Find mean and sd in Iris data set and draw graph
I need to find for every numeric variable in Iris data set mean and standard deviation by Species and draw that in ggplot2 graph with geom_col and geom_errorbar.
This is what I got so far
library(tidyverse) data(Iris) iris %>% group_by(Species) %>% summarise_if(is.numeric, list(mean = mean, sd = sd)) -> IrisData
I tried to create a graph but I don't know how to use the geom_errorbar
IrisData %>%
select(Species, ends_with("mean")) %>%
gather(key, val, 2:5) %>%
ggplot(aes(key, val, fill = Species)) +
geom_col()Homework Answers
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difference).
I need to calculate a 95% confidence interval. Based on this, I
came to the following formula: [Mean of the difference (D-mean) +/
t(alpha/2) * Sd / sqrt(n)]. I can fill in the following
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about. i am confused and i need help
Graphing Assignment 1: Representing the distribution of frequencies or values in a population Assignment Instructions 1. Read all of the background information about the data. 2. Read all of the tips about choosing what type of graph to draw. 3. Draw a graph that shows the distribution of tail length in a population of male...
Hi,
See the data set below.
Based on this, Excel comes with the following analysis (paired
difference).
I need to calculate a 95% confidence interval. Based on this, I
came to the following formula: [Mean of the difference (D-mean) +/
t(alpha/2) * Sd / sqrt(n)]. I can fill in the following
information:
D-mean = 27-34 = -7.
t(alpha/2) = 2,262
sqrt(n) = sqrt(10)
Do you now how I can find the standard deviation of the sample?
(Sd) I think it...
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