An independent random sample is selected from an approximately normal population with unknown standard deviation. Find the degrees of freedom and the critical tvalue (t*) for the given sample size and condence level. (a) n = 9, CL = 90% degrees of freedom critical value (b) n = 23, CL = 98% degrees of freedom critical value (c) n = 37, CL = 95% degrees of freedom critical value (d) n = 14, CL = 99% degrees of freedom critical value You may need to use the appropriate appendix table or technology to answer this question. 1