1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Mice21 [21]
2 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]2 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  

You might be interested in
A die was rolled eight times. The rolls were 2, 2, 3, 4, 4, 5, 6, and 6. What is the mean absolute deviation for this data? A) 1
adoni [48]

Answer:

The correct option is A:

MAD = 1 + 1/4

Step-by-step explanation:

For a set of N elements {x₁, x₂, ..., xₙ}

The mean is calculated as:

M = \frac{x_1 + x_2 + ... + x_n}{N}

And the mean absolute deviation is calculated as:

MAD = \frac{Ix_1 - MI + Ix_2 - MI + ...+ IX_n - MI}{N}

Here we have the set of 8 elements:

{ 2, 2, 3, 4, 4, 5, 6, 6}

The mean of this set is:

M = (2 + 2 + 3 + 4 + 4 + 5 + 6 + 6)/8 = 4

Then the mean standard deviation is:

MAD = \frac{I2 - 4I + I2 - 4I + I3 - 4I + I4 - 4I + I4 - 4I + I5 - 4I + I6 - 4I + I6 - 4I}{8} = 10/8

If we simplify this, we get:

MAD = 10/8 = 5/4  = (4 + 1)/4 = 4/4 + 1/4 = 1 + 1/4

MAD = 1 + 1/4

The correct option is A.

6 0
2 years ago
How many whole numbers are there up to 100, including 100?​
vladimir2022 [97]

Answer:

100

Step-by-step explanation:

because... LOGIC

5 0
3 years ago
Solve this inequality for x. 81-1 1/5 x <55
katen-ka-za [31]

Answer:

A. x > 21 2/3

Step-by-step explanation:

x is greater than 21 and two thirds

i did the math :]

4 0
3 years ago
Which expression cannot be used to calculate the sale price of a fish tank that was originally at priced d dollars and is on sal
Drupady [299]
Where S is sales price,
S = .75d

You said which expression CANNOT be used, but I assume you mean can. Let me know if you didn’t.
3 0
2 years ago
6. <br> Find the value of y. <br> 160° <br> 60° <br> 50°
prohojiy [21]

Answer:

where is the figure

Step-by-step explanation:

u should upload the figure too

6 0
3 years ago
Other questions:
  • Which value of the y in the table would be least likely to indicate an association between the variables
    6·1 answer
  • Which is an example of the associative property?
    13·2 answers
  • This is a literal equation.
    8·2 answers
  • Find the center, vertices, and foci of the ellipse with equation x squared divided by 36 plus y squared divided by 100 = 1
    10·1 answer
  • Which expression is equivalent to 2(x + 5) for all values of x? A) 2x + 5 B) x + 10 C) 2x + 7 D) 2x + 10
    13·1 answer
  • ∠A and \angle B∠B are vertical angles. If m\angle A=(2x+26)^{\circ}∠A=(2x+26) ∘ and m\angle B=(3x+21)^{\circ}∠B=(3x+21) ∘ , then
    15·1 answer
  • Find the measure of angle b
    8·2 answers
  • What is the median of this data set?<br><br> 8, 6, 0, 11, 10, 5
    10·1 answer
  • Angle 1 is 3 times angle 2. Find angle 2
    14·1 answer
  • In football, a gain is when a player moves the ball closer to the goal line; whereas, a loss is when the player loses yardage ma
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!