Читать книгу Statistics and Probability with Applications for Engineers and Scientists Using MINITAB, R and JMP - Bhisham C. Gupta, Irwin Guttman - Страница 46

1 Describe briefly the difference between a sample and a population. Give an example of a population and a sample.

2 Describe the difference between descriptive statistics and inferential statistics.

3 A university professor is interested in knowing the average GPA of a graduating class. The professor decided to record the GPA of only those students who were in his/her class during the last semester before graduation. Using this information (the data), the professor estimates the average GPA of the graduating class using the average of the GPAs he/she collected. Describe the following:Population of interestSample collected by the professorThe variable of interest

4 Describe whether each of the following scenarios would result in qualitative or quantitative data:Time needed to finish a project by a technicianNumber of days of stay in a hospital by a patient after bypass surgeryAverage number of cars passing through a toll booth each dayTypes of beverages served by a restaurantSize of a rod used in a projectCondition of a home for sale (excellent, good, fair, bad)Heights of basketball playersDose of medication prescribed by a physician to his/her patientsRecorded temperatures of a tourist place during the month of JanuaryAges of persons waiting in a physician's officeSpeed of a vehicle crossing George Washington Bridge in New YorkAmount of interest reported in a tax returnSizes of cars available at a rental company (full, medium, compact, small)Manufacturers of cars parked in a parking lot

5 Referring to Problem 4, classify the data in each case as nominal, ordinal, interval, or ratio.

6 A consumer protection agency conducts opinion polls to determine the quality (excellent, good, fair, bad) of products imported from an Asian country. Suppose that the agency conducted a poll in which 1000 randomly selected individuals were contacted by telephone.What is the population of interest?What is the sample?Classify the variable of interest as nominal, ordinal, interval, or ratio.