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3 years ago

Isabel tried to evaluate an expression step by step.

Mathematics

2 answers:

lianna [129]3 years ago

8 0

Answer:

Step 3

Step-by-step explanation:

(2+8)+8
2+(8+8)
2+0 mistake, 8 + 8 ≠ 0, should be 16 instead of zero
2

goldenfox [79]3 years ago

7 0

Answer:

Step three

Step-by-step explanation:

(2+8)+8

2+(8+8)

2+0

In the third step Isabel subtracted 8 into 8 not added, in order to evaluate the expression correctly she needed to add 8 into 8 and then add the two.

$(2+8)+8$

$2+(8+8)$

$8+8=16$

$2+16=18$

$=18$

Hope this helps.

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Answer:

The calculated t- value = 1.09 > 3.19 at 0.025 level of significance

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Step-by-step explanation:

Step(i):-

Given the mean of the Population(μ) = 419 grams

The sample size 'n' =19

Given mean of the sample x⁻ = 412

Given variance of the sample S² = 784

S = √784 = 28

Step(ii):-

Null hypothesis: H₀: There is no sufficient evidence to support the claim that the bags are underfilled.

Alternative hypothesis: H₁:

There is sufficient evidence to support the claim that the bags are underfilled.

Test statistic

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t = -1.09

|t| = |-1.09|

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Answer:

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Step-by-step explanation:

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