Answer:
11
Step-by-step explanation:please mark brainliest
Answer:
H0 : μ = 0.107
H1 : μ ≠ 0.107
Step-by-step explanation:
The claim is the alternative hypothesis. H1 ; which is a researcher's opinion that the proportion of Americans aged 65 and above using the internet as changed from the mean value of 10.7% (0.107). The direction of the change is not given, hence. We cannot use the greater or less Than sign as the direction of the change isn't specified by the researcher or data Given. Hence, the shift could be either to the right or left. Hence, the use of the equal to and not equal to sign.
The null will oppose the alternative hypothesis and take the stance that the proportion hasn't changed from the initial mean.
One way of calculating decimal sum is by using partition
8.3 = 8 + 0.3
5.2 = 5 + 0.2
4.36 = 4 + 0.3 + 0.06
42.1 = 42 + 0.1
86.0 = 86
Add the units together: 8 + 5 + 4 + 42 + 86 = 145
Add the tenth together: 0.2 + 0.3 + 0.3 + 0.1 = 0.9
Add the hundredth together: 0.06 (we only have one value in hundredth)
Then add all the answers together: 145 + 0.9 + 0.06 = 145.96
Answer 145.96 is correct to two decimal places
If we want to round this answer to correct significant figures, it would depend on how many significant figures are asked.
For example:
145.96 to one significant figure is 100.00
145.96 to two significant figure is 150.00
145.96 to three significant figure is 146.00
and so on
Correct answer: 146.00 (answer is rounded to three significant figures)
Answer:
5. 8
6. 18
Step-by-step explanation:
5.
a(a^2 + a - 1) + 7 =
= a^3 + a^2 - a + 7
For a = -1,
= (-1)^3 + (-1)^2 - (-1) + 7
= -1 + 1 + 1 + 7
= 8
6.
2ab(a + b) - 3ab(a - b) =
= 2a^2b + 2ab^2 - 3a^2b + 3ab^2
= -a^2b + 5ab^2
For a = 1 and b = 2,
= -(1)^2(2) + 5(1)(2)^2
= -1(2) + 5(4)
= - 2 + 20
= 18
