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
lutik1710 [3]
3 years ago
7

You measure the lifetime of a random sample of 25 rats that are exposed to 10 Sv of radiation (the equivalent of 1000 REM), for

which the LD 100 is 14 days. The sample mean is = 13.8 days. Suppose that the lifetimes for this level of exposure follow a Normal distribution, with unknown mean μ and standard deviation σ = 0.75 day. What is the 95% confidence interval for μ based on these data?
Mathematics
1 answer:
Slav-nsk [51]3 years ago
4 0

Answer:

CI 95%(μ)= [13.506 ; 14.094]

Step-by-step explanation:

The confidence interval (CI) formula is:

CI (1-alpha) (μ)= mean+- [(Z(alpha/2))* σ/sqrt(n)]

alpha= is the proportion of the distribution tails that are outside the confidence interval. In this case, 5% because 100-90%

Z(5%/2)= is the critical value of the standardized normal distribution. In this case is 1.96

σ= standard deviation. In this case 0.75 day

mean= 13.8 days

n= number of observations . In this case 25

Then, the confidence interval (90%) is:

CI 95%(μ)= 13.8+- [1.96*(0.75/sqrt(25)]

CI 95%(μ)= 13.8+- [1.96*(0.75/5) ]

CI 95%(μ)= 13.8+- (0.294)

CI 95%(μ)= [13.8-0.294 ; 13.8+0.294]

CI 95%(μ)= [13.506 ; 14.094]

You might be interested in
HELP PLEASE!! i just need #8 through #10
Nady [450]

Answer:

ok hi 4___________$_______

6 0
2 years ago
Can someone pls pls pls help me Evaluate the expression 6.908 – g for g = 0.173.
Serjik [45]

Answer:

6.735

Step-by-step explanation:

im smart

4 0
3 years ago
Hi what is the answer for this?
saw5 [17]
This is a common factor problem.

Pencils come in a pack of 12
Erasers come in a pack of 10

First, break the number into their prime factors(the idea is that we will break the number down into its smallest multiples, which are prime numbers):
10 = 2 * 5
12 = 2 * 2 *3

So now we take the unique multiples of each number, and when we multiply them together, we will get the smallest number that both 10 and 12 can be divided into(this is what the problem is asking for)
We have (2*2*3) that comes from 12, and the only unique number that comes from the 10 is (5)
So now, we multiply:
2*2*3*5=60
However, this isn't exactly out answer. Now we have to divide our answer by the number of each this in the pack to know how many packs to buy.
60/12=5 packs of pencils
60/10= 6 packs of erasers

I hope this helps. Let me know if you have any questions!!
5 0
3 years ago
Read 2 more answers
Given g(x)=-2x-1g(x)=−2x−1, find g(-4)g(−4)
nydimaria [60]

Answer:

7

Step-by-step explanation:

4 0
3 years ago
I need the steps too
Musya8 [376]

Answer:

x =10

Step-by-step explanation:

7(3x-1)-(x+5)

21x-7-x+5

20x-2=-52

x=20÷2

6 0
2 years ago
Other questions:
  • Give the angle measure represented by 2 rotations clockwise
    10·2 answers
  • The bulls eye on an archery target has a radius of 3 inches. the entire target has a radius of 9 inches. to the nearest tenth, f
    6·1 answer
  • Please answer this correctly
    9·1 answer
  • the length of the base of a triangle is twice its height. if the area of the triangle is 4 square kilometers, find the height
    9·2 answers
  • HELP I NEED THIS SOLVED IN SIMPLEST FORM!!<br> 5/6 + 1/2 =
    5·2 answers
  • 3 What force is needed to accelerate a 0.5-kg football at a rate<br> of 40 m/s 2?
    14·1 answer
  • Let t=4 and u=6+2i. Find t+u.
    11·2 answers
  • The regular price for a pair of jeans is $36. the sale price is 45% off the regular price. What is the sale price of jeans?
    5·1 answer
  • What is the exponential expression for the numerical expression ​14⋅14⋅14⋅14​?
    10·2 answers
  • Evaluate 10 + 8÷4 - 12
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!