The t-distribution, like the normal distribution, is bell-shaped and symmetric, but it has heavier tails, which means that it tends to produce values that fall far from its mean. T-tests are used ...

When p = 0.5, the distribution is symmetric around the mean, such as when flipping a coin, because the chances of getting heads or tails are 50%, or 0.5. When p > 0.5, the distribution curve is ...