Exam 1: Introduction to Statistics

Determine whether the given value. -After inspecting all of 55,000 kg of meat stored at the Wurst Sausage Company, it was found that 45,000 kg of the meat was spoiled.

Provide an appropriate response. -Define continuous and discrete data and give an example of each.

Provide an appropriate response. -At a school there are two different math classes of the same age. The two classes have different teachers. The school principal is interested in gauging the effectiveness of two different teaching methods and asks each teacher to try one of the methods. At the end of the semester both classes are given the same test and the results are compared. In this experiment, what is the variable of interest? Give some examples of variables which could be confounding variables.

Determine which of the four levels of measurement is most appropriate. -Nationalities of survey respondents.

Use critical thinking to address the key issue. -You plan to make a survey of 200 people. The plan is to talk to every 10th person coming out of the school library. Is there a problem with your plan?

Use critical thinking to address the key issue. -A researcher published this survey result: "74% of people would be willing to spend 10 percent more for energy from a non-polluting source". The survey question was announced on a national radio show and 1,200 listeners responded by calling in. What is wrong with this survey?

Identify the type of observational study -A doctor performs several diagnostic tests to determine the reason for a patient's illness.

Use critical thinking to address the key issue. -An employee at the local ice cream parlor asks three customers if they like chocolate ice cream.

Identify the number -A health and fitness club surveys 40 randomly selected members and found that the average weight of those questioned is 157 lb.

which of these types of sampling is used -A tax auditor selects every 1000th income tax return that is received.

Provide an appropriate response. -A teacher at a school obtains a sample of students by selecting a random sample of 20 students from each grade. What kind of sampling is being used here? Will the resulting sample be a simple random sample of the population of students at the school? Explain your thinking.

Identify the type of observational study -Researchers collect data by interviewing athletes who have won olympic gold medals from 1980 to 1992.

Determine which of the four levels of measurement is most appropriate. -A political pollster reports that his candidate has a 10% lead in the polls with 10% undecided.

Identify the number -The number of stories in a Manhattan building is 22.

which of these types of sampling is used -A sample consists of every 49th student from a group of 496 students.

Identify the type of observational study -A statistical analyst obtains data about ankle injuries by examining a hospital's records from the past 3 years.

Determine which of the four levels of measurement is most appropriate. -The subjects in which college students major.

Determine whether the given value. -A sample of 120 employees of a company is selected, and the average age is found to be 37 years.

Identify the number -The number of freshmen entering college in a certain year is 621.

Provide an appropriate response. -Define observational study and experiment. Define the terms "treatment group" and "control group" as part of your answer.