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BMAL 590 Quantitative Research Techniques and Statistics

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What is Statistics? (section 1) • A sample of 500 athletes is taken from a population of 11,000 Olympic athletes to measure work ethic. As a result we . Can make consistent inferences each time work ethic is the outcome • When data is collected in a statistical study for only a portion or subset of all elements of interest we are using a . Sample Data Collecting and Sampling (section 2) • When a person receives an email questionnaire and places it in their deleted items without responding, they are contributing to . Nonresponse error • The difference between a sample mean and the population mean is called the . Sampling error Introduction to hypothesis Testing (Section 5) • A type I error occurs when we . Reject a true null hypothesis • In a criminal trial where the null hypothesis states that the defendant is innocent, a Type II error is made when . A guilty defendant is found not guilty • The p-value of the test is the . The largest a at which a null hypothesis cannot be rejected Probability (Section 3) • Initial estimates of the probabilities of events are known as . Prior Probabilities • If the outcome of event A is not affected by event B, then events A and B are said to be . Independent • The collection of all possible outcomes of an experiment is called . A sample space • Suppose P(A) = .35. The probability of the complement of A is . .65 Inference about a Population (Section 6) • An unbiased estimator is . A sample Statistic, which has an expected value equal to the value of the population parameter QUIZ Section 1- A company has developed a new smartphone whose average lifetime is unknown. In order to estimate this average, 200 smartphones are randomly selected from a large production line and tested. Their average lifetime is found to be 5 years. 200 smartphones represents a . Sample Which of the following is a measure of reliability of a statistical inference? Significance level The process of using sample statistics to draw conclusions about population parameters is called . Doing inferential statistics Which of the following statements involve descriptive statistics as opposed to inferential statistics? The alcohol, Tobacco and Firearms Department reported that Houston had 1,790 registered gun dealers in 1997. A population of all college applicants exists who have taken the SAT exam in the US in the last year. A parameter of the population are . SAT Scores QUIZ Section 2 -Which of the following statements is true regarding the design of a good survey? The questions should be kept as short as possible -Which method of data collection is involved when a researcher counts and records the number of students wearing backpacks on campus in a given day? Direct Observation -Manager at electronics store wants to know if customers who purchased video recorder over the last 12 months are satisfied with their products. If there are 4 different brands of video recorders made by the company, which sampling strategy would be best to use? Stratified random sample -Which of the following types of samples are almost always biased? Self-selected sampled - is an expected error based only on the observations limited to a sample taken from a population. Sampling error

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