var_interval: Analyze the variance from a dataset using the chi**2...
In jrminter/statshelpR: Convenience functions for statistical analysis

Description Usage Arguments Value Examples

This was developed from [eda358.r](https://www.itl.nist.gov/div898/handbook/eda/section3/eda358.r) I modified the function to return a dataframe. The user can print the dataframe or use functions like kable to output a table in a Rmarkdown document. The original function supplied a default 95 95

1	var_interval(data, sigma0, conf_level = 0.95)

`data`	A vector of data values (real number)
`sigma0`	The target standard deviation
`conf_level`	The desired confidence level (0.95)

A dataframe with results

library(statshelpR)
# Data from Example 16 page 334 Larsen: Thicknesses of washers
# (in cm) of 15 randomly selected washers are listed below. The
# 95% confidence interval. The variation is supposed to be within 
# 0.002 cm. Are the washers acceptable?

dat <- c(0.422, 0.424, 0.424, 0.430, 0.419,
         0.424, 0.420, 0.424, 0.425, 0.425,
         0.423, 0.431, 0.437, 0.422, 0.434)

df <- var_interval(dat, 0.002, 0.95)
print(df)