Answer:
Step-by-step explanation:
Circle r=c/2pi
Solve for radius
r≈31.99
Circumference
201
Sove the system:
x: Mary´s age
y: Mom´s age:
x + y = 67
3x + 7 = y
Replace y in the first equation:
x + 3x + 7 = 67
4x = 67 - 7
4x = 60
x = 15 yrs.
y = 67 - 15 = 52 yrs
Answer:
Ordinal Variables
Step-by-step explanation:
Ordinal level of variable measurement is the level of measurement that depicts high level of ordered relationship among the variable’s observations.
The ordinal level of measurement indicates an ordering of the measurements.
This type of variable have a meaningful order to them. An example is class grade (with possible values of Excellent, Very Good, Good, Credit, Fair and Poor).
Another example is the education level (with possible values of high school, undergraduate degree, and graduate degree).
Answer:
The 90% confidence interval is 0.575 to 0.625.
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of , and a confidence interval , 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:
90% confidence interval
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 90% confidence interval is 0.575 to 0.625.