# Identifying Sample and Populations

Identify the sample and population

1. a. A group of 50,000 randomly selected college students were surveyed about whether they have a TV in their dorm room. Only 75% said yes to the question.

i. Sample -

ii. Population -

b. An employee at the local ice cream emporium asks 3 customers if they liked cookie dough ice cream.

i. Sample

ii. Population

Identify descriptive statistics and inferential statistics.

2.a. The table shows the total number of births in the U. S. for the years 2000 - 2004

Year Births

2000 5,158,222

2001 5,025,125

2002 4,952,555

2003 4,625,123

2004 4,000,236

Is the study descriptive or inferential?

b.Based on a random sample of 2500 people, the estimates of people lacking health insurance in one Northern city are found in the table

Age Percent not covered

18 - 25 28.2

26 - 40 24.9

41 - 55 19.1

56 - 66 16.5

Is the study descriptive or inferential?

Section 1.2:

Identify the type of data as qualitative or quantitative.

3. a. The colors of new SUVs on a used car dealership lot.

b. The number of SUVs on a used car dealership lot.

Identify the levels of measurement.

Determine which of the four levels of measurement (nominal, ordinal, interval, or ratio) is most appropriate.

4. a. The temperature of the oceans at different depths

b. Survey responses of "Best", "Better", "Good", "Poor"

c. Ages of high school teachers

d.Subjects in which university students major

Section 1.3:

Identify the sampling techniques.

Determine which of the five samples is described in the situation (stratified sample, cluster sample, random sample, systematic sample, convenience sample)

5.a. A researcher selects and interviews 100 male and 100 female college teachers

b. Every 7th person leaving the theater at a newly-premiered movie is survey to see if they would recommend the movie to other.

c. A researcher for an airline asked all the passengers on 10 selected Sunday flights.

d. A university student in a Statistics class surveys all students in the student center at 10 am to 11 am to determine who is pleased with the new tuition increase.

e.A lobbyist for a major defense firm assigns a number to each legislator in his state. Then a computer is used to randomly generate ten numbers. The lobbyist contacts the legislator assigned those ten numbers.

#### Solution Preview

1. a. A group of 50,000 randomly selected college students were surveyed about whether they have a TV in their dorm room. Only 75% said yes to the question.

i. Sample - 50,000

Since we choose 50,000 randomly selected student in survey of "they have a TV in their dorm room or not."Therefore 50, 000 students is in the sample.

ii. Population - Population is the total group of students where we are taken among the sample of 50000 students.

b. An employee at the local ice cream emporium asks 3 customers if they liked cookie dough ice cream.

i. Sample : Since we want to take only three customers in the experiment. thus sample is 3.

ii. Population : In this experiment/survey we choose opinion of the all customers. Thus populations is the customers who like or dislike cookie dough ice cream.

Identify descriptive statistics and inferential statistics.

2.a. The table shows the total number of births in the U. S. for the years 2000 - 2004

Year Births

2000 5,158,222

2001 ...

#### Solution Summary

The solution identifies sample and populations for college students have TV in their dorm rooms.