Question

Construct 95% confidence interval for the following gas levels

20, 170, 25, 15, 4, 12.5, 20, 15, 20

Check asumptions to find the best way to construct the confidence interval.

Determine if the population mean of the gas level is less than 80

*Please note that this questions must be solved in R, and explanations would be greatly appreciated :) *

Answer 1

Here we want to Ho :u= 80 Vs Hi Cu<80 > x=c(20, 170, 25, 15, 4, 12.5, 20, 15, 20) t. test (x, mu=80, conf.level=0.95, alternative="less") output: One sample t-test data : x t=-2.7069, df = 8, p-value=0.01334 alternative hypothesis: true mean is less than so 95 percent confidence interual. - Inf 65.4405 Sample Estimates : mean of 33.5 Thank you, If you are satished, then like me.