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svet-max [94.6K]
3 years ago
12

Nine students Ryan’s class are wearing gray there are 30 students in his class Ryan says that 30% of his class is wearing gray i

s he correct explain your reasoning
Mathematics
2 answers:
matrenka [14]3 years ago
7 0

Answer:

Step-by-step explanation:

No u

aleksklad [387]3 years ago
3 0

Answer:

ur mom

Step-by-step explanation:

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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 the fair share?
andriy [413]
1 whole should be the answer


8 0
3 years ago
Read 2 more answers
A=9, b = 10, c =11.4, 2C = ___
natima [27]

Answer:

22.8

Step-by-step explanation:

A, and B are distractions. multippe C (11.4) by 2, you'll get 2C (22.8)

6 0
3 years ago
Read 2 more answers
How do you change 0.16666 in a fraction
Natasha_Volkova [10]
Here's how to convert 0.16666 to a fraction...

There is not much that can be done to figure out how to write 0.16666 as a fraction, except to literally use what the decimal portion of your number, the .16666, means.

Since there are 5 digits in 16666, the very last digit is the "100000th" decimal place.

So we can just say that .16666 is the same as 16666/100000.

The fraction 16666/100000 is not reduced to lowest terms. We can reduce this fraction to lowest
terms by dividing both the numerator and denominator by 2.

Why divide by 2? 2 is the Greatest Common Divisor (GCD)
or Greatest Common Factor (GCF) of the numbers 16666 and 100000.
So, this fraction reduced to lowest terms is 8333/50000

So your final answer is: 0.16666 can be written as the fraction 8333/50000

3 0
3 years ago
Read 2 more answers
Three expressions equivalent to the following: -90x + 60
Deffense [45]

Answer:

33beacuse you i have -90×+60=9×6=369-63

3 0
3 years ago
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