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mojhsa [17]
3 years ago
13

Brandi is half as old as candi. Randy is 10 years older than brandi.if candi is 22, how old is randy

Mathematics
1 answer:
seraphim [82]3 years ago
6 0
22 divided by 2 = 11
11+10=21
The answer is 21
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Suppose a mutual fund qualifies as having moderate risk if the standard deviation of its monthly rate of return is less than 5​%
Leokris [45]

Answer:

\chi^2 =\frac{28-1}{25} 21.7156 =23.453

p_v =P(\chi^2

In order to find the p value we can use the following code in excel:

"=CHISQ.DIST(23.453,27,TRUE)"

Conclusion

If we compare the p value and the significance level provided we see that p_v >\alpha so on this case we have enough evidence in order to FAIL reject the null hypothesis at the significance level provided. And that means that the population variance is not significantly lower than 5% so we can't conclude that we have a moderate risk for this case.

Notation and previous concepts

A chi-square test is "used to test if the variance of a population is equal to a specified value. This test can be either a two-sided test or a one-sided test. The two-sided version tests against the alternative that the true variance is either less than or greater than the specified value"

n=28 represent the sample size

\alpha=0.1 represent the confidence level  

s^2 =21.7156 represent the sample variance obtained

\sigma^2_0 =25 represent the value that we want to test

Null and alternative hypothesis

On this case we want to check if the population variance specification is lower than 25, so the system of hypothesis would be:

Null Hypothesis: \sigma^2 \geq 25

Alternative hypothesis: \sigma^2

Calculate the statistic  

For this test we can use the following statistic:

\chi^2 =\frac{n-1}{\sigma^2_0} s^2

And this statistic is distributed chi square with n-1 degrees of freedom. We have eveything to replace.

\chi^2 =\frac{28-1}{25} 21.7156 =23.453

Calculate the p value

In order to calculate the p value we need to have in count the degrees of freedom , on this case 27. And since is a right tailed test the p value would be given by:

p_v =P(\chi^2

In order to find the p value we can use the following code in excel:

"=CHISQ.DIST(23.453,27,TRUE)"

Conclusion

If we compare the p value and the significance level provided we see that p_v >\alpha so on this case we have enough evidence in order to FAIL reject the null hypothesis at the significance level provided. And that means that the population variance is not significantly lower than 5% so we can't conclude that we have a moderate risk for this case.

4 0
3 years ago
Mae ling earns a weekly salary of $320 plus a 8.0% commission on sales at a gift shop. How much would she make in a work week if
Alex787 [66]

Step-by-step explanation:

4300$ - 100%

x$ - 8%

(4300 × 8) ÷ 100 = 344$

344 + 320 = 664$

answer: 664$ :))))

8 0
3 years ago
Can someone help me please and thankyou
Phantasy [73]
X° = 90°-29°
= 61°

y°= 90°- 61°
= 29°

find y and x right?
8 0
2 years ago
A farmer has 1,275 seeds. He plants them all in 15 equal rows. A crow comes and eats 5 seeds from each now. How many seeds are l
Eduardwww [97]

Answer:

17 seeds remain

The equation: \frac{1275}{15} / 5

\frac{1275}{15} = 85

85 / 5 = 17

3 0
2 years ago
I still don't get it.
AlexFokin [52]
Ok? If there a question?
7 0
2 years ago
Read 2 more answers
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