# Introductory Statistics and Emergency Management Questions Please be aware, this assignment is emergency.Please finish on time, should be easily doable.Ple

Introductory Statistics and Emergency Management Questions Please be aware, this assignment is emergency.Please finish on time, should be easily doable.Please look at the file.After you have done, there are few questions coming up after this homework. Homework 1 (7 pages)

Name: _________,_________

(Print) last

first

1. Your heart beat per minute: ________

2. Your commute distance from your home to campus. Give your answer to nearest tenth of a

mile.______

3. Your head circumference, as you would to buy a perfect fitting hat. Give your answer to

nearest tenth of centimeter. You may have to get creative, if you dont have a tape measure.

______

4. A drug manufacturer is interested in the proportion of persons who have hypertension

(elevated blood pressure) whose condition can be controlled by a new drug the company has

developed. A study involving 5000 individuals with hypertension is conducted and it is found

that 8 percent of the individuals are able to control their hypertension with the drug. Assuming

that the 5000 individuals are representative of the group who have hypertension, answer the

following questions:

a. What is the population?

b. What is the sample?

c. Identify the parameter of interest.

d. Identify the statistic and give its value.

e. Do we know the value of the parameter?

5. Identify each of the following as examples of attributive, discrete, or continuous variables.

a. you are polling registered voters as to which candidate they support

b. length of time required for a wound to heal when using a new medicine.

c. the number of telephone calls arriving at a switchboard per 10-minute period.

d. the distance first-year college women can kick a football.

e. the number of pages per job coming off a computer printer.

f. the kind of tree used as a Christmas tree.

g. the breaking strength of a given type of string.

h. the hair color of children auditioning for the musical Annie.

i. the number of stop signs in towns of less than 500 people.

j. whether or not a faucet is defective.

k. the number of questions answered correctly on a standardized test.

6. Management Efficiency Consultants are called upon to help companies become more

efficient in their operations. One of the first studies they conduct is to determine the amount of

time executives spend in meetings. For one company the data for 25 executives were as

follows (in hours per week):

12 9 6 7 15 18 26 13 21 10 5 7 24

12 2 17 3 8 9 10 11 10 6 25 19

1

a. Make a stem-and-leaf diagram.

b. Find the mean, median, mode, midrange, range, and the five-number-summary. Graph the

box-plot.

3. Graph a five-class histogram for the following data. Label and scale the axes, and describe

the shape of distribution. Complete the table at the right.

Data: 43.3

54.4 48.7 57.0 58.9 54.9 36.8 59.9 45.9 43.2 73.1 37.0

56.4 59.9 70.7 43.8 50.9 57.6 38.1 47.1 74.4 39.8 68.9 40.1

53.6 50.2 69.7 65.2 66.3 66.6

Class

Frequency

2

6. Bob earned 116 on his accounting midterm and 82 on his biology midterm exams. For the

accounting midterm, the mean score was 102 with standard deviation 14. For the biology

midterm, the mean score was 70 with standard deviation 5.

(a) Convert each midterm score to a standard score (z).

(b) Which score was the higher with respect to the rest of the

class? Explain your answer.

8. For each of the following 4 data sets:

a. Hypothesis how the standard deviation changes going from left to right.

__________________________________________________________________________

b. For each data set, find the standard deviation from definition.

c. Does your calculation in part b confirm your hypothesis in part a? __________________

3

9. For each of the following pair of sample data, determine the correct relationship for the

sample mean and the sample standard deviation.

4

11. Consider the list of variables and graphs. Match and briefly explain your reasoning for

your choice.

a. Scores on a fairly easy examination is statistics;

b. Heights of group of college students;

c. Number of medals won by countries in the 2006 Winter Olympics;

d. SAT scores for a group of college students.

1.

2.

3.

4.

5

12. A study of car accidents and drivers who use cellular phones produced the following data:

Had

Had no

Row

accident in accident in the Total

the last year last year

Cellular phone user 405

45

Not a cellular phone

user

Column Total

280

20

Find the following probabilities:

a. P(person is a cellular phone user).

Make sure to include both a fraction as well as decimal value for the

probability questions

b. P(person had no accident in the last year).

c. P(person had no accident in the last year and was a cellular phone user).

d. P(person is a cellular phone user or person had no accident in the last year).

e. P(person had accident given cellular phone user).

f. Are the events in part e independent? Explain.

6

3. An urn has 3 red marbles and 8 blue marbles in it. Draw two marbles, one at a time, without

replacement from the urn.

a. Construct a tree diagram with the

listing of all the outcomes and all of

the corresponding probabilities.

Compute the following probabilities:

b. P( RR)

c. P( RB or BR )

d. P( R on 2nd | B on 1st )

e. P( R on 1st and B on 2nd )

f. Are the events in c independent? Explain.

4. A box contains ten ballpoint pens, eight of which write properly and two of which do not

write. You are going to select two of these pens.

Construct a tree diagram with the

listing of all the outcomes and all

of the corresponding probabilities.

a.

What is the probability of one defective pen?

b. What is the probability of at least one defective pen?

c.

What is the probability of no defective pen?

7

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