Chegg true, false, or uncertain. in each of the following situations, state whether each statement is true, false, or uncertain, and explain your answer. your score is evaluated on the explanation you provide, therefore, if you do not provide explanation, you will not receive any credit even if you stated true, false, or uncertain correctly. a researcher wants to test h0: x = 30 versus the one sided alternative : x < 30. d. the 95% margin of error for the mean of a normal population with unknown is the same for all srs of size n.

answer: you need the equation in the question so i can answer it

step-by-step explanation:

answer: bea's uncle is 25 years old.

step-by-step explanation:

given the equation , we can say that the variable "x" represents the age of bea's uncle. then to find his age, we need to solve for "x":

we must add 15 to both sides of the equation:

now we need to divide both sides of the equation by 3:

therefore, we can conclude that bea's uncle is 25 years old.

1,407.5 hours

step-by-step explanation:

we first convert all the time to hours and then sum them up.

there are 24 hours in 1 day, in 58 days, there are 24 x 58 = 1,392 hours.

there are 60 minutes in 1 hour, thus, 30 minutes will be equivalent to 30 / 60 = 0.5 hours.

therefore, the number of hours it will take mercury to complete a full rotation is 1,392 + 15 + 0.5 = 1,407.5 hours

the answer is b.

64

step-by-step explanation:

c=2πr=2·π·8≈64