Answer:
Yes, we can conclude that the population standard deviation of TV watching times for teenagers is less than 2.66
Step-by-step explanation:
H0 : σ² = 2.66²
H1 : σ² < 2.66²
X²c = (n - 1)*s² ÷ σ²
sample size, n = 40
Sample standard deviation, s = 1.9
X²c = ((40 - 1) * 1.9²) ÷ 2.66²
X²c = 140.79 ÷ 7.0756
X²c = 19.897
Using a confidence level of 95%
Degree of freedom, df = n - 1 ; df = 40 - 1 = 39
The critical value using the chi distribution table is 25.6954
Comparing the test statistic with the critical value :
19.897 < 25.6954
Test statistic < Critical value ; Reject the Null
Hence, we can conclude that the population standard deviation of TV watching times for teenagers is less than 2.66
If Nico gave away some red circles and you would like to know how many red circles does he have left, you can calculate this using the following step:
Nico has 15 red circles.
n ... the number of red circles that he gave away
15 - n ... the number of circles that Nico still has
The correct result would be 15 - n.
Answer:
C. connect the circles together using the compass tool
Step-by-step explanation:
Answer:
Volume = 18 * pi in^3 OR IF pi=3.14 THEN Volume = 56.52 in^3
Step-by-step explanation:
Volume = Area(circle) * Height
Volume = pi*(diameter/2)^2 *Height
Volume = pi* 2.25 * 8
Volume = 18 * pi in^3
And if pi=3.14 then:
Volume = 56.52 in^3
Answer:
x=10
Step-by-step explanation:
Pull out like factors :
-9x + 90 = -9 • (x - 10)
Equations which are never true:
2.1 Solve : -9 = 0
This equation has no solution.
A a non-zero constant never equals zero.
Solving a Single Variable Equation:
2.2 Solve : x-10 = 0
Add 10 to both sides of the equation :
x = 10
