# Hypothesis testing is vital to test patient outcomes.

It will help me gain confidence with conducting data analysis using R. I have tried a few R MOOCs in the past which helped me start out using R but I had not found a comprehensive intro to R that I could use more broadly - this course really succeeds with accomplishing that.

## Andreas Cellarius hypothesis, showing the planetary motions.

### Next section: to Inferential statistics (testing hypotheses)

Next, you’ll need to **state the null hypothesis** (See: ). That’s what will happen if the researcher is *wrong*. In the above example, if the researcher is wrong then the recovery time is less than or equal to 8.2 weeks. In math, that’s:

H_{0} μ ≤ 8.2

### A good hypothesis statement should:

Ten or so years ago, we believed that there were 9 planets in the solar system. Pluto was demoted as a planet in 2006. The null hypothesis of “Pluto is a planet” was replaced by “Pluto is not a planet.” Of course, rejecting the null hypothesis isn’t always that easy — the hard part is usually figuring out what your null hypothesis is in the first place.

## Hypothesis testing - Handbook of Biological Statistics

Here are three experiments to illustrate when the different approaches to statistics are appropriate. In the first experiment, you are testing a plant extract on rabbits to see if it will lower their blood pressure. You already know that the plant extract is a diuretic (makes the rabbits pee more) and you already know that diuretics tend to lower blood pressure, so you think there's a good chance it will work. If it does work, you'll do more low-cost animal tests on it before you do expensive, potentially risky human trials. Your prior expectation is that the null hypothesis (that the plant extract has no effect) has a good chance of being false, and the cost of a false positive is fairly low. So you should do frequentist hypothesis testing, with a significance level of 0.05.

## Hypothesis testing and p-values (video) | Khan Academy

This is quite simple and is just achieved in a sentence. For this question, we could say something along the lines:

The variable of interest is the score obtained on the standardised test taken in the room with floral scent.