ساعدوني في الاحصاء

[طفران في زمن بطارن]

ياشباب المدرس اعطاني هومورك ولا اعرف كيف احله ابي مساعدتكم



هذي هي الاسئله



Homework 1
Name: ID# Section
1- Classify each variable as qualitative or quantitative.
a. Number of bicycles sold in one year by a large sporting goods store.
b. Colors of baseball caps in a store.
c. Times it takes to cut a lawn.
d. Capacity in cubic feet of six truck beds.
e. Classification of children in a day-care center (infant, toddler, preschool).
f. Weights of fish caught in the red sea.
g. Marital status of faculty members in a large university.
2- Classify each variable as discrete or continuous.
a. Number of doughnuts sold each day by a doughnuts store.
b. Water temperatures of six swimming pools in Jeddah on a given day.
c. Weights of cats in a pet ter.
d. Lifetime (in hours) of 12 flashlight batteries.
e. Number of cheeseburgers sold each day by a hamburger stand on a college campus.
f. Number of DVDs rented each day by a video store.
g. Capacity (in gallons) of six dams in Saudi Arabia.
h. Ages of people working in a large factory.
i. Number of cups of coffee served at a restaurant. 2
j. The amount of a drug injected into a patient.
k. The time it takes a student to drive to school.
l. The number of gallons of milk sold each day at a grocery store.
3- Classify each as nominal, ordinal, interval, or ratio level measurement.
a. Pages in the city of Jeddah telephone book.
b. Rankings of tennis players.
c. Weights of air conditioners.
d. Temperatures inside 9 refrigerators.
e. Salaries of the top five CEOs in Saudi Arabia.
f. Ratings of eight local plays (poor, fair, good, excellent).
g. Times required for mechanics to do a tune-up.
h. Ages of students in a classroom.
i. Marital status of patients in a physician’s office.
j. Horsepower of tractor engines.
k. Rating of movies as G, PG, and R.
l. Number of candy bars sold on a fund drive.
m. Classification of automobiles as subcompact, compact, standard, and luxury.
n. Temperatures of hair dryers.
o. Weights of suitcases on a commercial airline. 3
4- In each of these statements, tell whether deive or inferential statistics have been used.
a. In the year 2011, 8000 Saudi students will be enrolled in KAU.
b. Five out of ten on-the-job fatalities are men.
c. Expenditures for the cable industry were $5.66 billion in 1996.
d. The median household income for people aged 25–34 is $35,888.
e. Allergy therapy makes bees go away.
f. Drinking decaffeinated coffee can raise cholesterol levels by 7%.
g. The national average annual medicine expenditure per person is $1052.
h. Experts say that mortgage rates may soon hit bottom.
i. The average life expectancy in New Zealand is 78.49 years.
j. A diet high in fruits and vegetables will lower blood pressure.
k. The total amount of estimated losses from hurricane Hugo was $4.2 billion.
l. Researchers stated that the shape of a person’s ears is related to the person’s aggression.
m. In 2013, the number of high school graduates will be 3.2 million students.
5- Classify each sample as random, systematic, stratified, or cluster.
a. 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.
b. Every seventh customer entering a shopping mall is asked to select her or his favorite store. 4
c. Nursing supervisors are selected using random numbers in order to determine annual salaries.
d. Every 100th hamburger manufactured is checked to determine its fat content.
e. Mail carriers of a large city are divided into four groups according to gender (male or female) and 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- Identify each study as being either observational or experimental.
a. Subjects were randomly assigned to two groups and one group was given an herb and the other group a placebo. After 6 months, the numbers of respiratory tract infections each group had were compared.
b. A researcher stood at a busy intersection to see if the color of the automobile that a person drives is related to running red lights.
c. A researcher finds that people who are more hostile have higher total cholesterol levels than those who are less hostile.
d. Subjects are randomly assigned to four groups. Each group is placed on one of four special diets—a low-fat diet, a high-fish diet, a combination of low-fat diet and high-fish diet, and a regular diet. After 6 months, the blood pressures of the groups are compared to see if diet has any effect on blood pressure.
7- Determine whether each statement is true or false. If the statement is false, explain why.
a. Probability is used as a basis for inferential statistics.
b. The height of President Lincoln is an example of a variable. 5
c. The highest level of measurement is the interval level.
d. When the population of college professors is divided into groups according to their rank (instructor, assistant professor, etc.) and then several are selected from each group to make up a sample, the sample is called a cluster sample.
e. The variable age is an example of a qualitative variable.
f. The weight of pumpkins is considered to be a continuous variable.
Select the best answer:
8. The number of absences per year that a worker has is an example of what type of data?
a. Nominal
b. Qualitative
c. Discrete
d. Continuous
9. A researcher divided subjects into two groups according to gender and then selected members from each group for her sample. What sampling method was the researcher using?
a. Cluster
b. Random
c. Systematic
d. Stratified
10. Data that can be classified according to color are measured on what scale?
a. Nominal
b. Ratio
c. Ordinal
d. Interval 6
11. A study that involves no researcher intervention is called
a. An experimental study.
b. A noninvolvement study.
c. An observational study.
d. A quasi-experimental study.
12. A variable that interferes with other variables in the study is called
a. A confounding variable.
b. An explanatory variable.
c. An outcome variable.
d. An interfering variable.
13. An ad stated that ―Most women have taken the road less traveled.‖ This is an example of
a. Implied Connections.
b. Suspect Samples.
c. Detached Statistics.
d. Changing the Subject.
14. An ad stated that ―Using this product will burn 74% more calories.‖ This is an example of
a. Implied Connections.
b. Suspect Samples.
c. Detached Statistics.
d. Changing the Subject.
15. An ad stated that ―Vitamin E is a proven antioxidant and may help in fighting cancer and heart disease.‖ This is an example of
a. Implied Connections.
b. Suspect Samples.
c. Detached Statistics.
d. Changing the Subject.
16. An ad stated that ―Four out of five doctors surveyed recommend brand such and such.‖ This is an example of
a. Implied Connections.
b. Suspect Samples.
c. Ambiguous Averages.
d. Detached Statistics. 7
Use the best answer to complete these statements.
17. Two major branches of statistics are and .
18. The group of all subjects under study is called a(n) .
19. A group of subjects selected from the group of all subjects under study is called a(n)
20. A study that uses intact groups when it is not possible to randomly assign participants to the groups is called a(n) study.
21. In a research study, participants should be assigned to groups using methods, if possible.