Exam 4: How to Get a Good Sample

The __________ can be applied to any percent reported regarding the sample to find an estimate of the percent of the population that would respond in the same way.

What is a probability sampling plan?

Suppose a recent election exit pollster reports that "Forty-eight percent of the voters polled said they voted for Candidate A.The margin of error for this survey is plus or minus 2.5 percentage points." Assume the exit poll was designed and conducted correctly.What percentage of all voters do you expect to vote for Candidate A? Give the most complete answer you can.

For Questions use the following narrative Narrative: Boat show The annual Vacation & Boat Show in Columbus, Ohio offers four types of attractions: boats, fishing gear, outdoor equipment, and vacation planning services.Tickets sell for $6 per person, and children under 5 get in free.This year the show organizers want to find out which attraction was most popular, so they surveyed 100 people at random who attended the show, and asked them.The results showed that 67% of them liked the boats best. -{Boat show narrative} This study is an example of which type of research strategy?

If you tried to phone someone who was selected to participate in a telephone survey, and you couldn't reach that person the first time, what should you do?

Which of the following is not an example of a common type of research strategy as discussed in your textbook?

Explain what is wrong with a poll conducted on a TV news program that asks viewers to call in with their opinion.

What type of study takes place when the sample is equal to the population?

For Questions use the following narrative Narrative: Apartment complex Suppose you want to survey the opinions of the residents of an apartment complex.The complex contains 100 buildings, each with 8 units per building, for a total of 800 units.You decide to sample 160 of the units. -{Apartment complex narrative} Suppose you randomly sample 20 buildings, and then select every unit in those 20 buildings to be in your sample, for a total of 160 units.What sampling method did you use?

In an experiment, you measure the result of the feature being manipulated, called the __________ variable, on an outcome, called the __________ variable.

Explain why it is so important that researchers report the response rates for their surveys.

For Questions use the following narrative Narrative: Boat show The annual Vacation & Boat Show in Columbus, Ohio offers four types of attractions: boats, fishing gear, outdoor equipment, and vacation planning services.Tickets sell for $6 per person, and children under 5 get in free.This year the show organizers want to find out which attraction was most popular, so they surveyed 100 people at random who attended the show, and asked them.The results showed that 67% of them liked the boats best. -{Boat show narrative} Is there a practical and accurate way to get a sampling frame for this population? If yes, explain how.If no, explain why not.

For Questions use the following narrative Narrative: Boat show The annual Vacation & Boat Show in Columbus, Ohio offers four types of attractions: boats, fishing gear, outdoor equipment, and vacation planning services.Tickets sell for $6 per person, and children under 5 get in free.This year the show organizers want to find out which attraction was most popular, so they surveyed 100 people at random who attended the show, and asked them.The results showed that 67% of them liked the boats best. -{Boat show narrative} Specify who/what the units are in this study.

What is the margin of error?

Suppose you want to find out what percentage of students at your university would pay extra fees for the use of a new recreation center, and you want a simple random sample of 100 students.Suppose you go to the current recreation center and ask every 10th student who comes in the door to participate in your survey, until you have 100 people.Does this method of sampling give you a simple random sample? Explain your answer.

What is the most important limitation of a case study?

With a (an) __________ sample, everyone in the population must have a specified chance of making it into the sample.

For Questions use the following narrative Narrative: Valentine spending Suppose you want to find out how much money each adult will spend on Valentine's Day this year, on average. -{Valentine spending narrative} Suppose you are a DJ of a local radio station, so you ask people to call in with their responses.What type of sample are you getting here?

Which of the following situations could cause bias in the results of a telephone survey?

What two things do you need in order to produce a simple random sample from the population?