Your mother-in-law says that rubbing a carpet stain with toothpaste before applying stain remover helps take the stain out. You are skeptical. You asked an impartial neighbor to set up a randomized experiment to find out whether there is a relationship between the stain removing method and the outcome. She went home to collect and analyze the data, then called you and said In a chi-square test, I would choose the alternative hypothesis, and then hung up. What do you conclude?
a. The toothpaste didn't make a difference.
b. The toothpaste did help after all.
c. The toothpaste had a significant effect but you don't know in which way yet.
d. The toothpaste made things worse.
Question 2
Suppose you find a statistically significant relationship between two categorical variables (with no other supporting evidence available). When can such results correctly lead you conclude a cause and effect relationship?
a. Never.
b. Only when the data were from a randomized experiment.
c. Only when the data were from a random sample.
d. Always; a statistically significant relationship wouldn't be significant unless there is a cause and effect relationship.
Mother giraffe and calves feeding. It is mostly the females that raise young, and they may gather in
Thorough hand rubbing
Performing a Gram Stain
Port-wine stain (nevus flammeus)
linear programming problem, applying simplex method and sensitivity analysis
For each chromosome type in the body, there are two copies. One is from the mother, and one is from