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Otrada [13]
3 years ago
5

A sample is best defined as ________________. the first 20% of the population the last 20% of the population a smaller group sel

ected from a given population a smaller group selected from the general populou
Mathematics
1 answer:
morpeh [17]3 years ago
5 0
A sample is best defined as 'a smaller group selected from a given population'.
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It is advertised that the average braking distance for a small car traveling at 65 miles per hour equals 120 feet. A transportat
Mrrafil [7]

Answer:

State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the mean is equal to 120 or not, the system of hypothesis would be:  

Null hypothesis:\mu = 120  

Alternative hypothesis:\mu \neq 120  

Part 2

Calculate the statistic

We can replace in formula (1) the info given like this:  

z=\frac{114-120}{\frac{22}{\sqrt{36}}}=-1.636    

P-value

Since is a two sided test the p value would be:  

p_v =2*P(z  

Step-by-step explanation:

Data given and notation  

\bar X=114 represent the sample mean  

\sigma=22 represent the population standard deviation

n=36 sample size  

\mu_o =120 represent the value that we want to test

\alpha represent the significance level for the hypothesis test.  

t would represent the statistic (variable of interest)  

p_v represent the p value for the test (variable of interest)  

Part 1

State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the mean is equal to 120 or not, the system of hypothesis would be:  

Null hypothesis:\mu = 120  

Alternative hypothesis:\mu \neq 120  

If we analyze the size for the sample is > 30 and we  know the population deviation so is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:  

z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}}  (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".  

Part 2

Calculate the statistic

We can replace in formula (1) the info given like this:  

z=\frac{114-120}{\frac{22}{\sqrt{36}}}=-1.636    

P-value

Since is a two sided test the p value would be:  

p_v =2*P(z  

8 0
3 years ago
Find the missing number. 30,______ 19, 13 1/2.
Andru [333]
The answer is 24.5 because 19-13 \frac{1}{2} = 5 \frac{1}{2} so you add 5.5 from 19 to get the answer
5 0
3 years ago
I need Help Please, I will give brainliest!
spin [16.1K]

Answer: You do I-ready welp I can help you

Step-by-step explanation:

I think it is 1 whole

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2 years ago
What are the solutions to the quadratic equation (5y + 6)2 = 24?
lana [24]
To solve for y, apply the distributive property:
10y + 12 = 24
Then, subtract 12 from both sides and you will get:
10y = 12 \\
Then solve for y, by dividing both sides by 10.

Your final answer will be y=1.2
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3 years ago
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A project is graded on a scale of 1 to 5. If the random variable, X, is the project grade, what is the mean of the probability
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the mean is 3

answer choice D

Step-by-step explanation:

60/20

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