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VLD [36.1K]
2 years ago
5

HELPPPPP!!!!!!!! (explanation needed too)

Mathematics
1 answer:
Sunny_sXe [5.5K]2 years ago
6 0
<h3>A) 2,000,000 + 300,000 + 50,000</h3><h3>B) 25 x 10^6</h3>

25,000,000

20,000,000 + 5,000,000

<h3>C) Which of these numbers is a square number?</h3>

A) 4 x 10^5

400,000

A is not the answer.

B) 9 x 10^4

90,000

B is not the answer.

C) 4 x 10^3

4,000

C is the answer.

D) 9 x 10^3

9,000

D is not the answer.

<h3>The answer for C) Which of these numbers is a square number? is C) 4 x 10^3.</h3>
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A researcher wishes to examine the relationship between years of schooling completed and the number of pregnancies in young wome
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Answer:

1. When amount of schooling increases by one year, the number of pregnancies will decrease by 4.

Step-by-step explanation:

Regression analysis is a statistical technique which is used for forecasting. It determines the relationship between two variables. It determines the relationship of two or more dependent and independent variables. It is widely used in stats to find trend in the data. It helps to predict the values of dependent and independent variables. In the given question, there is regression equation given. X and Y are considered as dependent variables. When number of schooling increases by 1 year then number of pregnancies will decrease by 4

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Alex has a bag of marbles. 3 are blue, 5 are red, 12 are green, and 8 are purple. What is the probability of drawing 3 purple ma
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Here are summary statistics for randomly selected weights of newborn​ girls: nequals=174174​, x overbarxequals=30.930.9 ​hg, seq
MaRussiya [10]

Answer:

The 95% confidence interval would be given by (29.780;32.020)  

Step-by-step explanation:

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

\bar X=30.9 represent the sample mean for the sample  

\mu population mean (variable of interest)

s=7.5 represent the sample standard deviation

n=174 represent the sample size  

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

In order to calculate the critical value t_{\alpha/2} we need to find first the degrees of freedom, given by:

df=n-1=174-1=173

Since the Confidence is 0.95 or 95%, the value of \alpha=0.05 and \alpha/2 =0.025, and we can use excel, a calculator or a tabel to find the critical value. The excel command would be: "=-T.INV(0.025,173)".And we see that t_{\alpha/2}=1.97, this value is similar to the obtained with the normal standard distribution since the sample size is large to approximate the t distribution with the normal distribution.  

Now we have everything in order to replace into formula (1):

30.9-1.97\frac{7.5}{\sqrt{174}}=29.780    

30.9+1.97\frac{7.5}{\sqrt{174}}=32.020

So on this case the 95% confidence interval would be given by (29.780;32.020)    

The value 29.6 is not contained on the interval calculated.

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3 years ago
Kelly spends $75.98 on items for a party. She buys thank you cards that cost $3.18 (including tax). She also buys gift bags that
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B. 7 because if you do $75.98/$10.40=7
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3 years ago
Segment ET is a median of triangle FGE. Find the length of segment GT if GF=12.
yarga [219]

Answer: The length of segment GT is 6

Step-by-step explanation: Have a nice day!✌️

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2 years ago
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