Plotting Normal Distributions

Description

Here, we will plot a normal distribution with mean 10 and standard deviation 2 from z-score -3.5 to z-score 3.5. To define our range of z-scores, we will use the sequence command to create a range of 200 points.

Sage Cell

Code

``````mean <- 10
sd <- 2
lower <- mean - 3.5 * sd
upper <- mean + 3.5 * sd
x <- seq(from=lower, to=upper, length.out=200)
plot(x=x, y=dnorm(x, mean=10, sd=2))```
```

Options

Plotting a Curve

We can plot a normal curve instead of a distribution by adding "l" to the plot command.

Code

``````mean <- 10
sd <- 2
lower <- mean - 3.5 * sd
upper <- mean + 3.5 * sd
x <- seq(from=lower, to=upper, length.out=200)
plot(x=x, y=dnorm(x, mean=10, sd=2), "l")```
```

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