Me answer the following questions. 1. give 2 examples of hypotheses that you could test by conducting a controlled experiment. 2. a student hypothesizes that exercise will increase clothespin squeezing rate. what is the dependent variable? what is the independent variable? what other variables should be kept constant? 3. a student hypothesizes that eating pizza will increase test scores? what is the dependent variable? what is the independent variable? what other variables should be kept constant? ~ you for the .

1. I answered that earlier.

2. -Dependent Variable (Variable affected by change): Clothespin squeezing rate

-Independent Variable (What is changed): amount of exercise

-Constant: Type of exercise and Type of clothespins

3. -Dependent Variable (Variabled affected by change): Test Scores

-Independent Variable (What is changed): What they eat (Pizza)

-Constant: Type of pizza and Type of test

americans began to notice growing differences between the northern and southern sections of the country. there were more people living in cities in the north, which made it more urban. more people lived on farms in the south, which made it more rural. while many people were farmers in the northern states, there were now other ways to make a living, such as working in mechanical cotton gins factories manufacturing cloth, tools and other goods. people in the north supported high tariffs on goods imported from europe because the extra cost encouraged people to “buy american” instead. in the southern states, planters did not like tariffs because they sold most of their production to europe and bought their tools from there as well. southerners believed the protective tariff was something that only northern factory owners keep their profits high. so the southern politicians came up with an idea. they would opt out. they would simply ignore the protective tariff. it was ‘null and void’ in south carolina. the state would not collect the taxes on goods imported into south carolina, no matter what the president said they had to do. this decision led to the nullification crisis.