BUS 204 Week 1 Homework 2

BUS 204 Week 1 Homework 2 | MiraCosta College

For this homework problem, please complete the following tasks:

1. Click on the Question Help button on the upper right hand side of the screen. Then click on the Ask My Instructor link which will open up a new window for you to send Dr. Ngo an email. In your email, please provide the following:

a) your preferred name to be called

b) what previous stats courses, if any, you have taken

c) what is one thing you want Dr. Ngo to know about you so she can keep in mind how best to support your learning (any preferences, struggles, concerns, likes/dislikes, etc.)

d) if you could travel anywhere in the world, where would you go?

Make sure to include a greeting and a closing in your email (its always good practice to write professionally)

2. Select the best answer. When I need help or have a question, I should:

A.go see Dr. Ngo during her office hours

B.email Dr. Ngo at [email protected]

C.contact Dr. Ngo using the Ask My Instructor link under Question Help

D.all of the above

2.

When you learned that P is for Population and Parameter and S is for Sample and Statistics, what famous character is shown in the top right hand corner of the screen?

A.Mickey Mouse

B.Elmo

C.Homer Simpson

D.Sponge Bob Square Pants

3.

For the following situation indicate whether the statistical application is primarily descriptive or inferential.

"The manager of Anna's Fabric Shop has collected data for 10 years on the number of each type of dress fabric that has been sold at the store. She is interested in making a presentation that will illustrate these data effectively."

Choose the correct answer below.

A.This application is primarily descriptive in nature. The owner wishes to illustrate the data effectively so that it can be used to draw inferences about the entire data set and future data.

B.This application is primarily inferential in nature. The owner wishes to develop a presentation. She will most likely use charts, graphs, tables and numerical measures to describe her data.

C.This application is primarily descriptive in nature. The owner wishes to develop a presentation. She will most likely use charts, graphs, tables and numerical measures to describe her data.

Your answer is correct.

D.This application is primarily inferential in nature. The owner wishes to illustrate the data effectively so that it can be used to draw inferences about the entire data set and future data.

4.

Think of yourself as working for an advertising firm. Provide an example of how hypothesis testing can be used to evaluate a product claim.

Choose the correct answer below.

A.Ask people which product they prefer.

B.Give people a free sample of a product.

C.Test the durability of a new product compared to its competitors.

Your answer is correct.

D.Use sales numbers to determine which product people prefer.

5.

For each of the following situations, indicate what type of data collection method you would recommend and discuss why you have made that recommendation.

a. collecting data on the percentage of bikers who wear helmets

b. collecting data on the price of

a cheese pizza at restaurants

in the state

c. collecting data on customer satisfaction with the service provided by a bus company

a. Choose the correct answer below.

A.The data should be collected with direct observation so that the data collected are accurate.

B.The data should be collected by experiment so that both internal and external validity can be controlled.

C.The data should be collected by personal interviews so that the questions can be properly interpreted by the interviewer.

D.The data should be collected by telephone or written surveys because they are the cheapest and easiest methods.

b. Choose the correct answer below.

A.The data should be collected by experiment so that both internal and external validity can be controlled.

B.The data should be collected by telephone or written surveys because they are the cheapest and easiest methods.

C.The data should be collected by personal interviews so that the questions can be properly interpreted by the interviewer.

D.The data should be collected with direct observation so that the data collected are more accurate.

c. Choose the correct answer below.

A.The data should be collected by personal interviews so that the questions can be properly interpreted by the interviewer.

B.The data should be collected by telephone or written surveys because they are the cheapest and easiest methods.

C.The data should be collected by experiment so that both internal and external validity can be controlled.

D.The data should be collected with direct observation so that the data collected are more accurate.

6.

Suppose a student is asked to survey students at his university to determine if they are satisfied with the food service choices on campus. What types of biases must the student guard against in collecting the data? Assume that the student conducts a written survey.

Select all that apply.

A.selection bias

B.nonresponse bias

C.leading or poorly worded questions

D.interviewer bias

E.observer bias

7.

Assume you have used an online service to make an airline reservation. The following day, you receive an e-mail containing a questionnaire asking you to rate the quality of the experience. Discuss both the advantages and disadvantages of using this form of questionnaire delivery.

What are the advantages? Select all that apply.

A.Easy

B.Answers are anonymous

C.High response rate

D.Inexpensive

What are the disadvantages? Select all that apply.

A.Possible nonresponse bias

B.Possible interviewer bias

C.Difficult to format the data

D.Expensive

8.

According to the U.S. Bureau of Labor Statistics, the annual percentage increase in U.S. college tuition and fees in 1995 was 6.0%, in 1999 it was 4.0%, and in 2004 it was 9.5%. Are these percentages statistics or parameters? Explain.

Choose the correct answer below.

A.These percentages are parameters since they would include all U.S. colleges.

B.These percentages are parameters since they come from a sample of all U.S. colleges.

C.These percentages are statistics since they come from a sample of all U.S. colleges.

D.These percentages are statistics since they would include all U.S. colleges.

9.

Give the name of the kind of sampling that was most likely used in each of the cases described below.

a. A news organization poll of

2,500

people to determine the president's approval rating

Choose the correct answer below.

A.

Stratified random sampling

B.Systematic random sampling

C.Simple random sampling

D.Cluster sampling

b.

 A poll taken of each of

a motorcycle

manufacturer's dealerships in a region in

September

to determine an estimate of the average number of the manufacturer's

motorcycles

not yet sold by all of the manufacturer's dealerships in the country

A.Stratified random sampling

B.Cluster sampling

C.Simple random sampling

D.Systematic random sampling

c. A quality-assurance procedure within a plant that manufactures corn chips tests every

2,500th

bag of corn chips produced to make sure the bag is sealed properly

A.Systematic random sampling

B.Simple random sampling

C.Cluster sampling

D.Stratified random sampling

d. A sampling technique in which a random sample from each of the tax brackets is obtained by a national tax collection agency to audit tax returns

Choose the correct answer below.

A.Stratified random sampling

B.Simple random sampling

C.Systematic random sampling

D.Cluster sampling

10.

Your manager has given you an Excel file that contains the names of the company's 500 employees and has asked you to sample 50 employees from the list. You decide to take your sample as follows. First, you assign a random number to each employee using Excel's random number function Rand(). Because the random number is volatile (it recalculates itself whenever you modify the file), you freeze the random numbers using the

Copy—Paste

Special—Values

feature. You then sort by the random numbers in ascending order. Finally, you take the first 50 sorted employees as your sample. Does this approach constitute a statistical or a nonstatistical sample?

Choose the correct answer below.

A.This is a statistical sample. Not every employee has a chance of being selected using this method. In fact, this is an example of convenience sampling because the decision of who to sample is made prior to the sampling process.

B.This is a nonstatistical sample. Not every employee has a chance of being selected using this method. In fact, this is an example of convenience sampling because the decision of who to sample is made prior to the sampling process.

C.This is a nonstatistical sample. Every employee has a chance of being selected using this method. In fact, this is an example of a simple random sample because every possible sample of size 50 has an equal chance of being selected.

D.This is a statistical sample. Every employee has a chance of being selected using this method. In fact, this is an example of a simple random sample because every possible sample of size 50 has an equal chance of being selected.

11.

A wireless service provider has a support center customers can call to get questions answered about their cell phone accounts. The manager in charge of the support center has recently conducted a study in which

he

surveyed

2,900

customers. The customers who called the support center were transferred to a third party, who asked the customers a series of questions. Complete parts a through c below.

a. Indicate whether the data generated from this study will be cross-sectional or time-series. Explain why.

The data will be

cross-sectional

because the values were observed at

a fixed point

in time.

b. One of the questions asked customers was approximately how many minutes they had been on hold waiting to get through to a support person. What level of data measurement is obtained from this question? Explain.

The data are

ratio

because the values

can be measured on a scale and have a true zero.

c. Another question asked the customer to rate the service on a scale of

1–5,

with 1 being the worst possible service and

5

being the best possible service. What level of data measurement is achieved from this question? Will the data be quantitative or qualitative? Explain.

The data are

ordinal

and

qualitative

because the values

are codes for categories that can be ranked.