The value of the correlation coefficient r is useful indicator of the strength of an association between two variables when 1) one variable is numerical and the other is nominal
2) both variables are categorical
3) both variables are numerical and the association is linear
4) one variable is nominal and the other ordinal
5) none of the above

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?

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

Over the course of a month, a person's weight decreases. what type of relationship is this? a. positive relationship