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
Talja [164]
3 years ago
14

a previous analysis of paper boxes showed that the standard deviation of the length is 9mm. What is the 98% confidence interval

for the average length of a box. How many boxes does he need to measure to be accurate within 3 millimeters.
Mathematics
1 answer:
il63 [147K]3 years ago
6 0
We cannot calculate the confidence interval without the sample size.  However, for the second question, the sample size needed would be 49.

The formula we use is

n=(\frac{z_{\frac{\alpha}{2}}\times \sigma}{E})^2

To find the z-score:
Convert 98% to a decimal:  0.98
Subtract from 1:  1-0.98 = 0.02
Divide by 2:  0.02/2 = 0.01
Subtract from 1:  1-0.01 = 0.99

Using a z-table (http://www.z-table.com) we see that this value is closest to a z-score of 2.33.

Using the z-score, our standard deviation (9) and our margin of error (3), we have:
n=(\frac{2.33(9)}{3})^2=(6.99)^2=48.86\approx 49
You might be interested in
4. Lydia cut out her initial from a piece<br><br> of construction paper,
Ratling [72]

Answer:

Option A is correct.

10 square centimeters.

Step-by-step explanation:

Complete Question

The complete Question is attached in the first attached image.

Lydia cut out her initial from a piece of construction paper. How many square centimeters of construction paper are used to make Lydia's initial?

A) 10 square centimeters

B) 11 square centimeters

C) 15 square centimeters

D) 22 square centimeters

Solution

From the second attached image, it is evident that we can split the L-shaped figure into two rectangles of dimensions (3 cm by 1 cm) and (7 cm by 1 cm)

The total area of the figure is thus

(3 × 1) + (7 × 1) = 10 cm²

Hope this Helps!!!

3 0
3 years ago
What's 600 out of 100 as a mixed number?
larisa [96]
600/100 as a mixed number would be 6
5 0
3 years ago
Read 2 more answers
sand falls from an overhead bin and accumulates in a conical pile with a radius that is always four times its height. suppose th
blagie [28]

Answer:

\frac{dv}{dt} =7239.168 cm/sec

Step-by-step explanation:

From the question we are told that:

Rate \frac{dh}{dt}=1cm

Height h=12cm

Radius r=4h

Generally the equation for Volume of Cone is mathematically given by

V=\frac{1}{3}\pi r^2h

V=\frac{1}{3}\pi (4h)^2h

Differentiating

\frac{dv}{dt} =\frac{16}{3}\pi3h^2\frac{dh}{dt}

\frac{dv}{dt} =\frac{16}{3}*3.142*3*12^2*1

\frac{dv}{dt} =7239.168 cm/sec

7 0
3 years ago
4. In this figure, B↔A↔
LenaWriter [7]

Answer:

B. 25 degrees

Step-by-step explanation:

i think

6 0
3 years ago
Corinne earns an hourly wage on top of her weekly gas allowance for her delivery job. Her weekly earnings can be shown using the
sveta [45]
How much money he gets per hour
8 0
3 years ago
Read 2 more answers
Other questions:
  • Write six and seven hundred one-Thousands in standard form
    12·1 answer
  • I REALLY NEED HELP!! WILL MARK BRAINLIEST!
    5·2 answers
  • Maryland's snowfall total for december was 1.43 inches and for January is was 12.67 inches
    13·1 answer
  • 15-g=23-2g math please help
    7·1 answer
  • Pls help me answer this question
    14·1 answer
  • PLEASE I NEED HELP WILL GIVE BRAINLY!!! HELP ME FIND THE SLOPE AND Y INTERCEPT AND WRITE IT IN Y=MX+B FORM !!!​
    9·2 answers
  • Which is greater? 12.045 or 12.54
    8·1 answer
  • Which of the following would earn the same amount of interest as a $600 principal with 2.5%
    13·1 answer
  • A sales person at a car dealership earns a monthly salary of $2400 and $250 for each vehicle sold
    12·1 answer
  • The melting point of nitrogen is -210 °C. The melting point of magnesium is 650 °C.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!