TITLE>Helium football Datafile</TITLE>

<B><DT>Reference:</B>   Lafferty, M. B. (1993), "OSU scientists get a kick out of sports controversy, <I>"The Columbus Dispatch </I> (November, 21, 1993).

<B><DT>Description:</B>   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.   Each football was kicked 39 times
and the two footballs were alternated with each kick.  The experimenter
recorded the distance traveled by each ball. 
<B><DT>Number of cases:</B>   39
<B><DT>Variable Names:</B>
<OL>
<LI>Trial:   Trial Number
<LI>Air:   distance in yards for air-filled football
<LI>Helium: distance in yards for helium-filled football
</OL>

<B><DT>The Data:</B>
<PRE>
Trial   Air     Helium
1       25      25
2       23      16
3       18      25
4       16      14
5       35      23
6       15      29
7       26      25
8       24      26
9       24      22
10      28      26
11      25      12
12      19      28
13      27      28
14      25      31
15      34      22
16      26      29
17      20      23
18      22      26
19      33      35
20      29      24
21      31      31
22      27      34
23      22      39
24      29      32
25      28      14
26      29      28
27      22      30
28      31      27
29      25      33
30      20      11
31      27      26
32      26      32
33      28      30
34      32      29
35      28      30
36      25      29
37      31      29
38      28      30
39      28      26

</PRE>


<p>
1) Is there a difference in distance between the helium and the air
football? 

<p> <br> 2) Is there evidence that the kicker improved with practice? If
so, would that affect your conclusions?

<p> <br> 3) Can you identify outlying measurement which may be the
result of flubbed kicks? If so, are these affecting your conclusions?