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Bouncing squash balls

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Keywords:
sport, pressure, temperature
Categories:

science, sport;
one- and two-sample data, designed experiments

Description:

The data give the heights that squashballs bounce after being dropped from 1.5 metres. The bounce height is first measured at room temperature. The ball is then submerged into boiling water for 30 seconds, and dropped again from 1.5 metres. The balls to first undergo the room temperature drop or heated drop at random. The squash balls were all double yellow dot balls (extra super slow, or very low bounce).

There are 20 observations on two variables (plus an indentifier).

Variables:
Ball An indentifier: the ball number
Ht.Room The height (in centimetres) the ball bounces at room temperature after being dropped from 1.5 metres.
Ht.Hot The height (in centimetres) the ball bounces at after being submerged in boiling water for 20 seconds after being dropped from 1.5 metres.
Data Quality:

There are no missing values.

Source:

A student project in Data Analysis at USQ in semester 1, 2007, by Lisa Fritz.

Notes:

There must be some skeptism about measuring the bounce-heights to 0.5mm.

References: