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Chapter 1.1, Problem 1AC

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Elementary Statistics: A Step By S...

9th Edition
Allan Bluman
ISBN: 9780073534985

Solutions

Chapter
Section
BuyFindarrow_forward

Elementary Statistics: A Step By S...

9th Edition
Allan Bluman
ISBN: 9780073534985

(1)

To determine

To determine: The variables under study.

Answer

Answer:

The variables under study are grades and attendance.

Explanation

Explanation:

Justification:

A variable is a symbolic representation of a quantity which is likely to vary or change. It is generally a quantity or number that is measured.

The study conducted was based on attendance and grades. These parameters are likely to change and it measured for conducting the study. So, it grades and attendance is variable. The values of these variables changes with different set of data.

Therefore, the variables under study are grades and attendance.

(2)

To determine

To determine: The data under study.

Answer

Answer:

The data under study consists of specific grades and attendance numbers.

Explanation

Explanation:

Given info:

The study revealed the below results on the percentage of students who attended the class and grades received by the students.

Percentage of students attended the class Grades
95 to 100% A
80 to 90% B or C
less than 80% D or an F or eventually withdrew from the class

Justification:

Data refers to the collection of facts or figures from which inferences can be drawn. The data helps us to compare and analyze about the figures.

Grades are characterized to be specific for every student and attendance can be counted in numbers. In the given survey, based on the attendance of the students the grades received by the students are analyzed.

Therefore, the data under study are specific grades and attendance numbers.

(3)

To determine

To find: Whether descriptive, inference or both type of statistics is used.

Answer

Answer:

The statistics which is used is descriptive statistics.

Explanation

Explanation:

Justification:

Descriptive statistics:

Descriptive statistics deals with arranging, tabulating, summarizing and displaying the data.

Manatee Community College has classified their students in different class levels on the basis of their attendance, which summarizes the number of students in each class level.

It organizes and summarizes the data.

Therefore, the statistics used is descriptive statistics.

(4)

To determine

To determine: The population under study.

Answer

Answer:

The population under study is all the students of Manatee Community College (MCC).

Explanation

Explanation:

Justification:

Population:

Population consists of people, objects, events and measurements. A population can be a common feature that can be grouped together.

Here, the study deals with the students in Manatee Community College.

Therefore, the population under study is all the students of Manatee Community College.

(5)

To determine

To determine: Whether the sample was collected or not and from where it was collected.

Answer

Answer:

The sample is data is collected from Manatee Community College.

Explanation

Explanation:

Justification:

Sample:

The information about the population is obtained from the sample. That is, a sample is considered to be a subset of the given population.

The study was conducted on students going to Manatee Community College. The students are taken as sample data. Hence, the sample was collected from Manatee Community College.

(6)

To determine

To explain: The relationship between the variables.

Answer

Answer:

The grades are higher when the attendance is higher.

Explanation

Explanation:

Justification:

Here, as the attendance increases, the grades obtained by the students also increases. Hence, if the attendance rate increases, then the grades are higher.

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