4. Table 1.7 shows data for eight cordless telephones (Consumer reports, Novembe

Question

4. Table 1.7 shows data for eight cordless telephones (Consumer reports, November 2012). The Overall Score, a measure of the overall quality for the cordless telephone, ranges from 0 to 100 Voice Quality has possible ratings of poor, fair, good, very good, and excellent. Talk Time is the manufacturer's claim of how long the handset can be used when it is fully charged. a. How many elements are in this data set? b. For the variables Price, Overall Score, Voice Quality, Handset on Base, and Talk Time, which variables are categorical and which variables are quantitative? c. What scale of measurement is used for each variable? TABLE 1.7 DATA FOR EIGHT CORDLESS TELEPHONES Overal Handset Talk Time Model Price ($) Score Voice Quality on Base (Hours) CL84100 Yes 80 100 70 45 80 60 70 78 72 70 73 Excellent Very Good Very Good Very Good Very Good Very Good Excellent Very Good AT&T; TL92271 13 13 10 7 . Panasonie 4773B Yes No Panasonic 65921 Uniden D2997 UnidenD1788 Yes DS6521 CS6649 4. Refer to the data set in Table 1.7. a. What is the average price for the cordless telephones? b. What is the average talk time for the cordless telephones? of the cordless telephones have a voice quality of excellent? d. What percentage of the cordless telephones have a handset on the base?

Explanation / Answer

(a) There are 8 elements in the data set.

(b) Voice Quality and Handset on Base are categorical and Price, Overall Score and Talk Time are quantitative.

(c) Price, Overall Score and Talk Time are Ratio scale. Voice Quality is Ordinal scale and Handset on Base is Nominal Scale.

4. (a) average price = (60 + 80 + 100 + 70 + 45 + 80 + 60 + 50)/8 = 68.125.
(b) average talk time = (7 + 7 + 13 + 13 + 10 + 7 + 7 + 7)/8 = 8.875 Hours.
(c) Percentage of excellent = (2/8) * 100% = 25%.
(d) Percentage of handset on base = (4/8) * 100% = 50%.

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