A researcher wants to estimate the mean number of hours spent on required athletic activities by all student-athletes in the conference. How large of a sample should be selected if the researcher wants to be 95% confident that the sample mean is within 0.5 hour of the population mean? From past data the standard deviation is σ = 2.3.

In the past, professional baseball was played at the astrodome in houston, texas. the astrodome has a maximum height of 63.4 m. the height of a baseball t seconds after it is hit straight up in the air with a velocity of 45 ft/s is given by h = -9.8t2 + 45t + 1. will a baseball hit straight up with this velocity hit the roof of the astrodome? use the discriminant to explain your answer.

In the equations, a and b represent the price per night for a room in hotel a and hotel b, respectively, w weeks after september 1 last autumn. what was the price per night in hotel a when it was equal to the price per night in hotel b? a = 240 − 20w b = 320 − 30w

Which choice represents the sample space ,s for this event