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
kodGreya [7K]
3 years ago
15

A chemist examines 15 geological samples for potassium chloride concentration. The mean potassium chloride concentration for the

sample data is 0.376 cc/cubic meter with a standard deviation of 0.0012. Determine the 95% confidence interval for the population mean potassium chloride concentration. Assume the population is approximately normal.
Required:
Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.
Mathematics
1 answer:
Lelu [443]3 years ago
5 0

Answer:

95% Confidence interval: (0.375,0.377)

Step-by-step explanation:

We are given the following in the question:

Sample mean, \bar{x} = 0.376 cc/cubic meter

Sample size, n = 15

Alpha, α = 0.05

Sample standard deviation, s = 0.0012

Degree of freedom =

=n-1\\=15-1\\=14

95% Confidence interval:  

\bar{x} \pm t_{critical}\displaystyle\frac{s}{\sqrt{n}}  

Putting the values, we get,  

t_{critical}\text{ at degree of freedom 14 and}~\alpha_{0.05} = \pm 2.145  

0.376 \pm 2.145(\dfrac{0.0012}{\sqrt{15}} )\\\\ = 0.376 \pm 0.0006\\\\ = (0.3754,0.3766)\approx (0.375,0.377)  

(0.375,0.377) is the required 95% confidence interval for the population mean potassium chloride concentration.

You might be interested in
-7d>105 what is the solution?
Jet001 [13]

Answer:

d <-15

In interval notation

(-∞,-15)

Step-by-step explanation:

-7d>105

Divide each side by -7. remembering to flip the inequality

-7d/-7 < 105/-7

d <-15

3 0
3 years ago
Read 2 more answers
Math problem
dezoksy [38]
No problem just ask me anything and I will be loved to answer anyone question
6 0
3 years ago
⎪6 − 4⎪ − ⎪3 − 8⎪ = ?<br> Please help!!!!
andriy [413]

Answer:

-3

Step-by-step explanation:

Numbers that come out of the absolute values are always positive.

|6 - 4| -|3 - 8| =

| 2| - | -5| =

2 - 5 =

-3

3 0
3 years ago
Can someone please help me?
cricket20 [7]

Answer:

n ≤

\frac{9}{8}

The graph is attached

7 0
3 years ago
-4/5 to the power of 2 times -3/50
Crazy boy [7]
=(-4/5)^2 * -3/50
square -4/5 first; remember -4/5^2 is the same as -4/5 * -4/5

=(-4/5 * -4/5) * -3/50
multiply -4 numerators; multiply 5 denominators

=(-4 * -4)/(5 * 5) * -3/50

=16/25 * -3/50
multiply numerators 16 & -3; multiply denominators 25 & 50

=(16 * -3)/(25 * 50)
= -48/1250

simplify by 2
= -24/625 (or -0.0384)


ANSWER: -24/625 (or -0.0384)

Hope this helps! :)
6 0
3 years ago
Read 2 more answers
Other questions:
  • At a summertime poolside snack bar, 200 ice cream scoops were sold in one day. Double scoops were sold for $1.25 each and single
    12·2 answers
  • What value is missing from the table?
    7·2 answers
  • What is the rule for a counterclockwise rotation about the origin of 210°
    13·1 answer
  • Tomas used 65% of a dollar to purchase a highlighter. Write the percent as a fraction, as a dollar amount, and a decimal.
    10·1 answer
  • The cost of tuition at Johnson Community College is $160 per credit hour. Each student also has to pay $50 in fees. Model the co
    10·1 answer
  • 40 POINTS
    15·1 answer
  • I like ya cut g gottie
    8·2 answers
  • <img src="https://tex.z-dn.net/?f=y%20%3D%20%20%5Cfrac%7Bx%20-%20r%7D%7Bx%20%2B%20r%3F%7D%20find%20%5C%3A%20the%20%5C%3A%20subje
    6·1 answer
  • Turner has 6 pounds of pasta. Each time he makes dinner he uses 0.75 pound
    12·1 answer
  • What is -9+(-6)-7-(-12) simplified?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!