Question

@florisalreadytaken

Answer 1

\(\Large \text{CI} = \bar{x} \pm z \frac{s}{\sqrt{n}} \)

survey of 1000 teens means n = 1000
mean of 20 --> \( \bar{x} = 20\)

Z for 95% is 1.960
SD or s in the formula is 2 hours

Answer 2

Just plug and chug

Answer 3

You don't even have to do the math. Just look at your answer choices.

You know that the confidence interval is the mean plus or minus some number

so the correct answer choice should reflect a range that has the mean included in it

Answer 4

xdxd thank you <3

Answer 5

That is correct :)

Good job!!