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3 years ago

Math

Mathematics

1 answer:

djverab [1.8K]3 years ago

3 0

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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 %

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3 years ago

The "P" in 20Pg represents a:

marusya05 [52]

Answer:

The ”P”in 20Pg represents

A.Permutation

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3 years ago

Scrieți multipli lui 7 mai mari decât 10 și mai mici decât 20

beks73 [17]

<h2>Helloooo!!! Marie Here!!!</h2><h2 />

The answer is here:

7 . 2 = 14, 10 >14 > 50

7 . 3 = 21, 10 > 21 > 50

7 . 4 = 28, 10 > 28 > 50

7 . 5 = 35, 10 > 35 > 50

7 . 6 = 42, 10 > 42 > 50

<h3>Hope This Helps! Have A GREAT Day!</h3>

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3 years ago

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7nadin3 [17]

No, she will not have enough. If you estimate the amount of money it will cost for the turkey sandwich and the large drink, it will cost about $7. She will only have $6.25 after admission costs.

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3 years ago

I don’t Understand this who can help me

harina [27]

Step-by-step explanation:

The area of a square is

${s}^{2}$

where s is the side length.

It is given that the smaller square side length is s so that means the area of that smaller square is the formula above.

The longer square is twice the side length of the side length of the smaller square.

Since all squares have equal sides, that means all the side are twice than the smaller square sides.

We can represent that larger square area by

(4s) squared

To find how many smaller squares it would take to fill the larger square divide the formula by each other.

(4s)÷s squared =4

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