Describe and correct the error a student made in writing the exponential function O A. The student made an error by multiplying incorrectly. The final answer should be f(x) =

OB. The student made an error by interchanging the exponent and the base. The final answer should be f(x)=

OC. The student made an error by applying the exponent to the product of a and b instead of just b. The final answer should be f(x) =

OD. The student made an error with substitution. The starting value should be substituted for b and the constant ratio for a. The final answer should be f(x) =​

(20 points) a bank has been receiving complaints from real estate agents that their customers have been waiting too long for mortgage confirmations. the bank prides itself on its mortgage application process and decides to investigate the claims. the bank manager takes a random sample of 20 customers whose mortgage applications have been processed in the last 6 months and finds the following wait times (in days): 5, 7, 22, 4, 12, 9, 9, 14, 3, 6, 5, 15, 10, 17, 12, 10, 9, 4, 10, 13 assume that the random variable x measures the number of days a customer waits for mortgage processing at this bank, and assume that x is normally distributed. 2a. find the sample mean of this data (x ě…). 2b. find the sample variance of x. find the variance of x ě…. for (c), (d), and (e), use the appropriate t-distribution 2c. find the 90% confidence interval for the population mean (îľ). 2d. test the hypothesis that îľ is equal to 7 at the 95% confidence level. (should you do a one-tailed or two-tailed test here? ) 2e. what is the approximate p-value of this hypothesis?