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]
3 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]3 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]3 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
Please help! ASAP, no bots.
harkovskaia [24]

Answer:

perfect square (4x - 3)^2

Step-by-step explanation:

3 0
3 years ago
Two random samples were taken to determine how often people in a community listen to the local radio station each month.
tangare [24]
I do not get what the Question that you are asking is.

4 0
3 years ago
Choose the equation for the graph below
Alex Ar [27]
The answer to your question is “D”

Btw you can use DESMOS for future questions like this
8 0
3 years ago
F(x) =2x^2+4x+5<br> Find: f(a)
MA_775_DIABLO [31]

Answer:

F(a) =2a^2+4a+5

Step-by-step explanation:

just put x= a

5 0
3 years ago
What kind of triangle has a 52° angle and an 83° angle
charle [14.2K]
Almost positive isosceles triangle
7 0
3 years ago
Other questions:
  • An 8ft length of 4 inch wide crown molding costs $14. How much will it cost to buy 32 ft of crown molding?
    9·1 answer
  • Solve this answer for me and explain it e/2&lt;-0.5
    9·1 answer
  • Which inequality best represents the situation of players on the jonior varsity volleyball team must weigh more than 99 pounds ?
    14·2 answers
  • What is the interquartile range of this data set. 4,5,7,9,10,14,16,24
    13·1 answer
  • What is the value of x in this equation?<br><br> 2x – 12 = -52
    7·2 answers
  • I need a good answer and an explanation, please
    15·1 answer
  • X+x+y+y+z+z=24
    5·1 answer
  • Alfonso and Gracie have decided to join a gym! Gracie found a gym that costs $20 to join and charges $4 per class. Alfonso found
    14·1 answer
  • Find x<br> 25<br> 7<br> Х<br> PLEASE HELP
    13·1 answer
  • Plz help me If u do u are smart and gain 10 pts
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!