A survey of 1060 randomly selected US teens ages 13 to 17 found that 605 of them say they have made a new friend online

The 90% confidence interval for the proportion of all US teens who have made a new friend online is (0.55, 0.60).

Step-by-step explanation:

The complete question is:

A survey of 1060 randomly selected US teens ages 13-17 found that 605 of them say they have made a new friend online.  Find and interpret a 90% confidence interval for the proportion, p, of all US teens who have made a new friend online.

Solution:

In a sample of 1060 randomly selected US teens ages 13 to 17, 605 said they have made a new friend online.

Compute the sample proportion of US teens ages 13 to 17 who said they have made a new friend online as follows:

The (1 - α)% confidence interval for population proportion is:

The critical value of z for 90% confidence interval is:

*use a z-table.

Compute the 90% confidence interval for the proportion of all US teens who have made a new friend online as follows:

Thus, the 90% confidence interval for the proportion of all US teens who have made a new friend online is (0.55, 0.60).

1. d.90

2. e. none of these (80)

3. a. 0

4. b. 6

5. e. none of these (10)

6. a. 5

a line is an defined derm because it

a)contains an infinite number of points b) can be used to create other geometric shapes c)describes something that does not have width or depth d) is a term that does not have a formal definition. a line is an undefined term because it: contains an infinite number of points.