Is the study observational or experimental

Reference no: EM13337863

A pharmaceutical company conducted a study to evaluate theeffectiveness and safety of a new inhaled form of insulin for thetreatment of diabetes. A group of 650 diabetics was given thedrug twice a day, while another group of 650 diabetics was given aninhaled placebo twice a day. Insulin levels were checkedperiodically; and the participants were asked to report any adverseside effects (nose bleeds, respiratory infections, nausea,etc.). (14 points)
- What is the population?
- What is the sample?
- Is the study observational or experimental? Explain.
- What are the independent and dependent variables?
- For each of the variables identified in part d, what level ofmeasurement was used to obtain data from these variables?
- Classify the variables identified in part d as either attributeor numerical.
- What parameter(s) best characterize the effectiveness andsafety of the drug?
Identify each of the following as examples of nominal, ordinal,discrete, or continuous variables: (6 points)
- The length of time required for a new epoxy adhesive toharden
- A telephone poll of consumers asking which cola drink theyprefer
- The number of female students attending a university
- The finishing order of horses in a race
- The braking distance of a car on icy pavement
- The number of crimes in a particular neighborhood permonth
Based on your lecture readings, identify and describe—inyour own words—the four levels of measurement. Provideexamples of each. (4 points)
Construct a frequency distribution table to organize thefollowing set of quiz scores: (5 points)
2

8

7

3

5

2

1

1

5

9

4

5

6

7

1

2

8

9

1

6

10
Construct a grouped frequency distribution for the following 28scores using a class width of 4. (5 points)
19

18

11

21

19

15

22

25

12

28

20

20

15

17

20

32

14

20

17

30

27

27

22

24

27

14

13

15
Identify the sampling technique used to obtain a sample in eachof the following. Explain why you chose the sampling technique youdid for each. (10 points)
- Patients at a local hospital are classified according to theirage. Then a random sample of 10 patients from each age group isselected.
- The first 100 people leaving a mall are asked their preferencesfor fast food
- A nation is divided into regions based on telephone area codes.A random sample of 10 area codes is selected.
- Every 10th MP3 player coming off an assembly line is checkedfor defects
- Lottery winners are selected using sequences drawn from arandom number generator

Reference no: EM13337863

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