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
ikadub [295]
3 years ago
9

a. A simple random sample of size 80 has a mean of 7.31. The population standard deviation is 6.26. Construct a 99% confidence i

nterval for the population mean
Mathematics
1 answer:
Sever21 [200]3 years ago
5 0

Answer:

5.503484≤x≤9.116516

Step-by-step explanation:

The formula for calculating the CI is expressed as;

CI = x±z*s/√n

x is the mean= 7.31

z is the 99% z-score = 2.58

s is the standard deviation = 6.26

n is the sample size = 80

Substitute into the formula

CI = 7.31± 2.58*6.26/√80

CI = 7.31± 2.58*6.26/8.94

CI = 7.31± (2.58*0.7002)

CI = 7.31±1.806516

CI = (7.31-1.806516, 7.31+1.806516)

CI = (5.503484, 9.116516)

Hence the 99% confidence interval for the population mean is

5.503484≤x≤9.116516

You might be interested in
A water tank is 5m tall and has a diameter of 3,5m. Calculate the capacity (volume) of the tank. Use pi=3,14
aleksandr82 [10.1K]

Answer:

<h2>10000000000000</h2>

Step-by-step explanation:

<h2>minions </h2>
5 0
3 years ago
I dont know how to do this...<br>I need #48
agasfer [191]
Just switch the x and the 3
8 0
3 years ago
Read 2 more answers
Which are correct representations of the inequality –3(2x – 5) &lt; 5(2 – x)? Check all that apply.
Katyanochek1 [597]

The correct answer is –6x + 15 < 10 – 5x.

We can tell this by solving for x.

–3(2x – 5) < 5(2 – x) ----> Multiply to the parenthesis.

-6x + 15 < 10 - 5x ----> This is answer #3 and now we add 5x to both sides

-x + 15 < 10 ----> subtract 15 from both sides

-x < -5 ----> Divide by -1

x > 5 (Note that you have to change the direction of the sign when dividing by a -1. Therefore it does not match answer #1).

5 0
3 years ago
Heeeeeeeeeeelp pleaseeeeeeeeeeee
aleksandrvk [35]

Answer

<2 = <4 = <6 = <8

All of those are 94 degrees

<1 = <3 = <5 + <7

All of those are 86 degrees

Hope this helps :D

7 0
3 years ago
A vegetable store sold 3 tons of vegetables less on the first day than on the second, and on the third day it sold 5/9 of the am
Ilya [14]
Let
x---------> <span>quantity (ton) of vegetables sold the first day
</span>y---------> quantity (ton)  of vegetables sold the second day
z---------> quantity (ton) of vegetables sold the third day

we know that
x=y-3---------> equation 1
z=(5/9)*(x+y)------> equation 2
x+y+z=98-----> equation 3
substitute equation 2 in equation 3
x+y+[(5/9)*(x+y)]=98----> multiply by 9----> 9x+9y+5x+5y=882
14x+14y=882-----> equation 4

to resolve the equations system formed by
x=y-3
14x+14y=882

using a graph tool
see the attached figure
the solution is
x=30
y=33
x+y+z=98----> z=98-(x+y)----> z=98-63---> 35

the answer is
vegetables sold the first day----> 30 ton
vegetables sold the second day----> 33 ton
vegetables sold the third day------> 35 ton

8 0
3 years ago
Read 2 more answers
Other questions:
  • You deposit $9,800 in a money-market account that pays an annual interest rate of 5.8%. The interest is compounded quarterly. Ho
    11·2 answers
  • Answer fast plzzzzzzzz
    9·2 answers
  • Kelly Puts $350 in a savings account. The savings account Pinale
    12·1 answer
  • Ivan has just opened a small coffee shop. He paid a copy store $0.10 per copy to make 1,428 copies of the flyer to announce the
    14·1 answer
  • 15 POINTS! + BRAINLIEST.
    5·1 answer
  • What is the formula for area of a rectangle?
    8·1 answer
  • HELP ME PLEASE QUICK
    14·1 answer
  • What is the “B” value in a secant function?
    13·1 answer
  • What biotic factors do the organisms in Movile Cave rely on?
    8·1 answer
  • Solve.<br> <img src="https://tex.z-dn.net/?f=2%205%2F6%20%2B%20%28-1%204%2F12%29%20%3D" id="TexFormula1" title="2 5/6 + (-1 4/12
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!