1. the tables below show the values of y corresponding to different values of x: table a x 3 2 1 y 1 0 0 table b x 3 5 4 y −2 1 1 which statement is true for the tables? both table a and table b represent functions. both table a and table b do not represent functions. table a does not represent a function, but table b represents a function. table a represents a function, but table b does not represent a function. 2. which of the following statements best describes the effect of replacing the graph of f(x) with the graph of f(x) + 4? the graph shifts 4 units up. the graph shifts 4 units down. the graph shifts 4 units left. the graph shifts 4 units right.

(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?