Answer:
(65.5775 , 72.2225)
Step-by-step explanation:
Confidence Interval is the range around sample mean, likely to consist the population parameter.
Formula = x' <u>+</u> z (s / √n)
= 68.9 <u>+</u> 2.5 (8.3 / √39)
= 68.9 <u>+</u> 3.3225
(65.5775 , 72.2225)
Use this website: https://www.angio.net/personal/climb/speed.html
Answer:
0.293263 rounded to the ten thousandths place
=0.2933
The equation would be y = 60x + 20
