Exam 2: Data Collection

The Centers for Disease Control and Prevention (CDC)wants to estimate the average extra hospital stay that occurs when heart surgery patients experience postoperative atrial fibrillation.They divide the United States into nine regions.In each region,hospitals are selected at random within each hospital size group (small,medium,large).In each hospital,heart surgery patients are sampled according to known percentages by age group (under 50,50 to 64,65 and over)and gender (male,female).This procedure combines which sampling methods?

A Likert scale

The type of statistical test that we can perform is independent of the level of measurement of the variable of interest.

A valid survey is one that

Automobile exhaust emission of CO2 (milligrams per mile)is ________ data.

The daily closing price of Apple stock over the past month would be a time series.

Professor Hardtack chose a sample of 7 students from his statistics class of 35 students by picking every student who was wearing red that day.Which kind of sample is this?

A good Likert scale may not have

Sampling error is avoidable by choosing the sample scientifically.

A sampling frame is used to identify the target population in a statistical study.

A list of the salaries,ages,and years of experience for 50 CEOs is a multivariate data set.

Thirty work orders are selected from a filing cabinet containing 500 work order folders by choosing every 15th folder.Which sampling method is this?

Which of the following is not true?

Which of the following is false?

If you randomly sample 50 students about their favorite places to eat,the data collected would be referred to as cross-sectional data.

Which is least likely to be regarded as a ratio variable?

Judgment sampling and convenience sampling are nonrandom sampling techniques.

A problem with nonrandom sampling is that

What kind of sampling method would you suggest in order to tabulate the number of formulas on a typical page of the Doane-Seward textbook? Defend your choice.

Which statement is correct?