Jennifer Drive 265 miles in five hours what is her average rate of speed and miles per hour
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Answer:
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 <em>z</em> 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).