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
disa [49]
3 years ago
8

The proportion of junior executives leaving large manufacturing companies within three years is to be estimated within 3 percent

. The 0.95 degree of confidence is to be used. A study conducted several years ago revealed that the percent of junior executives leaving within three years was 21. To update this study, the files of how many junior executives should be studied?
Also - for a question like this, how do we know what formula to use?
Mathematics
1 answer:
Leona [35]3 years ago
4 0

Answer: 709

Step-by-step explanation:

The formulas we use to find the required sample size :-

1. n=(\dfrac{z^*\cdot \sigma}{E})^2

, where \sigma = population standard deviation,

E = Margin of error .

z* = Critical value

2. n=p(1-p)(\dfrac{z^*}{E})^2 , where p= prior estimate of population proportion.

3. If prior estimate of population proportion is unavailable , then we take p= 0.5 and the formula becomes

n=0.25(\dfrac{z^*}{E})^2

Given : Margin of error : E= 3% =0.03

Critical value for 95% confidence interval = z*= 1.96

A study conducted several years ago revealed that the percent of junior executives leaving within three years was 21%.

i.e. p=0.21

Then by formula 2., the required sample size will be :

n=0.21(1-0.21)(\dfrac{1.96}{0.03})^2

n=0.21(0.79)(65.3333)^2

n=(0.1659)(4268.44008889)\\\\ n=708.134933333\approx709 [Round to the next integer.]

Hence, the required sample size of junior executives should be studied = 709

You might be interested in
Which graph represent me y= y=3√x-5 ( I can’t add all 4 of the graphs because it won’t let me attach 2 photos) BUT I REALLY NEED
Andrews [41]
I think this is the graph for your answer, for the next question like this, try to use "Desmos"

7 0
3 years ago
There are three car salespeople at the local car dealership. The table below shows how many cars each salesperson has sold. Help
drek231 [11]

Answer:

A. Ronald

Step-by-step explanation:

Divide the years of employment by cars sold. The highest number is your answer

7 0
3 years ago
Read 2 more answers
Find the 19th term of the arithmetic sequence whose common difference is =d5 and whose first term is =a12.
emmasim [6.3K]
An=a1+d(n-1)
a1=first term
d=common difference
n=which term

common difference is 5 first term is 2
an=5+2(n-1)
19th term is n=19
a19=5+2(19-1)
a19=5+2(18)
a19=5+36
a19=41

19th term is 41
4 0
3 years ago
Someone help,please.I don't understand very well.
Setler79 [48]
You just add THAM All up
8 0
3 years ago
Genius question: A long level railway bridge passes over a railroad track, which is 100 feet below it and at right angles to it.
nataly862011 [7]

Answer: <u>110 feet per second</u>

Step-by-step explanation:

In this problem we will assume that the car at 45 miles per hour is moving into the x direction with a high of 100 feet, and the train is going in the y direction, so they trajectories will made an angle of 90º.

Now we can calculate the speed of the trains in feet per second so:

S1=\frac{45*5280}{3600}=66

S2=\frac{60*5280}{3600}=88

So we can make a right triangle with sides 66 and 88 and the hypotenuse will be the rate that the trains will separate per second so:

h=\sqrt{66^{2} +88^{2} } =\sqrt{4356+7744}

h=\sqrt{12100}=110

Is important to have in mind that the initial high is not going to change how fast the trains will separate, however, if we are going to calculate the distance we should have it in the calculations.

7 0
2 years ago
Other questions:
  • A grid shows the positions of a subway stop and your house. The subway stop is located at (7, -7) and your house is located at (
    15·1 answer
  • Ruth Ann wants to research two different careers, medical doctor and astronaut.
    7·2 answers
  • Express 3.01 as a mixed number
    6·1 answer
  • What are the possible values of x in 8x^2+4x=-1
    9·1 answer
  • It took Everly 55 minutes to run a 10-kilometer race last weekend. If you know that 1 kilometer equals 0.621 mile, how many minu
    10·1 answer
  • Hey, i need help with these (image attached)
    13·1 answer
  • When Mei does 17 push-ups and 6 sit-ups, it takes a total of 35 seconds. In comparison, she needs 41 seconds to do 20 push-ups a
    13·1 answer
  • Please help on this math problem!!!! will mark brainliest!!!!
    9·2 answers
  • Help please. time is really hard for me! Thanks
    11·2 answers
  • How many solutions can be found for the equation 5x + 3(x − 1) = 10x − 2x − 3?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!