Determine whether the sample may be biased. Explain. An automobile dealer surveys its customers to determine their level of satisfaction with the services provided at the dealership. The sample is chosen from a list of customers who gave the dealership an e-mail address.
Select one:
a. The sample is not biased. It is a random sample.
b. The sample is biased. Not all customers of the automobile dealership have an e-mail address.

The federal reserve controls certain interest rates in the united states. investors often try to speculate as to whether the federal reserve will raise or lower rates and by how much. suppose a company conducts extensive interviews with financial analysts, and as a result, predicts that "thefed" will increase rates by an average of 0.25 percentage points every six months for the forseeable future. which type of equation could be used to model the predicted interest rates over the next several years, assuming no other significant changes? a) a linear equation b) a quadratic equation c) a polynomial equation d) an exponential equation