STA 2014 Week 4 Individual Work

Student Name

Course
and Section Number

Program
of Study

STA 2014

Statistics
STA
2014
Week
4 Individual Work

Assignment Instructions

To complete
this assignment:

1. Answer all of the questions below in
the space provided.
2. Reflect on the information presented
in this week’s lesson and provide an insightful response to each question.

Save and Submit to Dropbox

1.
Save
your work as a Microsoft Word 2010 (.docx) file that includes your name,
course code, and title in the file name. For example: XX_STA2014_Week4.docx.
2. To submit your assignment, go to the
Dropbox and click “Submit Assignment.”
3. Click on the drop-down menu to
select the Week 4: Individual Work basket in the Dropbox.

Objectives:Interpret
the process of collecting unbiased data for observational studies and
experiments.
Use
statistical thinking in the process of data collection.

Section 2.1

26. President’s State of Birth:
The following table lists the presidents of the United States (as of October
2010) and their states of birth.

(b) Which state has yielded the most presidents?

Answer: Virginia lead with 8 presidents

(c)
Explain why the answer obtained in part (b) may be misleading.

Answer:

Section
2.2

36. Uninsured Rates: The following data represent
the percentage of people without health insurance for the 50 states and the
District of Columbia in 2009.

With the ?rst class having a lower class limit of
4 and a class width of 2:

(a) Construct a frequency distribution.

Answer:
4.2 to 25.0

(b) Construct a relative frequency distribution.

Answer:

(c) Construct a frequency histogram of the data.

Answer:

(d) Construct a relative frequency histogram of
the data.

Answer:

(e) Describe the shape of the distribution.

Answer:
Skewed Right.

Section
2.3

6. Car Accidents: An article in a student
newspaper claims that younger drivers are safer than older drivers and
provides the following graph to support the claim. Explain how this graph is
misleading.

Answer:25
yrs and older looks like they are 8 times more likely to be in an motor
vehicle accident.

Section
3.1

16. Flight Time: The following data represent the
?ight time (in minutes) of a random sample of seven ?ights from Las Vegas,
Nevada, to Newark, New Jersey, on Continental Airlines.
282,
270, 260, 266, 257, 260, 267

Compute the mean, median, and mode flight time.

Answer:

34. Mr. Zuro finds the mean height of all 14
students in his statistics class to be 68.0 inches. Just as Mr. Zuro finishes
explaining how to get the mean, Danielle walks in late. Danielle is 65 inches
tall. What is the mean height of the 15 students in the class?

Answer:

Section
3.2

20. Travel Time: The following data represent the
travel time (in minutes) to school for nine students enrolled in Sullivan’s
College Algebra course. Treat the nine students as a population.

(a) Determine the population standard deviation.

Answer:

(b) Find
three simple random samples of size 4, and determine the sample standard
deviation of each sample.

Answer:

(c) Which
samples underestimate the population standard deviation? Which overestimate
the population standard deviation?

Answer: