Answer:
At least 9604 drivers need to be surveyed to be 95% confident that the population proportion is estimated to within 0.01.
If confidence level is chosen higher than 95% then minimum sample size requried in the survey increases
Step-by-step explanation:
The following formula is used to compute the minimum sample size required to estimate the population proportion within the required margin of error:
n≥ p×(1-p) × where
- p is the population proportion who always buckle up before riding in a car (estimated as 0.5 when unknown)
- z is the corresponding z-score for 95% confidence level (1.96)
- ME is the margin of error in the estimation (0.01)
Then,
n≥0.5×0.5 × ≈ 9604
If confidence level is chosen higher than 95% then the z value in the equation would be bigger than 1.96. Therefore minimum sample size requried in the survey increases.
Xy = -10/ 4
= -2.5
So, xy = -2.5
C.
You distribute both the 2 and the -, combine like terms, add three to both sides and then divide out the 3 from 3 on both sides
Answer:
A. 1.5 seconds
B. 36 feet
C. 0 feet
D. After 3 seconds
Step-by-step explanation:
I graphed it on desmos.
As I see here, those should equal 180 together. Detailed calculation is provided in the attachment. If we solve for x the answer is 40. Please see the attachment for details.