A researcher claims that on average, high school students sleep less than middle school students. The researcher recorded the sleeping times of 49 middle school students and 55 high school students.
For the middle school students, the mean daily time asleep was 8.0 hours with standard deviation
0.2 hours.
For the high school students, the mean daily time asleep was 7.9 hours with standard deviation
0.5 hours
Conduct a two-sample t-test to test the researcher's claim on the 5% level.

1. 22

2. 1

3. 7

4. 18

step-by-step explanation

e2020 got it right

i need the options

step-by-step explanation:

2. angles qrt and qst both measures 156 degrees.

step-by-step explanation:  

we have been given a diagram of a circle and we are told that measure of arc qvt is 156 degrees.  

we can see from our given diagram that angle qrt and angle qst subtends to arc qvt.

since we know that angles subtended by the same arc at the circumference are always equal.

by angle subtended by same arc theorem, measure of angle qrt and angle qst will be equal to the measure of arc qvt.

therefore, angles qrt and qst both measures 156 degrees and 2nd statement is the correct choice.

answer: 0.64

step-by-step explanation: