Previous Problem Problem List Next Problem (1 point) Credit scores are used by banks, financial institutions, and retailers to determine one's trustworthiness, and their ability to pay their credit card, when he/she is given a credit card. The higher the credit score, the better the credit (and the more financially trustworthy) a consumer is. In light of the current economic downturn, an economist claims that the credit score of Canadians between the ages of 25 to 40 has remained the same. Prior to the current economic downturn, the mean credit score for Canadians between the ages of 25 to 40 was 652. A random sample of n = 21 Canadians between the ages of 25 to 40 was taken, the mean was found to be 678, with a standard deviation of 46.4. (a) Choose the correct statistical hypotheses. A. Ho: X ≥652, B. Ho: X=652, C. Ho H≥652 D. Họ : a > 652, E. Ho: X > 652, HA: X<652 H:X652 HAH<652 HA: <652 OF. Ho μ 652, HA HA: X ≤652 652 (b) Find a 95% confidence interval for u. Use at least 4 digits after the decmial if rounding. Minimum lower bound= Maximum upper bound= when a 5% when a=5% (c) The sampling distribution used to calculate the confidence interval in part (b) follows a Student's T distribution with degrees of freedom 20 (d) Conducting your statistical test at a 5%, you should reject the null hypothesis. One can conclude from this sample that the mean credit score is not the same as 652 Preview My Answers Submit Answers You have attempted this problem 8 times. Your overall recorded score is 71%. You have unlimited attempte nining