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
pshichka [43]
2 years ago
6

In a study of 225 adults, the mean heart rate was 72 beats per minute. Assume the population of heart rates is known to be appro

ximately normal with a standard deviation of 10 beats per minute. What is the 90% confidence interval for the mean beats per minute?
Mathematics
2 answers:
Aleonysh [2.5K]2 years ago
3 0
<span> The lower and upper bounds of the confidence intervals must be equally distanced from the mean 
so it will be
</span><span>70.9 - 73.1 
</span>hope it helps
bonufazy [111]2 years ago
3 0

Answer:

Confidence interval lower bound = 72-1.097 = 70.903

                                Upper bound = 72+1.097=73.097

Step-by-step explanation:

In a study of 225 adults, the mean heart rate was 72 beats per minute

Hence sample size n = 225

sigma = population std deviation = 10

Sample std deviation = 10/sqrt 225 = 0.67

Since n is sufficiently large we can use Z critical value for finding confidence interval 90%

Two tailed z critical for 90% is 1.645

Margin of error = 1.645 *0.67=1.097

Confidence interval lower bound = 72-1.097 = 70.903

                                Upper bound = 72+1.097=73.097

You might be interested in
Distributive 8(4x+9)
Mariulka [41]

Answer: 32x + 72

Step-by-step explanation:

8*4x  +8*9

32x +72

3 0
3 years ago
What is the length of bc round to the nearest tenth]
GalinKa [24]

Answer:

you didn't show us the image to see bc

8 0
2 years ago
PLZ HELP I WILL MARK BRAINLEST, THANKS!
Andru [333]

Answer:

3, and b

Step-by-step explanation:

1. x =3

Because you have 3 little squares for one x

2. x= -12

b) 15+6=21

3 0
2 years ago
Read 2 more answers
The figure below shows a rectangular window
Alexxx [7]
Where is the figureeeee??
5 0
3 years ago
F(n)=x2+1<br> g(n)=2x-5<br> Find f(n)-g(n)
Artist 52 [7]
Answer:

x^2 - 2x + 6

Explanation:

(x^2 + 1) - (2x - 5)
x^2 + 1 - 2x + 5
x^2 - 2x + 6
8 0
3 years ago
Other questions:
  • Find the product. 3(m n)
    11·1 answer
  • On Tuesday, Allison earned $39.25 for watching the smith twins for 5 hours. How much does Allison get paid per hour to watch the
    7·2 answers
  • I need to write y=-2/-3+490 is function notation
    9·1 answer
  • How do you know if two polygons are similar?
    13·1 answer
  • What is the product of a number w and 737
    14·2 answers
  • What is the sum of 3 x 10 6 and 3 x 10 6?
    9·1 answer
  • Cynthia invests some money into a bank which pays 5% compound interest per year she wants it to be worth over £8000 at the end o
    9·1 answer
  • A class writes the equation n + n + 1 + n + 2 = 87 to solve the following problem.
    5·1 answer
  • A cheetah can run 60 miles per hour. A lion can
    14·2 answers
  • Write an expression equivalent to -4(x+3)-12x+5 that only has two terms
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!