Hi all I'm confused on calculating a test statistic. I am doing "hypothesis testing using t-scores" and my sample size is 100, sample mean 24.6, sample std. dev. 7.25. I have to decide if the population mean is significantly greater than 23 at the 0.05 level. If my df=100-1=99, do I use the df in my Student t chart with the infinity symbol? I guess I am confused because there is a df listing for 120, but not 100.