Question 1 A random sample of 20 items is selected from a population. To determine the appropriate t-value what number of degrees of freedom should be used?20192125.5 points Question 2 A federal bank examiner is interested in estimating the mean outstanding defaulted loans balance of all defaulted loans over the last three years. A random sample of 20 defaulted loans yielded a mean of $67,918 with a standard deviation of $16,552.40. Calculate a 90% confidence interval for the mean balance of defaulted loans over the past three years. Round your answer to the next whole number[66,487 69,349][39,299 96,537][57,329 78,507][61,829 74,007][61,519 74,317].5 points Question 3 A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spent studying per week. They sampled 240 students and found a mean of 22.3 hours per week. Assuming a population standard deviation of 6 hours, what is the 99% level of confidence?