In an isosceles triangle, the longest side measures c units. The other sides of the triangle measure a units. Which equation can
2 answers:
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Answer:
This means that the first interval, with 9000 viewers, is 3 times as narrower as the second interval, with 1000 viewers.
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 .
The width of the interval is:
In this sample:
Two 90% intervals, with different lenghts. So both have the same values for z an
Interval A:
9000 viewers.
So the width is
Interval B:
100 viewers
So the width is
Relationship between the widths:
This means that the first interval, with 9000 viewers, is 3 times as narrower as the second interval, with 1000 viewers.
Answer:
Step-by-step explanation:
Hello!
Given the variables
X: Curfew of middle school students (Categorized Yes/No)
Y: Average grade of middle school students. (Categorized: A, B, C, and D)
The objective is to test if there is an association between both variables, you have to conduct a Chi-Square test of independence.
In the null hypothesis, you state that both variables are independent vs. the alternative hypothesis that the variables are dependent.
The hypotheses for this test are:
H₀: Pij= Pi. * P.j i= (1)Yes, (2)No; j= (1)A, (2)B, (3)C, (4)D
H₁: Te variables are not independent.
α: 0.05
Where
Oij is the observed frequency for the i-row and j-column
Eij is the expected frequency for the i-row and j-column
r= number of categories in the rows
c= number of categories in the columns
p-value: 0.687
The p-value is greater than the significance level, so the decision is to not reject the null hypothesis. So using a 5% significance level, you can conclude that having a curfew and the average grades of middle schoolers are two independent variables.
