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Chapter 1: Q. 43 (page 52)

Ski resorts are interested in the mean age that children take their first ski and snowboard lessons. They need this information to plan their ski classes optimally.

Short Answer

Expert verified

a. All youngsters who are taking their first ski or snowboard lessons make up the population.

b. This is a sampling of the youngsters in the group.

c. The population mean age of youngsters taking their first snowboard instruction is the parameter.

d. The sample mean age of youngsters who take their first snowboard instruction is the statistic.

e. X is the age of a youngster who is learning to ski or snowboard for the first time.

f. Values for X, such as 3,7, and so on..

Step by step solution

01

Introduction

Apopulationisadistinctgroupofpeople,whetheritisacountryoracollectionofpeoplewhoshareasimilarattribute.
A population is the group of people from which a statistical sample is selected for a research in statistics.
As a result, a population may be defined as a collection of people who are linked by a common characteristic.
02

Explanation for a

The demographic will be youngsters who are taking their first ski and snowboard lessons, according to the information supplied.

03

Explanation for b

Based on the information supplied, a sample of this data will be drawn from a randomly selected group of children.

04

Explanation for c

The population mean age of children who take their first ski and snowboard lessons will be the parameter of this data, according to the details supplied.

05

Explanation for d

The sample mean age of youngsters that take their first ski and snowboard lessons will be the statistic of this data, according to the specified details.

06

Explanation for e

The age of a single child will be the variable of this data, according to the specified details.

07

Explanation for f

According to the provided details, the data will be the value of the variable like 10 years or 12 years and so on.

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Most popular questions from this chapter

Use the following information to answer the next seven exercises: Studies are often done by pharmaceutical companies to determine the effectiveness of a treatment program. Suppose that a new AIDS antibody drug is currently under study. It is given to patients once the AIDS symptoms have revealed themselves. Of interest is the average (mean) length of time in months patients live once starting the treatment. Two researchers each follow a different set of 40 AIDS patients from the start of treatment until their deaths. The following data (in months) are collected.

Researcher A: 3; 4; 11; 15; 16; 17; 22; 44; 37; 16; 14; 24; 25; 15; 26; 27; 33; 29; 35; 44; 13; 21; 22; 10; 12; 8; 40; 32; 26; 27; 31; 34; 29; 17; 8; 24; 18; 47; 33; 34

Researcher B: 3; 14; 11; 5; 16; 17; 28; 41; 31; 18; 14; 14; 26; 25; 21; 22; 31; 2; 35; 44; 23; 21; 21; 16; 12; 18; 41; 22; 16; 25; 33; 34; 29; 13; 18; 24; 23; 42; 33; 29

Suppose that the second researcher conducted his survey by choosing 40 patients he knew. What sampling method would that researcher have used? What concerns would you have about this data set, based upon the data collection method?

1.13, Find the number of towns that have rainfall between 2.95 and 9.01 inches.

A “random survey” was conducted of 3,274people of the “microprocessor generation” (people born since 1971, the year the microprocessor was invented). It was reported that 48% of those individuals surveyed stated that if they had $2,000to spend, they would use it for computer equipment. Also, 66%of those surveyed considered themselves relatively savvy computer users.

a. Do you consider the sample size large enough for a study of this type? Why or why not?

b. Based on your “gut feeling,” do you believe the percents accurately reflect the U.S. population for those individuals born since 1971? If not, do you think the percents of the population are actually higher or lower than the sample statistics? Why? Additional information: The survey, reported by Intel Corporation, was filled out by individuals who visited the Los Angeles Convention Center to see the Smithsonian Institute's road show called “America’s Smithsonian.”

c. With this additional information, do you feel that all demographic and ethnic groups were equally represented at the event? Why or why not?

d. With the additional information, comment on how accurately you think the sample statistics reflect the population parameters

Use the following information to answer the next seven exercises: Studies are often done by pharmaceutical companies to determine the effectiveness of a treatment program. Suppose that a new AIDS antibody drug is currently under study. It is given to patients once the AIDS symptoms have revealed themselves. Of interest is the average (mean) length of time in months patients live once starting the treatment. Two researchers each follow a different set of 40 AIDS patients from the start of treatment until their deaths. The following data (in months) are collected.

Researcher A: 3; 4; 11; 15; 16; 17; 22; 44; 37; 16; 14; 24; 25; 15; 26; 27; 33; 29; 35; 44; 13; 21; 22; 10; 12; 8; 40; 32; 26; 27; 31; 34; 29; 17; 8; 24; 18; 47; 33; 34

Researcher B: 3; 14; 11; 5; 16; 17; 28; 41; 31; 18; 14; 14; 26; 25; 21; 22; 31; 2; 35; 44; 23; 21; 21; 16; 12; 18; 41; 22; 16; 25; 33; 34; 29; 13; 18; 24; 23; 42; 33; 29

Complete the tables using the data provided:

Suppose you want to determine the mean number of students per statistics class in your state. Describe a possible sampling method in three to five complete sentences. Make the description detailed.
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