A variable for which no data have been collected but has influence on other variables in the study.

Confounding variable

Step-by-step explanation:

Confounding variables also known as lurking or third variable are varibeks which causes an unwanted or spurious association between an independent and dependent variable. This Confounding variable usually has a relationship between not the independent and dependent variable and if not adequately managed or corrected for, they may cause a relationship which is not intended thereby interfering with the outcome of our research. Such is the correlation between ice cream sale and murder rate.

If the decimal is to the left of the numbers, you go to the right until the first value that is greater than zero and start counting then. If the decimal is to the right (23455.0), start counting at the beginning of the number and then round off once you reach how ever many sig figs you need. So if you needed 3 sig figs, round it off after the the first three numbers (23500.0). Sorry, significant figures are confusing and hard to explain.