All of the following statements are true of confidence intervals EXCEPT:
a. The 90% level of confidence corresponds to ±2.58 standard errors.
b. Confidence intervals reflect the degree of accuracy in estimating the population parameter.
c. Confidence intervals stipulated as a level of confidence in the form of a range with a lower boundary and an upper boundary.
d. Typically, marketing researchers rely only on the 99%, 95%, or 90% levels of confidence,
e. By far, the most commonly used level of confidence in marketing research is the 95% level.
Answer: a. The 90% level of confidence corresponds to ±2.58 standard errors.