Answer:
Step-by-step explanation:
This is a normal distribution problem with a two-tailed hypothesis test. This characteristics helps to determine the hypothesis, which is the first step in a hypothesis test.
So, the null hypothesis would be: .
The alternative hypothesis would be: .
In this problem, we don't use inequality relations because the teacher performed a two-tailed test, which only have to options, equal or not equal.
In second place, we have to determine the significance level, which is 5%, this means that the two tales rejecting zones must be equal to 5%, that is, 2.5% for each tale. This significance level is a percentage that refers to the probability of the null hypothesis to reach that zone, as you can see, it's a low probability, so if the null hypothesis reaches that zone, it means that the data has significance, it's reliable.
Now, we have to calculate the z-score, which is gonna tell us if the null hypothesis can reach the rejecting zone or not. The equation to find z-value is: ; where x is the sample mean, u is the population mean, o is the standard deviation and n is the sample.
Replacing all values:
.
Hence, the z-value is -5.26, which is located in the left side of the population mean. Now, we have to use the z-table to know if the null hypothesis is rejected or accepted.
So, according to the table the probability value (p-value), for a 5% of significance level, is 0.0001. But, this is a two-tailed test, so the p-value is actually 0.0001(2) = 0.0002.
Therefore, the p-value is way lower than the level of significance 0.05, we must reject the null hypothesis, which means that there's no enough evidence to accept it. So, according with the test, the students don't take 30 minutes on the quiz, the correct answer is A.
Answer:
A. is the correct answer
Step-by-step explanation:
Hope that this helps. Peace and Love
The solution to the expression 1 1/4 × 5 3/5 as a fraction is 4 1/2
from the question, we have the following parameters that can be used in our computation:
1 1/4 × 5 3/5
Convert the fractions to improper fraction
So, we have the following
1 1/4 × 5 3/5 = 5/4 × 18/5
Evaluate the product of the fractions
So, we have the following
1 1/4 × 5 3/5 = 1/4 × 18/1
Simplify
1 1/4 × 5 3/5 = 9/2
So, we have
1 1/4 × 5 3/5 = 4 1/2
Hence, the solution as a fraction is 4 1/2
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Answer:
7
1x4+1/4 x 5 3/5
4+1/4 x 5 3/5
5/4x5 3/5
5/4 x 25+3/5
5/4x38/5
1/4x28
28/4
7
The value of x in the expression 7x-3=5x+5 is 4
Given
7x-3=5x+5
Here,
The equation is linear in variable x .
7x-3=5x+5
7x - 5x - 3 = 5
2x-3=5
2x = 5 + 3
2x=8
x = 8/2
x=4
Thus the value of x is 4 .
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Answer:
x=4
Step-by-step explanation:
7x-3=5x+5
2x-3=5
2x=8
x=4
Answer:
The length of the altitude CD is 3.3 units .
Option (D) is correct .
Step-by-step explanation:
By using the pythagorean theorem
Hypotenuse² = Perpendicular² + Base²
Now in ΔCDA
Hypotenuse = CA = 6 unit
Base = AD = 5 units
Perpendicular = CD
Put all the values in the above
6² = CD² + 5²
As
6² = 36
5² = 25
CD² = 6² - 5²
= 36 - 25
CD² = 11
CD = 3.3 unit (Approx)
Therefore the length of the altitude CD is 3.3 units .
Option (D) is correct .
Determine the second derivative of y=cosxtanx. Thanks :)