Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 5.2 parts/million (ppm). A researcher believes that the current ozone level is not at the normal level. The mean of 9 samples is 4.7 ppm with a standard deviation of 1.1. Does the data support the claim at the 0.1 level? Assume the population distribution is approximately normal. Specify if the test is one-tailed or two-tailed.

450 is the final answer! : )

28

step-by-step explanation:

8+8+6+6

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.

the answer is  

a.

28 ft2

step-by-step explanation: