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svp [43]
3 years ago
5

In a class of 25 students , 12 have taken in mathematics , 8 have taken mathematics but not biology . Find

Mathematics
2 answers:
lina2011 [118]3 years ago
8 0

Answer:

I.4

ii.13

Step-by-step explanation:

....ur welcome........

Tom [10]3 years ago
5 0

Answer:

I.4

ii.13

Step-by-step explanation:

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How do you solve 3n+4n=-14​
gizmo_the_mogwai [7]

Step-by-step explanation:

3n+4n=-14

now add 3n and 4n

7n = -14

divide both by 7

n = -2

3 0
3 years ago
Help me please I don’t know this
Afina-wow [57]
The answer is the number will have to be less than 11 which means that it is a. 9
sorry if it is incorrect.
8 0
3 years ago
Suppose the standard deviation of a normal population is known to be 3, and H0 asserts that the mean is equal to 12. A random sa
blagie [28]

Answer:

z=\frac{12.95-12}{\frac{3}{\sqrt{36}}}=1.9  

p_v =P(z>1.9)=0.0287  

If we compare the p value and the significance level given \alpha=0.05 we see that p_v so we can conclude that we have enough evidence to reject the null hypothesis, so we can conclude that the true mean is higher than 12 at 5% of signficance.  

Step-by-step explanation:

Data given and notation  

\bar X=12.95 represent the sample mean

\sigma=3 represent the population standard deviation for the sample  

n=36 sample size  

\mu_o =12 represent the value that we want to test  

\alpha=0.05 represent the significance level for the hypothesis test.  

z 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 mean is equal to 12, the system of hypothesis would be:  

Null hypothesis:\mu \leq 12  

Alternative hypothesis:\mu > 12  

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:  

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".  

Calculate the statistic  

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

z=\frac{12.95-12}{\frac{3}{\sqrt{36}}}=1.9  

P-value  

Since is a right tailed test the p value would be:  

p_v =P(z>1.9)=0.0287  

Conclusion  

If we compare the p value and the significance level given \alpha=0.05 we see that p_v so we can conclude that we have enough evidence to reject the null hypothesis, so we can conclude that the true mean is higher than 12 at 5% of signficance.  

4 0
3 years ago
Read 2 more answers
What is 20% of 148<br> Anyone know
Alexeev081 [22]

Answer:

29.6

Step-by-step explanation:

20% = 0.20

0.20 * 148 = 29.6

6 0
3 years ago
Help me pls thank you sooooo much
Lubov Fominskaja [6]

Answer: Length: 24

Step-by-step explanation:

4 0
2 years ago
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