Find the null and alternative hypotheses, Type I and Type II Error and determine whether the alternative hypothesis is directional or non-directional

Question

A researcher is interested in studying whether infants can show empathy toward adults. She randomly assigns each infant to sit in a room with an adult who is pretending to cry or to sit in a room with an adult who is not showing any emotion and measures how distressed the infants become.  She believes that they will become more distressed in rooms with crying adults than in rooms where the adult is not showing emotion. 

Answer 1

Null hypothesis: infants who are in a room with a crying adult will not show any signs of distress.

Alternative hypothesis: Infants will show more signs of distress when seated in a room with a crying adult than when seated in a room with an adult who is not showing any emotion. This is a directional hypothesis because you are specifying the anticipated direction (i.e., more rather than less distress) of change in the infants display of emotional distress.

Type I error: this occurs when you correctly reject the null hypothesis. For instance, if the null hypothesis is that infants will not show signs of distress when in a room with a crying adult and results of the study show that infants are MORE likely to show signs of distress when seated with a crying adult then you would reject the null hypothesis because the data showed that infants actually were more distressed when with a crying adult.

Type II error: this refers to rejecting the null hypothesis when it is actually true. For instance, the type 2 error will be the likelihood of saying infants did not show signs of distress when seated with a crying adult (null hypothesis) when the data showed the opposite to be true (i.e., the infants showed no signs of distress when seated in a room with a crying adult but you reject the null hypothesis).