Probability and Statistics
HW 2 – Sampling Methods
Directions:
Name_________________________________________
Classify as either descriptive or inferential.
__________1. The average price of a home sold in Anderson County was $235,000.
__________2. According to the Census Bureau, 20% of all American workers carpool to work.
__________3. The National Eye Institute has halted a clinical trial on a type of eye surgery, calling it
ineffective and possibly harmful to a person’s vision.
__________4. According to the Court Administration of Pennsylvania, 15% of trial-ready civil actions
and equity cases in Philadelphia during 1993 were decided in less than six months.
__________5. Researchers state that the size of a person’s head is relative to his/her intelligence.
__________6. Cigarettes were associated with 29% of the 4,470 civilian fire deaths in 1989.
Directions:
Classify each as nominal, ordinal, discrete, or continuous.
__________1. Ratings of newscasts in Houston as either poor, fair, good, or excellent
__________2. Time required by drivers to complete a course.
__________3. Marital status of respondents to a survey on savings accounts
__________4. Ages of students enrolled in a martial arts course.
__________5. Rankings of weight lifters
__________6. Number of loaves of bread baked each day at a bakery
__________7. Lifetime of batteries in a tape recorder
__________8. Weights of newborn infants in the hospital
__________9. Colors of jackets in a men’s clothing store
__________10. Length of a fish caught in a stream
__________11. Number of students who pass this class
Directions:
Classify the type of sample as random, systematic, stratified, cluster, or
convenience.
__________1. In a large school district, all teachers from two buildings are interviewed to determine
whether they believe the students have less homework to do now than in previous
years.
__________2. Every seventh customer entering a shopping mall is asked to select his or her favorite
store.
__________3. Nursing supervisors are selected using random numbers in order to determine annual
salaries.
__________4. Every hundredth hamburger manufactured is checked to determine its fat content.
__________5. Mail carriers of a large city are divided into four groups according to whether they walk
or ride on their routes. Then 10 are selected from each group and interviewed to
determine whether they have been bitten by a dog in the last year.
__________6. A student interviews everyone in his class to find out who owns their own car.