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GREYUIT [131]
3 years ago
15

Which number is smaller, 2.8 or 2.75

Mathematics
2 answers:
Sedbober [7]3 years ago
8 0
2.75 is the smaller number
Gnom [1K]3 years ago
7 0
Answer: 2.75

2.8 is basically 2.80 and that is 0.05 more, therefore 2.65 is the smaller number
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How do you tell whether the ratios form a proportion
valkas [14]
Set them up like this example:

4             8
_     =      _

6            12

cross multiply by multiplying 4 by 12 and 6 by 8.
If they are equal then it is proportional.
3 0
3 years ago
I need help with this
elena-s [515]

Answer:

C

Step-by-step explanation:

Like terms mean same variable. it doesnt really matter if its negative in the front.

8 0
3 years ago
2. The following table shows the probability of females and males preferring to drive an SUV or a sports car,
DerKrebs [107]

Answer:

Hope this helps

Step-by-step explanation:

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4 0
3 years ago
A well-known brokerage firm executive claimed that 50% of investors are currently confident of meeting their investment goals. A
VMariaS [17]

Answer:

p_v =P(Z  

If we compare the p value obtained and using the significance level given \alpha=0.005 we have p_v so we can conclude that we have enough evidence to reject the null hypothesis, and we can said that at 5% of significance the proportion of adults that said they are confident of meeting their goals  is significantly lower than 0.5 or 50% .  

Step-by-step explanation:

1) Data given and notation

n=200 represent the random sample taken

X represent the people that said they are confident of meeting their goals

\hat p=0.44 estimated proportion of adults that said they are confident of meeting their goals

p_o=0.5 is the value that we want to test

\alpha=0.005 represent the significance level

Confidence=99.5% or 0.995

z would represent the statistic (variable of interest)

p_v represent the p value (variable of interest)  

2) Concepts and formulas to use  

We need to conduct a hypothesis in order to test the claim that the proportion is less than 0.5.:  

Null hypothesis:p\geq 0.5  

Alternative hypothesis:p < 0.5  

When we conduct a proportion test we need to use the z statistic, and the is given by:  

z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}} (1)  

The One-Sample Proportion Test is used to assess whether a population proportion \hat p is significantly different from a hypothesized value p_o.

3) Calculate the statistic  

Since we have all the info requires we can replace in formula (1) like this:  

z=\frac{0.44 -0.5}{\sqrt{\frac{0.5(1-0.5)}{200}}}=-1.697  

4) Statistical decision  

It's important to refresh the p value method or p value approach . "This method is about determining "likely" or "unlikely" by determining the probability assuming the null hypothesis were true of observing a more extreme test statistic in the direction of the alternative hypothesis than the one observed". Or in other words is just a method to have an statistical decision to fail to reject or reject the null hypothesis.  

The significance level provided \alpha=0.005. The next step would be calculate the p value for this test.  

Since is left tailed test the p value would be:  

p_v =P(Z  

If we compare the p value obtained and using the significance level given \alpha=0.005 we have p_v so we can conclude that we have enough evidence to reject the null hypothesis, and we can said that at 5% of significance the proportion of adults that said they are confident of meeting their goals  is significantly lower than 0.5 or 50% .  

4 0
3 years ago
What is 3×(-45+6) 23²+1⁴
gtnhenbr [62]

Answer:

3×(-45+6) 23²+1⁴

= - 61892

Step-by-step explanation:

4 0
2 years ago
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