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kiruha [24]
2 years ago
10

Given that x = 6 and y = -4, evaluate the following expression.

Mathematics
1 answer:
mr_godi [17]2 years ago
8 0
Answer: -6.5a
Hopes this helps
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A sample of 11 students using a Ti-89 calculator averaged 31.5 items identified, with a standard deviation of 8.35. A sample of
lina2011 [118]

Answer:

We reject H₀, with CI = 90 % we can conclude that the mean numbers of times identified with Ti-84 does not exceed that of the Ti-89 by more than 1,80

Step-by-step explanation:

Ti-89 Calculator

Sample mean     x = 31,5

Sample standard deviation   s₂  = 8,35

Sample size        n₂ = 11

Ti-84 Calculator

Sample mean     y = 46,2

Sample standard deviation   s₁  = 9,99

Sample size        n₁ = 12

t(s)  = ( y - x - d ) / √s₁²/n₁ + s₂²/n₂

t(s)  = 12,9 / √(99,8/12) + (69,72/11)

t(s)  = 12,9 / √8,32 + 6,34

t(s)  = 12,9 / 3,83

t(s) = 3,37

Test Hypothesis

Null Hypothesis               H₀      y - x > 1,80

Altenative Hypothesis       Hₐ      y - x ≤ 1,80

We have a t(s) = 3,37

We need to compare with t(c)   critical value for

t(c) α; n₁ +n₂-2            df = 12 +11 -2     df  = 21

If we choose  CI = 95 %    then  α = 5 %   α = 0,05

From t-student table

t(c) = 1,72

t(s) = 3,37

t(s) >t(c)

t(s) is in the rejection region therefore we accept Hₐ with CI = 95 %

8 0
3 years ago
What is the sum of 2 numbers is 30 and their difference is 6 answer?
gayaneshka [121]
The numbers are 18 and 12
7 0
3 years ago
What is the area of this figure? <br><br> Enter your answer in the box
Anvisha [2.4K]
Area of box : 18*18, which is 324

area of larger triangle : 18*16/2 which is 144

area of larger triangle : 8*16/2 which is 64

add them all to get 532
7 0
3 years ago
Which of these is the algebraic expression for "seven less than some number?" Fraction 7 over h Fraction h over 7 h − 7 7 − h
Olin [163]

Let's assume the some number be h.

Now the given statement is "seven less than some number".

Which means we need to take out 7 from h. Hence, it can be translate into an algebraic expression as h-7.

6 0
3 years ago
Read 2 more answers
A computer program in Shannon’s computer carries out a single mathematical operation in 1.5 × 10-6 seconds. How much time would
kykrilka [37]

1/1.5 * 10^-6 = 2500/x

x = 1.5 * 10^-6 * 2500

x = 0.00375 or 3.75 * 10^-3 second.

3 0
3 years ago
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