The mean of the 100 injected rats response times is 1.05 seconds, with a sample standard deviation of 0.5 seconds. Do you think that the drug has an effect on response time? So to do this, we're going to set up two hypotheses. We're going to say, the first hypothesis is, we're going to call it the null hypothesis, and that is that the drug has no effect on response time. And your null hypothesis is always going to be, you can view it as a status quo. You assume that whatever you're researching has no effect. So drug has no effect.