Question

Secion 1:Terminolagy&Variables Practice Problems descriptive or inferential statist For Exercises 1-3, determine whether the statement is an example of ) The average salary of a randon sample of S0 high school teachers in 2010 was $5 2) The average Amazon.com rating of the book The Complete Idiot's Guide to Statist tics by 26 reviewers is 4.6 on a scale of I to 5 3) Based on Nielsen ratings, the average American viewer watches 151 hours of TV per month. For Exercises 4-9, classify each variable as qualitative or quantitative and quantitative variables as discrete or ) The number of off-road vehicles sold in the United States 5) A person's hair color 6) Zip codes of cities in New Mexico 7) SAT scores of high school graduates 8) The amount of time it takes a runner to finish the Boston marathon 9) Restaurant ratings of poor, avernge, good, and excellent. For Exercises 10-14, give the boundaries for each data value (including units). 10) 30.132 meters 11)-9.20 degrees 12) 2.11 yards 13) 9 inches 14) 0.5 miles For Exercises 15-20, classify 15) The number of off-road vehicles sold in the United States 16) A person's hair color 17) Zip codes of cities in New Mexico each variable as nominal, ordinal, interval, or ratio level. 18) SAT scores of high school graduates 19) The amount of time it takes a runner to finish the Boston marathon 20) Restaurant ratings of poor, average, good, and excellent.

Answer 1

Sol: Descriptive statistics focuses on description of the sample and often using numbers to summarise the observations of a sample whereas inferential statistics derives conclusion about the population based on the sample statistics. So, we can say the following:

1) This is descriptive statistics as the sample data has been summarized using the mean.

2) Descriptive statistics as the sample data has been summarized.

3) Inferential statistics as observations from a sample have been extended to the population.

4) The number of off-road vehicles sold in the United States is a discrete quantitative variable as it can only take positive integral values.