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nignag [31]
2 years ago
10

Four subtracted from two times a number is 48. What is the number?

Mathematics
1 answer:
Rina8888 [55]2 years ago
5 0

Answer:

26

Step-by-step explanation:

n*2 - 4 = 48

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A researcher claims that the variation in the salaries of elementary school teachers is greater than the variation in the salari
guajiro [1.7K]

Answer:

a

The null hypothesis is  H_o :  \sigma^2_1 = \sigma^2 _2

The alternative hypothesis is H_a :  \sigma_1 ^2 > \sigma^2_2

b

F_{critical} = 1.8608

c

F = 2.9085

d

    The decision rule is  

Reject the null hypothesis

e

There is sufficient evidence to support the researchers claim

Step-by-step explanation:

From the question we are told that

 The first sample size is  n_1 = 30

 The sample variance for elementary school is  s^2_1 = 8324

 The second sample size is  n_2 = 30

  The sample variance for the secondary school is  s^2_2 = 2862

   The significance level is  \alpha = 0.05

The null hypothesis is  H_o :  \sigma^2_1 = \sigma^2 _2

The alternative hypothesis is H_a :  \sigma_1 ^2 > \sigma^2_2

Generally from the F statistics table  the critical value of \alpha = 0.05 at first and  second degree of freedom df_1 = n_1 - 1 = 30 - 1 = 29 and  df_2 = n_2 - 1 = 30 - 1 = 29 is  

         F_{critical} = 1.8608

Generally the test statistics is mathematically represented as

       F = \frac{s_1^2 }{s_2^2}

=>   F = \frac{8324 }{2862}

=>   F = 2.9085

Generally from the value obtained we see that  F >  F_{critical } Hence

   The decision rule is  

Reject the null hypothesis

    The conclusion is  

  There is sufficient evidence to support the researchers claim

   

4 0
3 years ago
Please someone help please
Helga [31]

Answer:

Step-by-step explanation:

d=m+a/n

Firstly, we multiply n to get rid of it by both sides. Since n is dividing a.

d=m+a/n

*n     *n

dn=m+a

-m  -m

a=dn-m

8 0
3 years ago
Read 2 more answers
Li rolls a number cube labeled 1 to 6 a total of 24 times. How many times can she expect to roll a 1
scoundrel [369]

Li can expect to roll a one 4 times.

Since there are six possibilities (1, 2, 3, 4, 5 & 6), you divide 24 and 6 to get 4.

8 0
3 years ago
Read 2 more answers
What percentage is 11 of 88
Vera_Pavlovna [14]

Answer:

The answer is: 12.5%

Step-by-step explanation:

Divide 11 by 88. Multiply the result by 100 to get percent.

11/88 = 0.125

0.125 x 100 = 12.5%

Hope this Helps!! Have an Awesome Day!! (-:

6 0
3 years ago
0.4 to the 6th power
kaheart [24]
.4^6 = .004096 Hoped this helps.
6 0
3 years ago
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