this is four question that are due at the end of class. it will take you all class. i do not need the r code, but you sould show your work on paper when you do work outside of r.
i cannot help you. use your group, and only your group.
1) A scientist samples 20 pieces of wood and samples how much force is required to break the pieces. Here are the results:
332, 319, 326, 265, 333, 323, 330, 320, 305, 327, 230, 309, 327, 337, 323, 241, 302, 313, 287, 319
a) make a histogram of the data and describe the shape.
b) are there any outliers? Explain which test you used to check and why you used that test.
c) remove any outliers (if there are any) and give me a 95% confidence interval for the amount of force required to break the wood.
2) Scores for the ACT are roughly N(21.2, 5.0)
a) What is the Z-score for someone who scores a 31?
b) What percent of people score below an 18?
c) What percent of people score above a 24?
3) Several thousand teens were asked whether or not they thought they would be married in the next ten years. Below is the table:
a) What percent of females believe they have a 50-50 chance of being married in ten years?
b) is there a correlation between sex and whether or not they believe they will be married? Explain what step you took to get the answer.
c)What is the expected value for female-almost certain?
4) Coca-cola claims that there are 20 oz in a 20 oz coke. we sample 10 bottles, checking to see if they are giving us under (more is fine):
19.8, 20.1, 19.6, 19.4, 20.0, 19.7, 20.6, 20.4, 19.5, 19.3,
Run through the process and test our hypothesis, making sure to follow each step as you proceed.