A) enumerable B) continuous C) discrete D) quantitative 7) The amount of time needed to run the Boston marathon is an example of which type of variable? 7) A) discrete B) temporal C) continuous D) qualitative 8) Which one of the following data are continuous? 8) A) the number of musicians performing in the MP3 file B) the number of times the file has been downloaded C) the time remaining for an MP3 music download D) all of these represent continuous data 9) What type of sampling is being employed if the country is divided into economic classes and a sample is chosen from each class to be surveyed? 9) A) cluster sampling B) random sampling C) stratified sampling D) systematic sampling 10) An electronics manufacturer tests every 200th cell phone to verify that it is functioning properly. Identify the kind of sample that is being used. 10) A) simple random sample B) systematic sample C) cluster sample D) stratified sample 11) If a researcher manipulates one of the variables and tries to determine how the manipulation influences other variables, the researcher is conducting 11) A) observational study. B) confounding study. C) independent study. D) experimental study. 12) One advantage of a(n) study is that it occurs in a natural setting without intervention by the researcher. 12) A) experimental B) retrospective C) observational D) natural 13) A recent statistics exam yielded the following 25 scores. Construct a grouped frequency distribution with the class limits shown below.3 67 89 75 54 64 53 83 69 68 92 87 84 43 80 88 76 83 76 98 55 73 80 41 85 95 Class Limits Tally Frequency 41-50 51-60 61-70 71-80 81-90 91-100 13) Total Write the frequencies of the classes from the first to the 6th in order. A) 2, 3, 4, 6, 7, 3 B) 3, 2, 4, 7, 6, 3 C) 2, 2, 5, 6, 7, 3 D) 2, 3, 5, 5, 6, 14) A survey was taken on how much trust people place in the information they read on the Internet. Construct a categorical frequency distribution for the data. A trust in all that they read, M trust in most of what they read, H trust in about one-half of what they read, S trust in a small portion of what they read. Select the correct frequency distribution M M M H M S M M M H M M M M Is M M H H M M M H M s M H H s M M Is M s 14)A) Class Freq Percent A 2 5% M 22 55% H 10 25% S Q E": 40 100% B) D) Class Freq Percent A 2 . M 24 6013 H 8 20% s 9 we 40 1 00% 15) Thirty households were surveyed for the number of televisions in each home. The following are the results. Construct a frequency histogram 2 2 0 1 1 2 0 0 5 2 4 =1 2 1 0 0 0 0 0 D {J 2 l} 0 3 1 1 1 0 U 15)