PLEASE HELP ASAP ITS TIMED WILL DO BRAINLIEST Let i be the imaginary number √-1

. Determine whether the expression a+bi

, where a and b are real numbers, represents a real number or a non-real complex number for each case below. Select Real Number or Non-Real Complex Number for each case.

Ur environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 4.04.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 2525 samples is 4.44.4 ppm with a standard deviation of 0.80.8. assume the population is normally distributed. a level of significance of 0.020.02 will be used. make the decision to reject or fail to reject the null hypothesis. answer tables