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
iren2701 [21]
3 years ago
11

Fifty randomly selected individuals were timed completing a tax form. the sample mean was 23.6 minutes; the sample standard devi

ation was 2.4 minutes. a 99% confidence interval for the mean time required by all individuals to complete the form is about:
Mathematics
1 answer:
VLD [36.1K]3 years ago
5 0
Given:
n = 50, sample size
\bar{x} = 23.6 \, min, sample mean
s = 2.4 min, sample standard deviation.

The confidence interval is
\bar{x} \pm t^{*} \frac{s}{ \sqrt{n} }

At the 99% confidence level, t* (from the student's t-distribution) is 
t* = 2.68
Therefore
t*(s/√n) = 2.68*(2.4/√50) = 0.9096

The confidence interval is
(23.6-0.9096, 23.6+0.9096) ≈ (22.69, 24.51)

Answer: (22.7, 24.5)

You might be interested in
Kaci works at a bread store. She has 8 1/4 pounds of dough. She is making .75 pounds loaves. How many loaves will she be able to
ra1l [238]
Your answer would be 11 loaves of bread. If you need an exclamation let me know and I will talk you through it. Have a great day!
7 0
3 years ago
Read 2 more answers
Could someone please help and explain this to me
Lelu [443]

Answer:

Step-by-step explanation:

Four

Start by trying to understand what f(x) means. First of all it is the same thing as y in the equation given in question 4. It is a shorthand that tells you that you put an x in wherever you see an x on the right.

More important, it tells you what to put in for x on the right.

f(z) would tell you to put z in for x anywhere there is an x on the right.

f(z)=2z+1. It is just a shorthand to tell you what to do on the right.

f(2) means put a 2 in for the x on the right. Read all of this carefully. You need to know it.

f(2) = 2(2) + 1

f(2) = 4 + 1

f(2) = 5

=================

Five

f(x) = -x - 5            The minus 4 is not going to change what you do.

f(-4) = -(-4) - 5        Wherever you see an x you put in a minus 4

f(-4) = 4 - 5

f(-4) = - 1

======================

Just so you know, consider a more complicated example

f(x) = 20x^3 + 7x^2 + 4x + 19

Where ever you see an x put in 2

f(2) = 20*(2^3) + 7*(2^2) + 4(2) + 19

f(2) = 20*8 + 7*4 + 4*2 + 19

f(2) = 160 + 28 + 8 + 19

f(2) = 215

Note x can be anything the question tells you it is.

f(5) means put a 5 in for every x.

8 0
3 years ago
You are looking at a map of Texas. The scale indicates that 1 inch is equivalent to 100 miles. The distance on the map from Abil
rosijanka [135]

Answer:

200 miles

Step-by-step explanation:

1 inch = 100 miles

2 inch = 2*100 = 200 miles

5 0
3 years ago
I am<br> thinking of a #at least 13
steposvetlana [31]

Answer:

what do u mean

skjfjdkd

3 0
3 years ago
Want Brainliest? Get this correct Which of the following is the quotient of the rational expressions shown below? Make sure your
elena-14-01-66 [18.8K]

Answer:

B.

Step-by-step explanation:

First, notice that we can cancel out an x in the second term. Thus:

\frac{3x^2}{x^2+x} =\frac{3x^2}{x(x+1)} =\frac{3x}{x+1}

As with the last question, change the sign to multiplication and "flip" the second term:

\frac{2x-1}{x+1}\cdot \frac{x+1}{3x}

Multiply straight across:

=\frac{(2x-1)(x+1)}{(x+1)(3x)}

Cancel the (x+1) term:

=\frac{2x-1}{3x}

Cannot be simplified further.

B.

4 0
3 years ago
Other questions:
  • Alina spends 60% of her monthly income of rs 35000.what is her savings?find it.​
    10·2 answers
  • Simplify s-8/s^2-14s+8
    7·1 answer
  • The expression 1.7j−3.4 factored is
    11·1 answer
  • Let f (x)=X2 -x. if (x)=132, then what is the value of x?
    11·1 answer
  • Simplify 5-[2-(-4)-6]
    7·1 answer
  • FIRST PERSON WHO ANSWERS THIS CORRECTLY GETS BRAINLIEST
    11·1 answer
  • PLSSS HELP IMMEDIATELY!!! ILL GIVE BRAINIEST!!! (if u provide a link, i’m not giving u brainiest!)
    15·2 answers
  • I dont know how to do this and its long, 30 points who ever gets it right
    14·1 answer
  • A bicycle has a speed of 6 m/s. What is its speed in km/h?<br> (1 km=1000 m)<br> (1 h = 3600 s)
    14·1 answer
  • Help..<br> only if you know
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!