Use the following information for questions #1,2.

You are conducting an experiment to determine the effect of a new drug on the incidence of epileptic seizures. You select 20 epileptics from the 150 epileptics being treated at a nearby hospital and administer the drug to them. You record the number of seizures in each of the 20 subjects for one month.

1.The number of seizure for each subject is an example of a(n)_______.

A constant

b statistic

c dependent variable

d independent variable

2.The average number of seizures for the 150 epileptics would be called a ___.

a.. statistic

b. sample

c. constant

d. parameter

3.A discrete scale of measurement _________.

a. provides exact measurements

b. is the same as a continuous scale

c. necessarily uses whole numbers

d. has an infinite number of values between adjacent units on the scale

4. Which of the following variables has been labeled with an incorrect measuring scale?

a. the number of students in a psychology class - ratio

b. ranking in a beauty contest - ordinal

c. finishing order in a poetry contest - ordinal

d. reaction time in an experiment - nominal

5. A transformed score that designates how many standard deviation units the corresponding raw score is above or below the mean is _______.

a. b score

b. z score

c c score

d q score



Short Answer:

1. Comment on whether will yield the same answer



2. Explain the link between the scatterplot and Pearson r.

 

 

3.  describe what r2 of .30 means



Problems

An IQ test is normally distributed such that the mean is 100 and the standard deviation is

1a What percent of people score below 119?



1b What scores do those who are in the middle 70% of the distribution actually receive ?