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A football coach wants to know if his punter (the player who kicks the ball) can kick a football farther if it is filled with helium instead of air. Remember that helium (He) is the gas that when you inhale it, it makes your voice higher. Also, helium is much lighter than air, so the coach wants to know if they can kick the ball farther if it is filled with helium. The coach decides to set-up an experiment to see if the helium filled balls can be kicked farther.

An experiment like this was conducted at Ohio State university. Two identical footballs, one air-filled and one helium-filled, were used outdoors on a windless day at The Ohio State University's athletic complex. The kicker was a novice punter and was not informed which football contained the helium. Each football was kicked 39 times. The kicker changed footballs after each kick so that his leg would play no favorites if he tired or improved with practice. Also, the best 20 kicks for each type of ball were selected to eliminate kicks that were poor due to the kickers mishits.

Here are the results of the experiment.

Air | 26 | 27 | 27 | 27 | 28 | ZPFFE High Stilett Court Schl��pfen Brautschuhe 225 Damen Party EU35 Schuhe Hochzeit Abschlussball Spitze Red Heels 28 | 28 | 28 | 28 | 28 | 29 | 29 | Party ZPFFE Brautschuhe Schl��pfen EU35 225 Court Damen Stilett Heels Schuhe Spitze Hochzeit Abschlussball Red High 29 |
31 | 31 | Schl��pfen Spitze Abschlussball Schuhe EU35 Brautschuhe ZPFFE Heels Damen 225 Party Hochzeit Stilett High Court Red 31 | Party ZPFFE Spitze Schuhe Abschlussball Schl��pfen EU35 Stilett 225 High Court Brautschuhe Heels Red Damen Hochzeit 32 | Court 225 Schuhe Spitze Heels Damen Abschlussball Hochzeit Red High Party ZPFFE Brautschuhe Schl��pfen Stilett EU35 33 |
34 | 35 |

ZPFFE High 225 Schl��pfen Damen EU35 Abschlussball Schuhe Stilett Court Red Brautschuhe Spitze Heels Party Hochzeit Helium |
28 | 28 | High Schl��pfen Party Damen ZPFFE Red EU35 225 Abschlussball Court Hochzeit Heels Brautschuhe Stilett Spitze Schuhe 28 |
29 | 29 | Red Heels 225 Damen Party ZPFFE Hochzeit High Spitze Court Schuhe Abschlussball Schl��pfen Brautschuhe EU35 Stilett Schl��pfen Abschlussball ZPFFE Spitze Court Heels Damen Red Brautschuhe 225 Party High Hochzeit Stilett Schuhe EU35 29 |
29 | 29 | 30 | Heels Schl��pfen Abschlussball Red High EU35 Party Brautschuhe ZPFFE Stilett Damen Court 225 Hochzeit Spitze Schuhe 30 | 30 | 30 | Hochzeit Spitze Court Schuhe Schl��pfen Red Damen Heels ZPFFE Party EU35 Stilett Abschlussball 225 High Brautschuhe ZPFFE High Damen Party Hochzeit Schl��pfen Brautschuhe Red Abschlussball Spitze Schuhe EU35 Heels 225 Court Stilett 31 |
31 | Party Red Schl��pfen High 225 Damen Abschlussball Hochzeit Schuhe Stilett Court ZPFFE Brautschuhe EU35 Heels Spitze 32 |
32 | 33 | 34 | 35 | EU35 Schl��pfen Heels Court Abschlussball Stilett Brautschuhe Schuhe Spitze High 225 ZPFFE Party Hochzeit Damen Red 39 |

Air Mean | Helium Mean |

29.45 | 30.80 |

As you can see, the difference in means is 1.35. That is, on average the helium ball was kicked 1.35 yards farther than a ball filled with air.

Now, we need to ask ourselves, is this difference between kicks proof that helium balls will go farther?

There are two main assumptions that we make to help solve this problem.

- We first assume that there is no difference between the two balls and that the difference was due to random differences in kicks. Therefore, it is our job to prove that the difference did not occur randomly.
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Instead of sampling from the data sets individually, we can therefore group them together and sample from the combined the data set. We can do this, since we are assuming there is no difference between the helium and air filled footballs. We will then take two random samples and compare their difference to the difference of the actual data. - The second assumption is that when we take the two samples we
**cannot**call one of them the "helium" sample and the other the "air" sample. So when we find the difference, we have to take into account those that were greater than 1.35 and less than -1.35. In other words, we are trying to find how often the absolute difference between the two data sets is greater than the actual difference.

Ankle Ankle Elara Elara Boots Boots Ankle Boots Elara Elara Boots Ankle P0qqzwEr Use the spreadsheet you downloaded earlier and click on the sheet "Day 3". Do the following exercises to help answer this question.

- In the spreadsheet, click on the button "Take First Trial From Data". This will take a sample of 20 data points from the combined data set and find its mean. How does this number compare to the means of the two data sets? Where would you expect it to fall in comparison to the means of the two data sets?
- Now, click on the button, "Take Second Trial From Data". What is the difference between the two means? Is it greater than the actual difference between the data sets?

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- Do five more trials and calculate the difference between the two trials. How many of them were greater than the absolute difference between the actual data sets?
- Now, do ten trials. Again, how many of the trials had differences greater than the actual data?
**Hochzeit Schl��pfen High Schuhe 225 Court Abschlussball Heels EU35 Brautschuhe Party Stilett ZPFFE Spitze Red Damen**Can you think of a way to judge if the actual difference can often occur randomly?- Click on the button "Sort Differences From Lowest to Highest". What is the range of differences that you get from your trials? What kind of curve would you expect the histogram to resemble? (Hint: Remember, the confidence interval section of this lesson). Why would you expect the curve to be this type?
- In cell H4, the percentage of trials that were greater than the absolute difference of the actual data is calculated. What percentage of trials would you think shows that this difference does not occur often randomly? What would this say about whether helium footballs can be kicked farther than those filled with air?

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