To monitor security, IU Police are surveying the number of students in the Atwater Parking Garage each 30 minutes for a 24-hour period, to help determine when patrols would be most helpful to students. The number of students in the lot is an example of
|A)||a categorical random variable.|
|B)||a continuous random variable.|
|C)||a discrete random variable.|
Which of the following represents an ordinal level of measurement or data?
|A)||Fish, Cats, Dogs|
|B)||1:00, 2:00, 3:00|
|C)||Nominal, Ordinal, Interval|
|D)||Basketball Jersey numbers 23, 33, 43|
A survey was mailed to a total of 400 students; 100 were randomly selected from each of the freshman, sophomore, junior and senior classes last semester. What sampling method was used?
|D)||simple random sample|
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)||Simple random sample.|
Which of the following is true?
|A)||Complete populations are often inaccessible.|
|B)||We use samples because we want absolute accuracy.|
|C)||We usually have plenty of time to do a study.|
|D)||If a population is large, it is usually better to obtain statistical information from the entire population.|
Which statement is false?
|A)||Random dialing phone surveys have low response and are poorly targeted.|
|B)||Selection bias means that many respondents dislike the interviewer.|
|C)||Simple random sampling requires a list of the population.|
|D)||Web surveys are economical but suffer from non-response bias.|
Which variable is least likely to be regarded as ratio data?
|A)||Length of time required for a randomly-chosen vehicle to cross a toll bridge (minutes).|
|B)||Weight of a randomly-chosen casting in a foundry (kilograms).|
|C)||Number of fatalities in a randomly-chosen airline disaster (persons).|
|D)||Supervisor's rating of a randomly-chosen employee's performance (Likert scale).|
Which of the following is quantitative data?
|B)||The brand of cell phone you own.|
|C)||Whether or not you have an American Express card.|
|D)||The fuel economy (MPG) of your car.|
Your rating of the food served on your most recent airline flight (using a scale of 0 = gross, 1 = decent, 2 = yummy) is ___________ data.
Which statement is correct?
|A)||Likert scales are interval only if scale distances are meaningful.|
|B)||Cross-sectional data are measured over time (e.g., by year, month, etc.).|
|C)||A census is preferable to a sample for most business problems.|
|D)||Stratified samples are usually cheaper than other methods.|
Which is most nearly correct regarding sampling error?
|A)||It can be eliminated by increasing the sample size.|
|B)||It can be eliminated by using Excel's =RANDBETWEEN function.|
|C)||It can be eliminated by utilizing systematic random sampling.|
|D)||It cannot be eliminated because of the nature of sampling.|
A hospital selects thirty patient folders from a filing cabinet containing 812 patient folders by choosing every 27th patient folder. Which sampling method is this?
|A)||Simple random sample.|
Which is a time series?
|A)||The M1 component of the U.S. money supply (n = 20 quarters).|
|B)||The unemployment rates for the U.S. states (n = 50 states).|
|C)||The Gross Domestic Product for the E.U. members (n = 15 nations).|
|D)||The inflation rate for housing in U.S. metropolitan areas (n = 46 cities).|