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sleet_krkn [62]
3 years ago
12

Simplify the expression:-5-(-26)​

Mathematics
2 answers:
Gelneren [198K]3 years ago
8 0
The simplified answer is 31
cluponka [151]3 years ago
4 0

Answer:

21

Step-by-step explanation:

-(-26) would be positive 26 because one negative multiplied by another negative equals a positive. We are left with -5+26 which would equal 21.

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The mayor of a town has proposed a plan for the annexation of a new bridge. A political study took a sample of 1000 voters in th
garri49 [273]

Answer:

z=\frac{0.42 -0.39}{\sqrt{\frac{0.39(1-0.39)}{1000}}}=1.945  

p_v =P(Z>1.945)=0.0259  

If we compare the p value obtained with the significance level given \alpha=0.02 we have p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, and we can said that at 2% of significance the proportion of residents who favored annexation is not significantly higher than 0.39.  

Step-by-step explanation:

1) Data given and notation  

n=1000 represent the random sample taken

\hat p=0.42 estimated proportion of residents who favored annexation

p_o=0.39 is the value that we want to test

\alpha=0.02 represent the significance level

Confidence=98% or 0.98

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 higher than 0.39:  

Null hypothesis:p\leq 0.39  

Alternative hypothesis:p > 0.39  

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{0.42 -0.39}{\sqrt{\frac{0.39(1-0.39)}{1000}}}=1.945  

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=0.02. The next step would be calculate the p value for this test.  

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

p_v =P(Z>1.945)=0.0259  

If we compare the p value obtained with the significance level given \alpha=0.02 we have p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, and we can said that at 2% of significance the proportion of residents who favored annexation is not significantly higher than 0.39.  

4 0
3 years ago
Please help quickly!
bekas [8.4K]

Answer:

the answer is 2.8

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
(d) 12b + 5.65 = 12.13
-BARSIC- [3]

Answer:

D. 804.2

Step-by-step explanation:

The area equation is πr^2 so

16^2 = 256

256 × π (or 3.14) = 803.84

which is ≈ 804.2

Please mark brainliest. :)

UWU have a nice day!

3 0
3 years ago
Need help with this
velikii [3]

Answer:

search it up

Step-by-step explanation:

5 0
3 years ago
The dot plot shows the number of songs in a play list. Determine the range of the data set. A) 11 B) 22 C) 25 D) 50
Vinvika [58]

Answer:

47-25=22

Step-by-step explanation:

range is highest number subtract the lowest number lol easiest of all for the dot plot it is last number and first number with dots

3 0
3 years ago
Read 2 more answers
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