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Wewaii [24]
3 years ago
10

Rename 1/3 and 5/18 using the least common denominator.

Mathematics
1 answer:
abruzzese [7]3 years ago
6 0
LCD is 18

1/3 = 6/18...and then u already have 5/18 using the LCD...so answer is A

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A personnel manager is concerned about absenteeism. She decides to sample employee records to determine if absenteeism is distri
nlexa [21]

Answer:

df=categor-1=6-1=5

The critical value can be founded with the following Excel formula:

=CHISQ.INV(1-0.05,5)

And we got \chi^2_{critc}= 11.0705

a. 11.070

And since our calculated value is lower than the critical we FAIL to reject the null hypothesis at 5% of significance

Step-by-step explanation:

Previous concepts

A chi-square goodness of fit test "determines if a sample data matches a population".

A chi-square test for independence "compares two variables in a contingency table to see if they are related. In a more general sense, it tests to see whether distributions of categorical variables differ from each another".

Solution to the problem

For this case we want to test:

H0: Absenteeism is distributed evenly throughout the week

H1: Absenteeism is NOT distributed evenly throughout the week

We have the following data:

Monday  Tuesday  Wednesday Thursday Friday Saturday    Total

 12             9                 11                 10           9            9              60

The level of significance assumed for this case is \alpha=0.05

The statistic to check the hypothesis is given by:

\sum_{i=1}^n \frac{(O_i -E_i)^2}{E_i}

The table given represent the observed values, we just need to calculate the expected values with the following formula E_i = \frac{60}{6}= 10 and the expected value is the same for all the days since that's what we want to test.

now we can calculate the statistic:

\chi^2 = \frac{(12-10)^2}{10}+\frac{(9-10)^2}{10}+\frac{(11-10)^2}{10}+\frac{(10-10)^2}{10}+\frac{(9-10)^2}{10}+\frac{(9-10)^2}{10}=0.8

Now we can calculate the degrees of freedom (We know that we have 6 categories since we have information for 6 different days) for the statistic given by:

df=categor-1=6-1=5

The critical value can be founded with the following Excel formula:

=CHISQ.INV(1-0.05,5)

And we got \chi^2_{critc}= 11.0705

a. 11.070

And since our calculated value is lower than the critical we FAIL to reject the null hypothesis at 5% of significance

4 0
3 years ago
6x^8 + 4x^5 + (n + 1)x^2-n / 10x - 10<br> quien me ayuda
Neporo4naja [7]

Answer:

parte 1) | Superprof

1 Indica cuáles de las siguientes expresiones son monomios. En caso de ... 4 Encuentra el valor numérico del polinomio P(x) = x^3 + 3x^2 - 4x - 12 ... d) (10x – 5/4x³ + 5/2x² – 1/2) : (5x)

7 0
3 years ago
Help needed!! Don’t know how to do!!
Aleks [24]

Answer:

D,0,2,-2

Step-by-step explanation:

2x^5-3x^3-20x=0

x(2x^4-3x^2-20)=0

x=0

or 2x^4-3x^2-20=0

put x²=t

2t²-3t-20=0

-20×2=-40

8-5=3

8×-5=-40

2t²-(8-5)t-20=0

2t²-8t+5t-20=0

2t(t-4)+5(t-4)=0

(t-4)(2t+5)=0

t=4

x²=4

x=2,-2

t=-5/2

x²=-5/2

it gives imaginary  root. so real rational roots are 0,2,-2

3 0
3 years ago
Read 2 more answers
Work out m and c for the line:3x+2y-1=0
zhuklara [117]

Answer:

3x + 2y - 1 = 0 \\ 2y =  - 3x + 1 \\ y =  -  \frac{3}{2} x +  \frac{1}{2}  \\ from \: general \: equation \:  \: y = mx + c \\ by \: comparison \\ m =  -  \frac{3}{2}  \\ c =  \frac{1}{2}

8 0
3 years ago
Find the value of x for which abcd must be a parallelogram
aleksandr82 [10.1K]

Answer:

x = 7

Step-by-step explanation:

3x - 17 = 25 - 3x

Get the x's on one side and the integers on the other

3x + 3x = 25 + 17

6x = 42

x = 7

5 0
3 years ago
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