Researchers compare the body composition of cattle feeding on a grain diet with that of cattle feeding on a grass diet. This method of gathering data is classified as a census.
a sample survey.
an experiment.
an observational study.

which of the following sets of data would produce the largest value for an independent-measures t statistic? the two sample means are 10 and 20 with variances of 20 and 25 the two sample means are 10 and 20 with variances of 120 and 125 the two sample means are 10 and 12 with sample variances of 20 and 25 the two sample means are 10 and 12 with variances of 120 and 125

What is the factored form of the following expressions? d^2 – 13d + 36

The formula for the volume of a right square pyramid is given below, where a is the side length of the base and h is the height.