Answer:
The point estimate for the proportion is p = 0.4725
The 95% confidence interval for the proportion of non-fatal accidents that involved the use of a cell phone is (0.4236, 0.5214).
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of , we have the following confidence interval of proportions.
In which
z is the zscore that has a pvalue of .
For this problem, we have that:
Point estimate
95% confidence level
So , z is the value of Z that has a pvalue of , so .
The lower limit of this interval is:
The upper limit of this interval is:
The 95% confidence interval for the proportion of non-fatal accidents that involved the use of a cell phone is (0.4236, 0.5214).
Answer:
$162.75
Step-by-step explanation:
8.5% = 0.085
12.75 / 0.085 = 150 (price before tax)
150 + 12.75 = 162.75
C because PEMDAS
(Please excuse my dear aunt sally)
Answer:
y= 1/4i
Step-by-step explanation:
y^2+7y= -4
y+7y= 2i
8y=2i
y= 2/8i
y=1/4i
By making each of these a decimal, it's easier to see which are bigger or smaller
2.1, 2 2/5, 2 1/2, 2.6, 2.95
2 2/5 = 2.4
2 1/2 = 2.5