Find a 90% confidence interval for the mean number of hours a child plays a video game per day, if a random sample of 43 children has a mean of 3.25 hours and a population standard deviation of 1.75 hours.

1. The margin of error is:

0.01

0.07

0.44

0.34

2. The 90% confidence interval is:

(2.81, 3.69)

(2.91, 3.59)

(3.18, 3.32)

(3.24, 3.26)

3. Interpret the interval

a. For a confidence level of 90%, the true value of the average hours that a child plays video games is between 3.24 and 3.26

b. For a confidence level of 90%, the true value of the average hours that a child plays video games is between 3.18 and 3.32

c. For a confidence level of 90%, the true value of the average hours that a child plays video games is between 2.81 and 3.69

d. For a confidence level of 90%, the true value of the average hours that a child plays video games is between 2.91 and 3.59