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
puteri [66]
3 years ago
9

We draw a random sample of size 25 from a normal population with variance 2.4. If the sample mean is 12.5, what is a 99% confide

nce interval for the population mean?
Mathematics
1 answer:
Helen [10]3 years ago
7 0

Answer:

<h2>11.2≤\mu12.8 </h2>

Step-by-step explanation:

Confidence interval for the population mean is expressed by the formula;

CI = xbar ± Z(S/√n) where;

xbar is the sample mean = 12.5

Z is the z score at 99% confidence = 2.576

S is the standard deviation = √variance

S = √2.4 = 1.5492

n is the sample size = 25

Substituting the given values into the formula given above,

CI = 12.5 ± 2.576(1.5492/√25)

CI = 12.5 ± 2.576(0.30984)

CI = 12.5 ± 0.7981

CI = (12.5-0.7981, 12.5+0.7981)

CI = (11.2019, 12.7981)

Hence the 99% confidence interval for the population mean is 11.2≤\mu12.8 (to 1 decimal place)

You might be interested in
There are 1,994 strawberries picked from the farmif the strawberries are sorted equally into six bins, how many strawberries wil
irakobra [83]

Answer:

332

the reason why I think it's $332 is because if you do 1,994 / 6 then that equals 332 I don't know if you get it right if you do great job if you don't I understand

7 0
2 years ago
MATH HELP
Dmitry_Shevchenko [17]

Answer:

1.75 miles

Step-by-step explanation:

If he rides around his block 3 times it is 1.5 miles and if he only rides around his block half-way not a time it is a quarter of a mile added on instead of a half.

6 0
3 years ago
Read 2 more answers
What is the decimal equivalent of 32?<br> O A. 0.28125<br> B. 35<br> C. 3.5<br> D. 32.9
Arturiano [62]
D
Because it is the same while number just with a extra .9
8 0
3 years ago
Does1/3 &amp; 7/21 form a proportion
lesantik [10]
Because 1 * 21 = 3 * 7 ( 21  = 21 ) , 1/3&7/21 form a proportion.
8 0
3 years ago
Im bo.red how is everyones day going?​
Free_Kalibri [48]
Bored but i have criminology right now :/
4 0
3 years ago
Read 2 more answers
Other questions:
  • In the decimals chart, the memory cue for dividing by a whole number is "up." what does that mean?
    13·2 answers
  • 20 Points! Please Help!
    13·1 answer
  • What is the monthly payment rate for a $20,000 loan for 4 years with an annual interest rate of 4.8%
    12·1 answer
  • Multiply. Express your answer in simplest form. 5/8, 24
    11·2 answers
  • An aquarium measures 11 feet wide, 10 feet long and 7 feet deep. Approximately how many gallons of water does it hold if there a
    11·1 answer
  • 1)
    7·2 answers
  • Help!<br> Algebraic Relationship <br> y= x/4-1
    5·1 answer
  • Find the product of 2x2(x + 6). Group of answer choices 8x3 2x3 + 12x2 3x3 + 12x2 2x2 + x + 6
    9·1 answer
  • Consider the numbers 4 and √5. Which operation(s) will result in an irrational number?
    5·1 answer
  • An instructor asked her students how much time (to the nearest hour) they spent studying for the midterm. The data are displayed
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!