A total of 130 people had their body temperature tested. The subjects were grouped based on if they were men (M) or women (W) and if they had a high (H) or low (L) pulse rate. This gives four groups of people: MH, ML, WH, WL. What distribution (and degrees of freedom) would be used to test if mean body temperatures for these four groups are equal?

The correlation coefficient, r, can be used to decide if data has a strong linear relationship. We always have -1≤r≤1{“version”:”1.1″,”math”:”-1≤r≤1″} .  What values of r  indicate the strongest linear relationship to the data. (Select all statements that indicate a strong linear relationship.)

The oxidation number of aluminum in Al³⁺ is:

What volume (in L) of 1.20 M FeCl₂ would be required to obtain 0.850 moles of Cl⁻ ions?

Determine the mass in grams of 7.75 × 10²¹ atoms of carbon. (The mass of one mole of carbon is 12.01 g.)

What is the oxidation number of S in the compound Na₂S₂O₅?

In this reaction:     If 2.34 moles of Mg react with 3.56 moles of I₂, and 1.76 moles of MgI₂ form, what is the percent yield (in %)?

If 365 mL of 0.285 M MgCl₂ is added to 235 mL of 0.215 M (NH₄)₃PO₄, how many moles of Mg₃(PO₄)₂ precipitate will be formed? The balanced equation is:  

Calculate the molarity of a 10.0% (w/w) CaCl₂ solution. The density of the solution is 1.0835 g/cm³.

Match each symbol with the correct description.