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Olin [163]
2 years ago
14

Evaluate the following. Express your answer in simplest form. -5/8 - (-2 5/6)

Mathematics
1 answer:
Anuta_ua [19.1K]2 years ago
5 0

Answer:

the answer to your equation is 2

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The mean SAT score in mathematics, M, is 600. The standard deviation of these scores is 48. A special preparation course claims
kupik [55]

Answer:

Step-by-step explanation:

The mean SAT score is \mu=600, we are going to call it \mu since it's the "true" mean

The standard deviation (we are going to call it \sigma) is

\sigma=48

Next they draw a random sample of n=70 students, and they got a mean score (denoted by \bar x) of \bar x=613

The test then boils down to the question if the score of 613 obtained by the students in the sample is statistically bigger that the "true" mean of 600.

- So the Null Hypothesis H_0:\bar x \geq \mu

- The alternative would be then the opposite H_0:\bar x < \mu

The test statistic for this type of test takes the form

t=\frac{| \mu -\bar x |} {\sigma/\sqrt{n}}

and this test statistic follows a normal distribution. This last part is quite important because it will tell us where to look for the critical value. The problem ask for a 0.05 significance level. Looking at the normal distribution table, the critical value that leaves .05% in the upper tail is 1.645.

With this we can then replace the values in the test statistic and compare it to the critical value of 1.645.

t=\frac{| \mu -\bar x |} {\sigma/\sqrt{n}}\\\\= \frac{| 600-613 |}{48/\sqrt(70}}\\\\= \frac{| 13 |}{48/8.367}\\\\= \frac{| 13 |}{5.737}\\\\=2.266\\

<h3>since 2.266>1.645 we  can reject the null hypothesis.</h3>
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3 years ago
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Multiply. assume that no denominator equals zero x^2-16
lawyer [7]
There's nothing to multiply. However, you can factor it to get (x + 4)(x - 4). 
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Krutika was thinking of a number. Krutika adds 4 to it, then doubles it and gets an answer of 83.9. What was the original number
mr Goodwill [35]

Answer:37.95

Step-by-step explanation:

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Por qué la Biblia es un libro sagrado
Eddi Din [679]
Porque se dice que es la palabra de Dios y Él es Santo.
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when the smallerof two consecutive integers is added to two times the larger,the result is 17.find the integers
Gnesinka [82]
Formula:

x + 2(x+1) = 17
x + 2x + 2 = 17
3x + 2 = 17
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x = 5

So, the answer is 5 and 6

Hope this helped!
7 0
3 years ago
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