A. In each of the following situations, a random sample must be obtained. Determine whether a cluster, stratified, or systematic random sampling would be appropriate. Explain in detail how the sampling is to be conducted. Do not discuss expected results or conclusions. A large convenience store chain wishes to determine its customers’ level of satisfaction with regard to their service. A nationwide survey on charter change is to be conducted. (Note: there are seventeen regions in the Philippines.) An educational researcher wants to compare the difference in career goals between male and female students of Otto Hahn University who has 10,000students. A social researcher wants to determine whether electronic engineers who work in the communications field earn more than those who are in the semiconductor industry. A market analyst would like to compare the durability, in terms of mean time before wear, of two leading brands of car tires. B. The numbers of incorrect answers on a true or false competency test for a random sample of 15 students were recorded as follows: 2, 1, 3, 0, 1, 3, 6, 0, 3, 3, 5, 2, 1, 4, and Find a. mean, b. median, c. mode, d. range, e. standard deviation, f. variance. C. At what level are the following variables measured? _______ 1.The scores of students in a statistics quiz _ 2.The birth order of children in the family _ 3.Weights of a sample of bags of raw materials for the production of a certain product, measured in grams. _ 4.The natural eye color of a sample of 100 children. _________ 5.The final grade of graduate students taking up Statistics

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section11.4: Collecting Data

Problem 7E

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A. In each of the following situations, a random sample must be obtained. Determine whether a cluster, stratified, or systematic random sampling would be appropriate. Explain in detail how the sampling is to be conducted. Do not discuss expected results or conclusions.

A large convenience store chain wishes to determine its customers’ level of satisfaction with regard to their service.
A nationwide survey on charter change is to be conducted. (Note: there are seventeen regions in the Philippines.)
An educational researcher wants to compare the difference in career goals between male and female students of Otto Hahn University who has 10,000students.
A social researcher wants to determine whether electronic engineers who work in the communications field earn more than those who are in the semiconductor industry.
A market analyst would like to compare the durability, in terms of mean time before wear, of two leading brands of car tires.

The numbers of incorrect answers on a true or false competency test for a random sample of 15 students were recorded as follows: 2, 1, 3, 0, 1, 3, 6, 0, 3, 3, 5, 2, 1, 4, and Find a. mean, b. median, c. mode, d. range, e. standard deviation, f. variance.

At what level are the following variables measured?

_______________ 1.The scores of students in a statistics quiz

_______________ 2.The birth order of children in the family

_______________ 3.Weights of a sample of bags of raw materials for the production of a certain product, measured in grams.

_______________ 4.The natural eye color of a sample of 100 children.

_______________ 5.The final grade of graduate students taking up Statistics

Definition Definition Measure of central tendency that is the value that occurs most frequently in a data set. A data set may have more than one mode if multiple categories repeat an equal number of times. For example, in a data set with five item—3, 5, 5, 29, 473—the mode is 5 because it occurs twice and no other value occurs more than once. On a histogram or bar chart, the element with the highest bar represents the mode. Therefore, the mode is sometimes considered the most popular option. The mode is useful for nominal or categorical data (e.g., the most common color car that users purchase), but it is problematic for continuous data because it is more likely not to have any value that is more frequent than the other.

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