1. If there are 50 observations in a sample, how many degrees of freedom are there? (The context here is for finding a t value when constructing a confidence interval or testing a hypothesis for the pupoulation mean)
2. If there are 39 observations then how many degrees of freedom are there for the t distribution (for a sample mean)
3. If there are 34 observations then how many degrees of freedom are there for the t distribution (for a sample mean)
4. If the sample size is 53 and the population standard deviation is 13.06 then the standard error is ? (Answer to two decimal places)