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Mice21 [21]
3 years ago
5

There is concern that increased industrialization may be increasing the mineral content of river water. Ten years ago, the silic

on content of the water in a certain river was 5 mg/L. Eighty-five water samples taken recently from the river have mean silicon content 5.4 mg/L and standard deviation 1.2 mg/L. a. Find the P-value. b. Do you believe it is plausible that the silicon content of the water is no greater than it was 10 years ago
Mathematics
1 answer:
Tema [17]3 years ago
6 0

Answer:

a) P value = 0.0013

b) No, it is not plausible that the silicon content of the water is no greater than it was 10 years ago

Step-by-step explanation:

The null hypothesis here is “Mean is equal to 5” while alternate hypothesis is that “Mean is greater than 5”

Given  

Mean = 5, x’ = 5.4 and sigma = 1.2 and n = 85

Z = x-u’/sigma/sqrt n

Substituting the given values, we get –  

Z = 3.02

A) P value = 0.0013 which is less than 0.05 and thus we will reject the null hypothesis

B) There is enough evidence to reject the null hypothesis  

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xz_007 [3.2K]

Hey there!

3(q + 34)= 2

First distribute:

3(q) + 3(34)

3(q) = 3q

3(34) = 102

New equation: 3q + 102 = 2

Subtract by 102 on each of your sides:

3q + 102 - 102 = 2 - 102

Cancel out: 102 - 102 because it gives us 0

Keep: 2 - 102 because it helps us solve for our q

2 - 102 = - 100

New equation: 3q = -100

Divide both sides by 3

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Good luck on your assignment and enjoy your day!

~LoveYourselfFirst:)

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