Exam 5: Data Collection and Sampling

Soft Drinks ​ A soft drink manufacturer has been supplying its products in bottles to grocery stores and in cans to small convenience stores.The company is analyzing sales of this product to determine which type of packaging is preferred by customers. ​ ​ -{Soft Drink Narrative} Outline a better method for designing this study,so the same types of stores don't get the same types of packaging.

A simple random sample is chosen in such a fashion that every possible subset of the same size has an equal chance of being selected.

The response rate of a survey is the proportion of all people who were selected but did not complete the survey.

A sampling error can be reduced by taking a larger sample size.

​Direct observation is a better way to collect information than Experimental designs.

The difference between a sample mean and the population mean is called:

Sampling error refers to the difference between the sample and the population that exists only because of the observations that happened to be selected for the sample.

A(n)____________________ sample is obtained by separating the population into groups and taking a simple random sample from each group.

In a self-administered survey,the individuals in the sample are typically contacted by ____________________.

A pharmaceutical company interested in measuring how often physicians prescribe a certain drug has selected a simple random sample from each of two groups: M.D.(Medical Doctors)and D.O.(Osteopaths).What is this type of sampling called?

Which of the following causes sampling error?

Which of the following is an example of a nonsampling error?

The target population is the population about which we want to draw inferences and conclusions,while the sampled population is the actual population from which the sample has been taken.

A senator wants to estimate the mean age of registered voters in her state.Unfortunately,she does not have a complete list of households in her state.Describe a sampling plan that would be suitable for her purposes.

Which of the following types of samples should not be used to make good statistical inferences from a sample to a population?

A self-selected sample represents the sampled population but not the target population.

A self-selected sample is the group of individuals who were randomly selected to be in the sample,then agreed to participate in the study.

Describe the difference between an observational study and an experimental study.

Briefly describe three types of nonsampling errors.

In a(n)____________________ study,individuals are randomly assigned to different treatments and the results are compared.