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erastovalidia [21]
4 years ago
14

Suppose the population of ages of all seven members of a tutoring service are: 22,17,19,21,20,19,24 A random sample of 3 members

was taken and the ages were: 17,19,21. Determine the sampling error to 2 decimal places if this sample was used to estimate the population mean age.
Mathematics
1 answer:
love history [14]4 years ago
7 0

Answer:

6.36%

Step-by-step explanation:

What we should do is calculate the mean value when we have all the data and then calculate the mean with the random samples, and calculate the error.

First, average of all data:

(22 + 17 + 19 + 21 + 20 + 19 + 24) / 7 = 20.29

Average for the random sample:

(17 + 19 + 21) / 3 = 19

% error = | sample - all / all | * 100

replacing the values:

% error = | (19 - 20.29) /20.29 | * 100

% error = 6.36%

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Brums [2.3K]

Answer:

9y+2y-5y=6y

Step-by-step explanation:

So we have the expression:

9y+2y-5y

To simplify, simply combine the like terms. Therefore:

9y+2y-5y\\=11y-5y\\=6y

Further notes:

To understand why we can combine like terms in the first place, we just need to use the distributive property. So we have the expression:

9y+2y-5y

Now, factor out a y from the three terms:

=y(9+2-5)

Do all the operations inside the parenthesis:

y(9+2-5)\\=y(11-5)\\=y(6)=6y

And we moved the y back to the front!

This is the same result as before. When combining like terms, this is what we're essentially doing but without doing the distributive property manually. I hope you understand a bit better on how and why we can combine like terms!

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3 years ago
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Answer:

534.07in squared is what I got for the surface area

Step-by-step explanation:

7 0
3 years ago
Someone please help I really appreciate it
Alex_Xolod [135]
So you have to find the relationship between the pumpkin diameter (y) and the number of weeks passed (x) in a table, lets do it taking into account that the equation modeling such behaviour is:
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x                                y                            
week                         diameter
0                                6
1                                8
3                                12
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5 0
3 years ago
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Which equation will be parallel to y=6 A)Y= -6x B)X=6 C)y=1 D)Y=6x
galben [10]

Answer:

A

Step-by-step explanation:

4 0
4 years ago
The data below shows the points scored and minutes played by six basketball players during the 2004-2005 season. The least squar
k0ka [10]

We assume data and prediction as question is incomplete

Answer and Step-by-step explanation:

Least squares regression line equations are used to model the relationship that exists between two variables, dependent and independent variables. The equation has the form y=a+bx where y is the dependent variable and x is independent variable, a is a constant and is the y intercept and b is the slope of the line. This relationship is then used to predict future outcomes.

Given that data for 2004-2005 for the basketball players are :

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John- 30 points

Chris- 50 points

Dave-15 points

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Richard -40 points

We predict the scores/points for James (for example) for the following year using the equation of the regression line y=0.79x+1544

We substitute his points x=20 I'm the equation:

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The predicted value is 1599.8

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