From a random sample of 7 students in an introductory finance class that uses? group-learning techni
From a random sample of 7 students in an introductory finance class that uses? group-learning techniques, the mean examination score was found to be7868 and the sample standard deviation was 25 For an independent random sample of8 students in another introductory finance class that does not use? group-learning techniques, the sample mean and standard deviation of exam scores were7121 and87 respectively Estimate with90?%confidence the difference between the two population mean? scores; do not assume equal population variances
The 90?% confidence interval is from a lower limit of to an upper limit of