Answer:
± 13
Step-by-step explanation:
= ± 13, since
13 × 13 = 169 and - 13 × - 13 = 169
Answer:
360°
Step-by-step explanation:
1+3=180°
2+4=180°
so, ( 1+3)+(2+4)=360°
or:
1+2=180°
3+4=180°
so, so,( 1+2)+(3+4)=360°
Step-by-step explanation:
The equation of line A:
y-1=0, 5x-3
y=0, 5x-2. Hence its gradient is 0,5
For line B, its you intercept is -8, so y=mx-8.
When x = -4, y=-4m -8 =0 as shown in the graph. This means that m = -2.
Since |-2| > |0, 5|, line B is steeper than line A.
Answer:
You will need to sample at least 3108 students.
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
.
In this problem, we have that:

99% confidence level
So
, z is the value of Z that has a pvalue of
, so
.
The margin of error is:

How many students will I need to survey if I want to estimate, with 99% confidence, the true proportion to within 2%?
You need a sample size of at least n.
n is found when M = 0.02. So







You will need to sample at least 3108 students.