### Instructions for Optimism/Pessimism Survey

In this experiment you are asked to choose between gambles. Each gamble
consists of a container (an urn) containing red and white marbles. There are always
100 marbles, but the percentage of red and white may differ from gamble to gamble.
One marble will be chosen randomly and blindly from the chosen urn, and if
the marble is red, you win $100,
but if the marble is white you get $0 (nothing). It is in your
best interest to choose the urn with the greater percentage of red marbles.
For urn A, you will always be given the exact percentage of red marbles. For urn B, you
will receive advice from someone who wants to help you who has estimated the percentage of
red marbles in urn B. There are two sources,

The *optimist* tends to overestimate
the number of winning (red) marbles.
The *pessimist* tends to underestimate the
number of winning (red) marbles in the urn.

These people are trying to help you, but they do not know the
exact percentages; they make their estimates by shaking the jar, looking through the clear
glass, and estimating the percentage by eye.

In each case you decide whether you would rather choose urn A, which has a known percentage of
red marbles or from urn B, about which you have estimates of the percentage of winning (red) marbles.

#### Warmup Trials