The median cost to air condition a house in florida during the summer last year was $1,870. this year the median cost to air condition the same house is $1,950. find the rate of inflation.

4.3%

4.2%

4.0%

4.1%

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