What method of data collection would you use to collect data for a study of the salaries of college professors at a particular college?

        use a simulation

        perform an experiment

        use sampling

        take a census

 

 

There is a relationship between smoking cigarettes and getting emphysema. This statement describes (Points : 3)

        inferential statistics

        descriptive statistics

 

 

The number of seats in a movie theater are        quantitative

        qualitative

 

 

4.To ensure customer satisfaction, every 5th phone call received by customer service will be monitored. What sampling technique is used?

        random

        stratified

        systematic

        convenience

        cluster

 

 

5. The average salary of all General Motors workers is $42,500. This number is a

        parameter

        statistic

 

 

6. Subjects in a sample, when properly selected, should possess

        the same or similar characteristics as the population desired.

        the same number of discrete variables as the population desired.

        the same qualitative characteristics as the population desired.

        confounding variables that differ from the population desired.

 

 

7. Suppose the standard deviation is 12.4. What is the variance?

        12.4

        153.76

        3.52

        14.6

 

 

8. This data shows the final exam scores of 10 randomly selected students and the number of hours they studied for an exam. (hours, scores) (3, 65), (5, 80), (2, 60), (8, 88), (2, 66), (4, 78), (4, 85), (5, 90), (6, 80), (3, 71)

 

 

Find the equation of the regression line for the given data.

        y = 4.4747x + 57.506

        y = -4.4747x + 57.506

        y = 57.506x + 4.4747

        y = 57.506x – 4.4747

 

 

9. A multiple regression equation is y = -8.5 + 0.964a + 8.104b, where ‘a’ is a person’s age, ‘b’ is the person’s body fat percentage, and ‘y’ is the person’s lean mass percentage. Predict the lean mass for a person who is 27 years old and has a body fat of 0.045. (Points : 8)

        34.89

        17.16

        22.35

        17.89

 

 

10. Interpret an r value of -0.82.

        strong negative correlation

        weak negative correlation

        strong positive correlation

        no correlation

 

 

 

1.

Use this table to answer the questions.

Time (in minutes              Frequency

20-24     8

25-29     14

30-34     23

35-39     10

40-44     17

1. Identify the class width.

2. Identify the midpoint of the first class.

3. Identify the class boundaries of the first class.

4. Give the relative frequency for each class.

 

 

(1) 5

(2) 22

(3) 19.5 and 24.5

(4) First class: 0.1111, Second class: 0.1944, Third class: 0.3194, Fourth class: 0.1389, Fifth class: 0.2361

 

      

 

 

2.

The heights in inches of 18 randomly selected adult males in LA are listed as: 70, 69, 72, 57, 70, 66, 69, 73, 80, 68, 71, 68, 72, 67, 58, 74, 81, 72.

1. Display the data in a stem-and-leaf plot.

2. Find the mean.

3. Find the median.

4. Find the mode.

5. Find the range.

6. Find the variance.

7. Find the standard deviation.