stats

1. By looking at a graph of the data, the human resources department has identified a relationship between the amount of training time and the subsequent performance of employees. Which basic activity of statistics is involved? (3 pts)

2. What is involved in the design phase of a statistical study? (3 pts)

3. Use the following to answer questions: World University has published data about undergraduate enrollments in their view book for prospective applicants: (6 pts)

a. What is an elementary unit for this data set?

b. What kind of data set is this e.g. univariate?

c. Is this cross-sectional or time-series data?

d. Which of these variables are qualitative? For each, identify whether it is nominal or ordinal.

e. Which of these variables are quantitative? For each, identify whether it is continuous or discrete?

4. An automotive engineer is interested in studying the performance of compact cars from different manufacturers. (6 points)

 

Horsepower	Miles per gallon	Number of Cylinders	Weight	Country origin
100	19.7	8	3365	United States
150	16.9	8	4360	Germany
140	15.5	6	4054	United States
75	36.4	4	1980	Japan
90	22.6	4	2800	Japan

a. What is the elementary unit for this data set?

b. What kind of data set is this?

c. Which of these variables are quantitative? Identify which are continuous or discrete.

d. Which of these variables are qualitative? For each, identify whether it is nominal or ordinal.

e. Is this cross-sectional or time series data?

Year

Total Applicants

Accepted

Wait Listed

1992

10,276

1,450

275

1993

11,141

1,500

250

1994

12,077

1,475

250

1995

13,396

1,460

225

1996

13,558

1,450

200

1997

14,122

1,450

175

1998

14,733

1,450

150

1999

15,006

1,425

100

2000

15,891

1,425

50

2001

16,728

1,425

50