Question

z scores are useful for A) finding the average B) measuring distance C) comparing scores on different scales D) none of the above

Kurtosis refers to a distribution that is negatively skewed. True or false

The following is an example of a null hypothesis: People who eat dinner after 6 PM weigh more than people who do not eat after 6 PM. True or False

The following is an example of a directional hypothesis: Students who spend more hours studying get higher grades than students who spend less hours studying. True or False

If a researcher concludes that a variable has an effect when it really doesnt, the research has made what type of error?

Answer 1

1) z scores are useful for

- C) comparing scores on different scales

z scores gives the standardised deviation

2) Kurtosis refers to a distribution that is negatively skewed.

- False

Kurtosis is used to compare difference in peak wrt normal distribtuion in both positive as well as negative skew

3) The following is an example of a null hypothesis: People who eat dinner after 6 PM weigh more than people who do not eat after 6 PM.

- True

Null hypothesis basically indicates there is no significant difference caused by the treatment. Thus, making the two to have same effect

4) The following is an example of a directional hypothesis: Students who spend more hours studying get higher grades than students who spend less hours studying.

- True

Direction analysis is the one which predicts the direction i.e. effect of one variable on the other

5) If a researcher concludes that a variable has an effect when it really doesnt, the research has made what type of error?

- Type II error