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Maksim231197 [3]
3 years ago
5

Look at the screen shot and please help this is my homework please help

Mathematics
1 answer:
Musya8 [376]3 years ago
7 0

Answer:

the unit rate is $4

Step-by-step explanation:

If you divided 36 by nine you get 4

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Answer: i need the anwers to anwer

Step-by-step explanation:

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3 years ago
distance is equal to 1300km av average speed is equal to 20 metre per second time is equal to what ?​
AURORKA [14]
20 meter per second= 1200 m/h=1.5km/h
The time is 1300: 1.5 =866.66
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3 years ago
A patrolman spends 25% every day doing paperwork. The patrolmans shift each day is 8 hours. How much time does he spend doing pa
ExtremeBDS [4]
2 hours. If you convert 25% into a fraction form, it’s 1/4. Divide 8 by 4 and you get 2.
7 0
3 years ago
According to sleep researchers, if you are between the ages of 12 and 18 years old, you need 9 hours of sleep to be fully functi
Alexxx [7]

Answer:

d) H0:μ=9 and Ha:μ<9

t=\frac{7.9-9}{\frac{2.1}{\sqrt{28}}}=-2.77    

p_v =P(t_{(27)}  

If we compare the p value and the significance level assumed \alpha=0.05 we see that p_v so we can conclude that we have enough evidence to reject the null hypothesis, we can conclude that the true mean is significantly lower than 9 hours at 5% of signficance.  

Step-by-step explanation:

Data given and notation  

\bar X=7.9 represent the sample mean

s=2.1 represent the sample standard deviation

n=28 sample size  

\mu_o =9 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)  

State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the students at this high school are getting too little sleep, the system of hypothesis would be:  

Null hypothesis:\mu \geq 68  

Alternative hypothesis:\mu < 68  

If we analyze the size for the sample is < 30 and we don't know the population deviation so is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:  

t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}}  (1)  

t-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".  

The best option for this case would be:

d) H0:μ=9 and Ha:μ<9

Calculate the statistic

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

t=\frac{7.9-9}{\frac{2.1}{\sqrt{28}}}=-2.77    

P-value

The first step is calculate the degrees of freedom, on this case:  

df=n-1=28-1=27  

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

p_v =P(t_{(27)}  

Conclusion  

If we compare the p value and the significance level assumed \alpha=0.05 we see that p_v so we can conclude that we have enough evidence to reject the null hypothesis, we can conclude that the true mean is significantly lower than 9 hours at 5% of signficance.  

8 0
3 years ago
What is the interquartile range for the data set? <br> 4 , 7, 7, 3, 5, 2, 6, 7, 9
valina [46]
Population size:9
Lower quartile (xL): 3.5
Upper quartile (xU): 7

<span>Interquartile range (xU-xL): 3.5</span>
4 0
3 years ago
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