The peak effects from taking caffeine tend to be felt around 30-45 minutes after taking it.)
- Type "The quick brown fox jumped over the lazy dog." as many times as you can for 2 minutes.
- Compare the number of words you typed. Calculate words per minute by dividing the total number of words that were typed by the number of minutes (e.g., 120 words in 2 minutes would be 60 words per minute).
- Repeat the experiment, preferably a total of at least three times.

Data

- Construct a table stating the type of drink and the number of words you could type in 2 minutes.
- Calculate your average typing speed (words per minute) for each drink.

### Results

Did taking caffeine affect how quickly you could type? If it did, did you type more or fewer words under the influence of caffeine?

### Conclusions

- Was your hypothesis accepted or rejected? Can you propose an explanation for the outcome?
- Do you think you would get the same results if you had tested the effects of the caffeinated beverage first? Caffeine stays in your system for a few hours. When it wears off, some people report feeling "crashed" instead of normal.
- How do you think the results would be affected by changing the amount of caffeine? What do you think would happen if you took too much caffeine?
- Do you think you became better at typing the test sentence over time?
- If your word processor can track typing errors, did you note any difference in the accuracy of your typing after drinking the caffeinated beverage? Could you propose a hypothesis about the effect of caffeine use on typing accuracy?

### Things to Think About

- Caffeine occurs naturally in over 50 different types of plants, including coffee beans, tea leaves, cocoa beans, and kola nuts.
- Caffeine acts as a mild stimulant. Some studies have shown that taking caffeine may temporarily increase concentration, reasoning, and memory. However, the effects of caffeine wear off after a few hours and if you routinely take caffeine you will need to take more to get the same effect.

- Most adults are exposed to caffeine in coffee and energy drinks. Children are likely to get caffeine from energy drinks, soft drinks, tea, and chocolate.

### Amount of Caffeine in Common Products

Product | Caffeine (mg) |

coffee (8 oz) | 65 - 120 |

Red Bull (8.2 oz) | 80 |

tea (8 oz) | 20 - 90 |

cola (8 oz) | 20 - 40 |

dark chocolate (1 oz) | 5 - 40 |

milk chocolate (1 oz) | 1 - 15 |

chocolate milk (8 oz) | 2 - 7 |

decaf coffee (8 oz) | 2 - 4 |