New Automobile Owners Survey. J.D. Power and Associates surveys new automobile owners to learn about the quality of recently purchased vehicles. The following questions were asked in the J.D. Power Initial Quality Survey.

e. What is your overall rating of your new vehicle? (1- to 10-point scale with 1 Unacceptable and 10 Truly Exceptional)

$$\begin{array}{llcclr} \text { Brand } & \text { Model } & \text{ Price (\$) } & \text { Overall Score } & \text { Voice Quality } & \text { (hours) } \\ \text { AT\&T } & \text { CL84100 } & 60 & 73 & \text { Excellent } & 7 \\ \text { AT\&T } & \text { TL92271 } & 80 & 70 & \text { Very Good } & 7 \\ \text { Panasonic } & 4773 \text { B } & 100 & 78 & \text { Very Good } & 13 \\ \text { Panasonic } & \text { 6592T } & 70 & 72 & \text { Very Good } & 13 \\ \text { Uniden } & \text { D2997 } & 45 & 70 & \text { Very Good } & 10 \\ \text { Uniden } & \text { D1788 } & 80 & 73 & \text { Very Good } & 7 \\ \text { Vtech } & \text { DS6521 } & 60 & 72 & \text { Excellent } & 7 \\ \text { Vtech } & \text { CS6649 } & 50 & 72 & \text { Very Good } & 7 \end{array}$$

New Automobile Owners Survey. J.D. Power and Associates surveys new automobile owners to learn about the quality of recently purchased vehicles. The following questions were asked in the J.D. Power Initial Quality Survey.

d. What is your average number of miles per gallon?

$$\begin{array}{llcclr} \text { Brand } & \text { Model } & \text{ Price (\$) } & \text { Overall Score } & \text { Voice Quality } & \text { (hours) } \\ \text { AT\&T } & \text { CL84100 } & 60 & 73 & \text { Excellent } & 7 \\ \text { AT\&T } & \text { TL92271 } & 80 & 70 & \text { Very Good } & 7 \\ \text { Panasonic } & 4773 \text { B } & 100 & 78 & \text { Very Good } & 13 \\ \text { Panasonic } & \text { 6592T } & 70 & 72 & \text { Very Good } & 13 \\ \text { Uniden } & \text { D2997 } & 45 & 70 & \text { Very Good } & 10 \\ \text { Uniden } & \text { D1788 } & 80 & 73 & \text { Very Good } & 7 \\ \text { Vtech } & \text { DS6521 } & 60 & 72 & \text { Excellent } & 7 \\ \text { Vtech } & \text { CS6649 } & 50 & 72 & \text { Very Good } & 7 \end{array}$$

Economy worries. During the week of April 15, 2013, a Gallup Poll requested 1500 U.S. adults, aged 18 or over, how they rated economic conditions. Only $17 \%$ rated the economy as Excellent/Good. Make a $95 \%$ confidence interval for the true proportion of Americans who rated the U.S. economy as Excellent/Good.

New Automobile Owners Survey. J.D. Power and Associates surveys new automobile owners to learn about the quality of recently purchased vehicles. The following questions were asked in the J.D. Power Initial Quality Survey.

b. What price did you pay?

$$\begin{array}{llcclr} \text { Brand } & \text { Model } & \text{ Price (\$) } & \text { Overall Score } & \text { Voice Quality } & \text { (hours) } \\ \text { AT\&T } & \text { CL84100 } & 60 & 73 & \text { Excellent } & 7 \\ \text { AT\&T } & \text { TL92271 } & 80 & 70 & \text { Very Good } & 7 \\ \text { Panasonic } & 4773 \text { B } & 100 & 78 & \text { Very Good } & 13 \\ \text { Panasonic } & \text { 6592T } & 70 & 72 & \text { Very Good } & 13 \\ \text { Uniden } & \text { D2997 } & 45 & 70 & \text { Very Good } & 10 \\ \text { Uniden } & \text { D1788 } & 80 & 73 & \text { Very Good } & 7 \\ \text { Vtech } & \text { DS6521 } & 60 & 72 & \text { Excellent } & 7 \\ \text { Vtech } & \text { CS6649 } & 50 & 72 & \text { Very Good } & 7 \end{array}$$

New Automobile Owners Survey. J.D. Power and Associates surveys new automobile owners to learn about the quality of recently purchased vehicles. The following questions were asked in the J.D. Power Initial Quality Survey.

a. Did you purchase or lease the vehicle?

The table shows data for eight cordless telephones (Consumer Reports, November 2012). The Overall Score, a measure of the overall quality of 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.

d. What percentage of cordless telephones have a handset on the base?

Summarizing Phone Data. Refer to the data set in Table 1.7.

a. What is the average price for the phones?

The table shows data for eight cordless telephones (Consumer Reports, November 2012). The Overall Score, a measure of the overall quality of 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.

c. What percentage of cordless telephones have a voice quality of excellent?

Comparing Phones. Table $1.7$ shows data for eight phones (Consumer Reports). The Overall Score, a measure of the overall quality for the phone, 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 phone can be used when it is fully charged.

a. How many elements are in this data set?

The table shows data for eight cordless telephones (Consumer Reports, November 2012). The Overall Score, a measure of the overall quality of 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.

b. What is the average talk time for cordless telephones?

The table shows data for eight cordless telephones (Consumer Reports, November 2012). The Overall Score, a measure of the overall quality of 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. What is the average price for cordless telephones?

The table shows data for eight cordless telephones (Consumer Reports, November 2012). The Overall Score, a measure of the overall quality of 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.

c. What scale of measurement is used for each variable?

Tablet PCs: Cost, CPU, and Operating System. Refer to Table 1.6.

d. What percentage of tablets use an Android operating system?

The table shows data for eight cordless telephones (Consumer Reports, November 2012). The Overall Score, a measure of the overall quality of 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.

b. For the variables Price, Overall Score, Voice Quality, Handset on Base, and Talk Time, which variables are categorical and which variables are quantitative?