10.

A survey asked, "How many tattoos do you currently have on your body?" Of the 1237 males surveyed, 177 responded that they had at least one tattoo. Of the 1068 females surveyed, 138 responded that they had at least one tattoo. Construct a 95% confidence interval to judge whether the proportion of males that have at least one tattoo differs significantly from the proportion of females that have at least one tattoo. Interpret the interval.

Let p1 represent the proportion of males with tattoos and p2 represent the proportion of females with tattoos.

The 95% confidence interval for p1 p2 is ,. (Round to three decimal places as needed.)

Interpret the interval.

A.

There is 95% confidence that the difference of the proportions is in the interval. Conclude that there is a significant difference in the proportion of males and females that have at least one tattoo.

B.

There is a 95% probability that the difference of the proportions is in the interval. Conclude that there is a significant difference in the proportion of males and females that have at least one tattoo.

C.

There is 95% confidence that the difference of the proportions is in the interval. Conclude that there is insufficient evidence of a significant difference in the proportion of males and females that have at least one tattoo.

D.There is a 95% probability that the difference of the proportions is in the interval. Conclude that there is insufficient evidence of a significant difference in the proportion of males and females that have at least one tattoo.

11.Researchers developed a new method of voice recognition (called a remapped network) that was thought to be an improvement over an existing neural network. The data shown in the accompanying table are based on results of their research. Does the evidence suggest that the remapped network has a different proportion of errors than the neural network? Use the = 0.10 level of significance.

4 Click the icon to view the data table.

Does the evidence suggest that the remapped network has a different proportion of errors than the neural network?

No Yes

4: Voice recognition

Neural network

Remapped network

Recognized word (success)

Did not recognize word (failure)

Recognized word (success)

9,326

390

Did not recognize word (failure)

460

29