A botanist is studying a newly identified soybean disease. The botanist collected soil samples from all of the soybean fields in randomly selected states to see if there were significant differences the sulfur levels in fields with and without the disease.

1. What is the population?
-all u. s. soil
-all u. s. soybeans

2. What is the sample?
-selected u. s. soil
-selected u. s. soybean fields

3. What is the variable of interest?
-amount of sulfur in soil
-number of soybeans with the disease

4. How was the sample selected?

5. What method was used to collect the data?

6. Is the variable qualitative or quantitative?

7. Is the variable continuous or discrete?

The rate of decay of a radioactive substance depends upon the amount present initially. the mass y (mg) of the radioactive substance cobalt-60 present in a sample at time t (years) is represented by the exponential equation y=50e −0.1315 t . answer the following questions in complete sentences. 1. how does the exponential equation above compare to the equation for simple interest that is compounded continuously? explain the similarities. 2. what is the initial amount of cobalt-60 in the sample? 2. how much cobalt-60 is left after 8.4 years? show your work. 3. what would be the y-intercept of the graph? what does it represent? 4. after how many years will the amount of cobalt-60 left be 6.25 mg? explain what happens to the cobalt-60 after 50 years? 5. discuss some “real-world” examples and uses of cobalt-60

Reduce fractions expressing probability to lowest terms. in 3,000 repetitions of an experiment, a random event occurred in 500 cases. the expected probability of this event is?

Timmy uses 1 1 2 cups of sugar for every 2 gallons of lemonade he makes. how many cups of sugar would timmy use if he makes 13 gallons of lemonade?