Exam 1: Data Collection

Explain the Various Types of Observational Studies -Researchers wanted to determine whether there was an association between high blood pressure and the suppression of emotions. The researchers looked at 1800 adults enrolled in a Health Initiative Observational Study. Each person was interviewed and asked about their response to emotions. In particular they were asked whether their tendency was to express or to hold in anger and other emotions. The degree of suppression of emotions was rated on a scale of 1 to 10. Each person s blood pressure was also measured. The researchers analyzed the results to determine whether there was an association between high blood pressure and the suppression of emotions.

Determine whether the underlined value is a parameter or a statistic. -51.7% of the residents of Idlington Garden City are female.

Determine whether the underlined value is a parameter or a statistic. -In a survey conducted in the town of Atherton, 25% of adult respondents reported that they had been involved in at least one car accident in the past ten years.

A survey of 1301 American households found that 66% of the households own at least two bicycles. Identify the population, the sample, and the individuals in the study.

Classify the variable as qualitative or quantitative. -the numbers on the shirts of a boy s football team

Determine the sampling technique which is used -A sample consists of every 35th worker from a group of 4000 workers. What sampling technique was used

Explain the Various Types of Observational Studies -A researcher wanted to determine whether colon cancer was associated with eating meat. He selected a sample of 500 men with colon cancer and an equal number of men without colon cancer. The two groups were matched - in other words they were similar in terms of age, occupation, income, and exercise levels. Histories on the amount of meat consumed over the previous twenty years were obtained for all men. The total amount of meat that each man eaten in the previous twenty years was estimated. The meat consumption was compared for the two groups.

Determine whether the quantitative variable is discrete or continuous. -the number of phone calls to the police department on any given day

Determine the Level of Measurement of a Variable -the medal received (gold, silver, bronze) by an Olympic gymnast

Describe the Characteristics of an Experiment -The object upon which the response variable is measured is called ________ .

Determine whether the underlined value is a parameter or a statistic. -Telephone interviews of 394 employees of a large electronics company found that 65% were dissatisfied with their working conditions.

Determine whether the quantitative variable is discrete or continuous. -the number of pills in an aspirin bottle

Determine whether the underlined value is a parameter or a statistic. -Mark retired from competitive athletics last year. In his career as a sprinter he had competed in the 100 -meters event a total of 328 times. His average time for these 328 races was 10.27 seconds.

Determine the Level of Measurement of a Variable -capacity of a backpack

Explain the Steps in Designing an Experiment -What is a factor

Determine whether the quantitative variable is discrete or continuous. -the age of the oldest employee in the data processing department

Explain the Completely Randomized Design -A drug company wanted to test a new depression medication. The researchers found 600 adults aged 25-35 and randomly assigned them to two groups. The first group received the new drug, while the second received a placebo. After one month of treatment, the percentage of each group whose depression symptoms decreased was recorded and compared. What is the response variable in this experiment

Determine whether the underlined value is a parameter or a statistic. -A study of 1800 college students in the city of Pemblington found that 6% had been victims of violent crimes.