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المشاركة الأصلية كتبت بواسطة Dr.T!TO شكرا كتير rano00nah بس الملف مو راضي بفك عندي انا عندي اوفيس 2007

طيب حنسخلك هيآ

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1- Classify each variable as qualitative or quantitative.
a. Number of bicycles sold in one year by a large sporting goods store. qualitative
b. Colors of baseball caps in a store.quantitative.
c. Times it takes to cut a lawn.qualitative
d. Capacity in cubic feet of six truck beds.qualitative
e. Classification of children in a day-care center (infant, toddler, preschool).quantitative.
f. Weights of fish caught in the red sea.qualitative
g. Marital status of faculty members in a large university.quantitative.


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2- Classify each variable as discrete, continuous, ordinal or nominal.
1. Number of doughnuts sold each day by a doughnuts store.discrete
2. Water temperatures of six swimming pools in Jeddah on a given day.continuous
3. Weights of cats in a pet ter.continuous
4. Lifetime (in hours) of 12 flashlight batteries.continuous
5. Number of cheeseburgers sold each day by a hamburger stand on a college campus.discrete
6. Number of DVDs rented each day by a video store.discrete
7. Capacity (in gallons) of six dams in Saudi Arabia.continuous
8. Ages of people working in a large factory.continuous
9. Number of cups of coffee served at a restaurant. discrete
10. The amount of a drug injected into a patient. continuous
11. The time it takes a student to drive to school.continuous
12. The number of gallons of milk sold each day at a grocery store. discrete
13. Nationality of people who are living in Saudi Arabia.
14. Pages in the city of Jeddah telephone book. ratio
15. Rankings of tennis players.ordinal
16. Weights of air conditioners. ratio
17. Temperatures inside 9 refrigerators. interval
18. Ratings of eight local plays (poor, fair, good, excellent).ordinal
19. Times required for mechanics to do a tune-up. ratio
20. Ages of students in a classroom. ratio
21. Marital status of patients in a physician’s office.
22. Horsepower of tractor engines. ratio
23. Levels of self-satisfaction
24. Number of candy bars sold on a fund drive. ratio
25. Classification of aas subcompactutomobiles , compact, standard, and luxury. ordinal


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4- In each of these statements, tell whether deive or inferential statistics have
been used.
a. Predicting how many miles one would be able to drive a 2000 Toyota Celica during its lifetime.<<< ماعرفت ! مو موجود في الكتآب !
b. A diet high in fruits and vegetables will lower blood pressure. inferential
c. Expenditures for the cable industry were $5.66 billion in 1996. deive
d. The median household income for people aged 25–34 is $35,888.deive
e. Allergy therapy makes bees go away. inferential
f. Drinking decaffeinated coffee can raise cholesterol levels by 7%.inferential
g. The national average annual medicine expenditure per person is $1052.deive
h. Experts say that mortgage rates may soon hit bottom. inferential
i. The average life expectancy in New Zealand is 78.49 years.deive
j. The total amount of estimated losses from hurricane Hugo was $4.2 billion.deive
k. Researchers stated that the shape of a person’s ears is related to the person’s
aggression.inferential
m. In 2013, the number of high school graduates will be 3.2 million students.inferential


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5- Classify each sample as random, systematic, stratified, or cluster.
a. In a large school district, all teachers from two buildings are interviewed to determinewhether they believe the students have less homework to do now than in previous years. cluster
b. Every seventh customer entering a shopping mall is asked to select her or his favoritestore. systematic
c. Nursing supervisors are selected using random numbers in order to determine annual salaries. random

d. Every 100th hamburger manufactured is checked to determine its fat content.systematic
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. stratified
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6- For the following studies, define the type of study, the independent and
dependent variables.
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 of
the groups were compared. ( experimented )

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. ( observational )

c. A researcher finds that people who are more hostile have higher total cholesterol
levels than those who are less hostile. ( observational )

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. ( experimented )

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7- Determine whether each statement is true or false. If the statement is false,
explain why.
a. The height of President Lincoln is an example of a variable.false
b. When the population of college professors is divided into groups according to theirrank (instructor, assistant professor, etc.) and then several are selected from each group to make up a sample, the sample is called a cluster sample.false
c. The variable age is an example of a qualitative variable.sample.false
d. The weight of pumpkins is considered to be a continuous variable.true
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8. The number of absences per year that a worker has is an example of what type of
data?
a. Nominal
b. Ordinal
c. Discrete
d. Continuous
9. A researcher divided subjects into two groups according to gender and then selected
members randomly from each group for his 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 example of what type of data?
a. Nominal
b. Discrete
c. Ordinal
d. Continuous
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.


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13. ...... statistics is based on probability theory.
a. Deive
b. Differential
c. Inferential
d. Answer A & C
14. The number of minutes needed for a student to reach KAU from his home is
... variable.
a. ordinal
b. nominal
c. continuous.
d. discrete.
15. Students' registration numbers (Identification numbers) are example of ... data
a. ordinal
b. nominal
c. continuous.
d. discrete.
16. Which of the following correctly describes the relationship between a sample and a
population?
a. A population and a sample are not related.
b. A sample is a group of subjects selected from a population to be studied.
c. A sample is a group of populations that are subject to observation.
d. A population is a group of samples that may or may not be included in a study.
17. An auto analyst is conducting a satisfaction survey, sampling from a list of 10,000
new car buyers. The list includes 2,500 Ford buyers, 2,500 GM buyers, 2,500 Honda
buyers, and 2,500 Toyota buyers. The analyst selects a sample of 400 car buyers, by
randomly sampling 100 buyers from each brand. Is this an example of a simple random
sample?
a. Yes, because each buyer in the sample had an equal chance of being sampled.
b. Yes, because car buyers of every brand were equally represented in the sample.
c. No, because every possible 400-buyer sample did not have an equal chance of being
chosen.
d. No, because the population consisted of purchasers of four different brands of car.
18. If we have measured the weights of 10 mice, and from this predict the weights of all
mice, then this is an example of …
a. deive statistics.
b. inferential statistics.
c. a population.
d. qualitative data.
19. In the cluster sampling technique …
a. the researcher divided the population into samples and selected groups from the
samples.
b. the researcher divided the population into groups and selected samples from the
groups.
c. the researcher divided the population into samples and selected elements from the
samples.
d. the researcher divided the population into samples.
20. Researchers obtain stratified samples by dividing the population into …
a. subjects.
b. groups.
c. variables.
d. Surveys.
21. Samples within the strata are selected …
a. randomly.
b. clustery.
c. conveniently.
d. Systematically.
22. Temperature in Saudi Arabia is a (an) … variable.
a. discrete
b. continuous
c. nominal
d. ordinal
23. Salaries of the staff in King Abdulaziz University are a (an) … variable.
a. discrete.
b. continuous
c. nominal
d. ordinal
24. Lifetime of an electronic device is a (an) … variable.
a. discrete
b. continuous
c. nominal
d. ordinal
25. A variable that takes whose values in an interval is …
a. discrete.
b. continuous.
c. nominal.
d. ordinal.
26. Researchers want to test new treatments (A, B) on a sample of 30 patients suffering
from flue. They chose 15 of them randomly to take treatment A while the other 15 took
treatment B. Then after three days a doctor will check on them and find out how the
treatments affect the patients. The type of study is …
a. observational.
b. experimental.
c. quasi-experimental.
d. convenient.
27. A high school counselor uses a computer to generate 50 random numbers and then
picks students whose names correspond to the numbers. This is an example of …
a. random sampling.
b. cluster sampling.
c. stratified sampling.
d. systematic sampling.
28. Listing discharged hotel customers, numbering the customers and using random
number table to obtain sample is an example of …
a. random sampling.
b. cluster sampling.
c. stratified sampling.
d. systematic sampling.
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Use the best answer to complete these statements.
29. Probability is used as a basis for …inferential statistics …
30. Two major branches of statistics are desciptive… and inferential … .
31. The group of all subjects under study is called a(n) population… .
32. A group of subjects selected from the group of all subjects under study is called a(n)
…sample
33. A study that uses intact groups when it is not possible to randomly assign
participants to the groups is called a(n) quase-experimental… study.
34. In a research study, participants should be assigned to groups using …......
methods, if possible.




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