I GREATLY enjoyed Intuitive Biostatistics by Motulsky.
It assumes that you're not going to calculate any test statistic on your own, you're going to use Excel, R, or his own software. Therefore the book contains little to no formulas. Instead, it's plain English going over (biology's) most common tests and attributes, and explains what the test assumes about your data, what you can and cannot infer from the output, and what the pitfalls are. VERY useful if you like me come from a 'push X button no clue why' background.
It assumes that you're not going to calculate any test statistic on your own, you're going to use Excel, R, or his own software. Therefore the book contains little to no formulas. Instead, it's plain English going over (biology's) most common tests and attributes, and explains what the test assumes about your data, what you can and cannot infer from the output, and what the pitfalls are. VERY useful if you like me come from a 'push X button no clue why' background.