To measure the emission of carbon dioxide from the soil, a scientist places a chamber over the soil. She continuously measures atmospheric CO2 concentration in the chamber during the sampling period. She performed the measurements three times and each time sampled for a different length. Her results are below. What is the order of samples from greatest rate of emission (CO2 / second) to lowest?

The mean weight of loaves of bread produced at the bakery where you work is supposed to be 1 pound. You are the supervisor of quality control at the bakery, and you are concerned that new employees are producing loaves that are too light. Suppose you weigh an SRS of bread loaves and find that the mean weight is 0.975 pound. What are the appropriate hypotheses for performing this significance test? Ho : x = 1; H. : x < 1 where i = the sample mean weight (in pounds) of bread loaves produced at the bakery. Ho : u = 1; H. : µ < 1 where u = the true mean weight (in pounds) of bread loaves produced at the bakery. Ho : µ < 1; H, : H = 1 where u = the true mean weight (in pounds) of bread loaves produced at the bakery. Ho : u = 1; H. : p = 0.975 where u= the true mean weight (in pounds) of bread loaves produced at the bakery. Ho : u = 1; H. : u # 1 where u= the true mean weight (in pounds) of bread loaves produced at the bakery.

I'm having trouble finding the dependent and independent variables of this scenaro:  Average IQ scores for young school children are known to be 100 (SD = 15).  However, the literature indicates that children’s intelligence may be decreased if their mothers have German measles during pregnancy.  Using hospital records, a researcher obtained a sample of n = 25 school children whose mothers all had German measles during their pregnancies.  Do the data indicate that children born to mothers who had German measles during the pregnancy have significantly lower IQ scores than typical young school children?

In general, the ______ variable is purposely changed in an experiment.