timothy went to a baseball game. after the game, he wanted to ride the bus home. the red line and the blue line buses both both
2 answers:
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Answer:
II. This finding is significant for a two-tailed test at .01.
III. This finding is significant for a one-tailed test at .01.
d. II and III only
Step-by-step explanation:
1) Data given and notation
represent the battery life sample mean
represent the population standard deviation
sample size
represent the value that we want to test
represent the significance level for the hypothesis test.
t would represent the statistic (variable of interest)
represent the p value for the test (variable of interest)
2) State the null and alternative hypotheses.
We need to conduct a hypothesis in order to check if the mean battery life is equal to 18 or not for parta I and II:
Null hypothesis:
Alternative hypothesis:
And for part III we have a one tailed test with the following hypothesis:
Null hypothesis:
Alternative hypothesis:
Since we know the population deviation, is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:
(1)
z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".
3) Calculate the statistic
We can replace in formula (1) the info given like this:
4) P-value
First we need to calculate the degrees of freedom given by:
Since is a two tailed test for parts I and II, the p value would be:
And for part III since we have a one right tailed test the p value is:
5) Conclusion
I. This finding is significant for a two-tailed test at .05.
Since the . We reject the null hypothesis so we don't have a significant result. FALSE
II. This finding is significant for a two-tailed test at .01.
Since the . We FAIL to reject the null hypothesis so we have a significant result. TRUE.
III. This finding is significant for a one-tailed test at .01.
Since the . We FAIL to reject the null hypothesis so we have a significant result. TRUE.
So then the correct options is:
d. II and III only
Answer:
option (C) the same
Step-by-step explanation:
In the given question , it is mentioned that the ball of mass 0.2 kilograms is thrown with the velocity of 4 m/s in the horizontal direction
and, the 0.4 kilogram green ball is thrown in the horizontal direction with the velocity of 8 m/s
Here in both the cases no component of velocity in the vertical direction is provided.
Hence, it will be a case of free fall in the vertical direction.
Now,
from Newton's equation of motion, we have
here,
s is the distance
a is the acceleration
t is the time
in the above equation, mass has no role and the value of acceleration i.e acceleration due to gravity and distance of fall in the vertical direction is same.
Hence, the time taken for both the balls will be same.
Hence,
The correct answer is option (C) the same
Answer:
The value of x is,
Explanation:
Given:
Distributive Property states that when a number is multiplied by the sum of two numbers, the first number can be distributed to both of those numbers and multiplied by each of them separately.
If
Now, using distributive property on left hand side of the given expression as:
or
Addition Property of equality state that we add the same number from both sides of an equation.
Add r to both sides of an equation:
Simplify:
Subtraction Property of equality state that we subtract the same number from both sides of an equation.
Subtract Nx from both sides of an equation;
Simplify:
or
Division Property of equality states that we divide the same number from both sides of an equation.
Divide by (34-N) to both sides of an equation;
On Simplify: