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
mel-nik [20]
3 years ago
14

For males the expected pulse rate is 70 per second and the standard deviation is 10 per second. For women the expected pulse rat

e is 77 per second and the standard deviation is 12 per second. Let !X ¼ the sample average pulse rate for a random sample of 40 men and let !Y ¼ the sample average pulse rate for a random sample of 36 women.What is the approximate distribution of \overline{X}-\overline{Y} ? Justify your answer.
Mathematics
1 answer:
11Alexandr11 [23.1K]3 years ago
5 0

Answer:

Normal

Step-by-step explanation:

Given are the pulse rates average and std deviation for men and women.

Men Women Difference

Pulse rate per second 70 77 -7

Std dev per second 10 12  

Variance 100 144 244

n 40 36  

Variance/n 2.5 4 6.5

Std error   2.549509757

The first one represents X that of men and ii one that of women Y.

\bar X -\bar Y is Normal

Mean = difference in means

and Std dev of difference = \sqrt{\frac{\sigma_1^2 }{n_1} +\frac{\sigma_2^2 }{n_2}}

Thus using the above we calculate the distribution of difference of means is Normal with mean = -7 and std error = 2.5495

You might be interested in
Which best describes the equation that the graph represents?
hoa [83]

Answer:

third option

Step-by-step explanation:

time ('x') is the independent variable so that leaves only options 1 and 3 as the answer

is the slope equal to 0.6 or 1.8?

I used the slope formula with the following points:  (1,2) and (5,9)

(9-2) / (5-1) = 7/4 = 1.75, or 1.8

3 0
2 years ago
Y varies inversely as x. If y=5 and x=12, find y if x=4
yan [13]

Answer:

x igual 5 ,12,4

Step-by-step explanation:

xjxxixix

holghb

6 0
3 years ago
4x-5y+2x+4+6+9y+7x+2​
gtnhenbr [62]

Answer:

13x+4y+12

Step-by-step explanation:

Combine all the like terms & then solve:

(4x+2x+7x)+(-5y+9y)+(4+6+2)

13x+4y+12

4 0
2 years ago
Read 2 more answers
A bicycle store costs ​$2700 per month to operate. The store pays an average of ​$65 per bike. The average selling price of each
vladimir2022 [97]

Answer:$90

Step-by-step explanation:

how much they sell for $95 minus how much they cost $65 equals $30 then divid how much rent is $2700 by the $30 equals $90

or

$95-$65=$30

$2700÷$30=90

7 0
3 years ago
Can I get help on this question or an example? I would really appreciate it.
gulaghasi [49]

Answer:

B = 0.95m + 29.95

Step-by-step explanation:

this is really y = mx + b

m is a rate, 0.95 per mile

b is the y-intercept, or the price you pay no matter what, 29.95

8 0
2 years ago
Other questions:
  • Refer to the graphic novel frame below. Write and solve an equation to find how many movies they have time to show.
    5·1 answer
  • How many gigameters is 93 million miles and how? Plz Show your work.
    9·1 answer
  • The sun and volcanic eruptions influence earth's climate . choose one of these influences and research the effects it has on ear
    12·1 answer
  • 15.Identify the coordinates of point C after a translation with rule (x + 3, y 2).
    15·2 answers
  • Please this is a quiz and i forgot how to do this​
    10·1 answer
  • Find the rectangular prism with the given volume and height<br>V=96ft., h=8ft
    8·1 answer
  • What is the length of the line segment EF?
    9·1 answer
  • Can someone help me figure this out? -2(x+8)=6x+8
    7·1 answer
  • What is the factor for this expression:<br><br> 4x+20
    5·2 answers
  • How do I do 9 and 10?<br> If you can, write the steps too please and thanks
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!