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
docker41 [41]
3 years ago
8

A human resource manager for a large company takes a random sample of 60 employees from the company database. Based on the sampl

e she calculates a 95% confidence interval for the mean time of employment for all employees to be 8.7 to 15.2 years. Which of the following will provide a more informative (i.e., narrower) confidence interval than the 95% confidence interval?
A. Using a 90% confidence level (instead of 95%)
B. Using a 99% confidence level (instead of 95%)
C. Using a sample size of 40 employees (instead of 60)
D. Using a sample size of 90 employees (instead of 60)
Mathematics
1 answer:
goldfiish [28.3K]3 years ago
5 0

Answer:

A. Using a 90% confidence level (instead of 95%)

D. Using a sample size of 90 employees (instead of 60)

Step-by-step explanation:

The margin of error of a confidence interval is given by:

M = z*\frac{\sigma}{\sqrt{n}}

In which z is related to the confidence level, \sigma is the standard deviation of the population and n is the size of the sample.

The higher the margin of error, the less precise the confidence interval is.

We have:

A 95% confidence interval, with a sample of 60.

We want to make it more precise:

Two options, decrease z(decrease the confidence level), or increase n(increase the sample size).

So the correct options are:

A. Using a 90% confidence level (instead of 95%)

D. Using a sample size of 90 employees (instead of 60)

You might be interested in
Rose has $83. She is saving up for a new bike. If she saves $15 per week, how much money will she have after 8 weeks?
bonufazy [111]

Answer:

$203

Step-by-step explanation:

15x8=$120

120+83=$203

7 0
3 years ago
Read 2 more answers
What is the multiplicative inverse of 1/16 ?
andrey2020 [161]

Answer:

16/1 I think

Step-by-step explanation:

8 0
3 years ago
If i go into an ice cream parlor, and i have the choice of having one of 10 different flavors, with one of 5 different toppings
horrorfan [7]
35 hope this helps with the problem
7 0
3 years ago
Ryan conducted a 6-day study observing the effects of an organic plant food on the growth of his sprouting bean plant. He tracke
Artemon [7]

Answer:

B: This relationship is not a function because more than one amount of plant food remains each day

Step-by-step explanation:

It is given that Ryan did an experiment by observing the effects of plant food and the growth of the sprouting bean plant. He made a note of the height of the bean plant and the amount of food remaining in the container for the plant after feeding each day.

Thus he observed that the plant food in the container decreases by an equal amount everyday as the bean plant grew. Thus this states that it is not a  function between the two as there are more than one plant food remaining each day for the plant.

A relationship is a function when one element belongs to one thing.

4 0
3 years ago
Let f(X) = (x^7(x-6)^8)/(x^2+5)^9
Iteru [2.4K]
Download math papa.... helped me tremendously
3 0
3 years ago
Other questions:
  • A number has 2 tens and 15 ones. Write the number in words.
    5·2 answers
  • Tom has a £10 note and a £5 note.
    5·1 answer
  • Please help me out with this!!!!!!
    8·2 answers
  • The table below shows the total cost (TC) and marginal cost (MC) for Choco Lovers, a monopolistic firm producing different quant
    10·1 answer
  • Three machines operating independently, simultaneously, and at the same constant rate can fill a certain production order in 36
    5·1 answer
  • Explanation NEEDS to be included! No fake answers please! Brainliest for the best! Thank You!
    11·2 answers
  • Pls pls pls help!!!!!!
    12·1 answer
  • Find the percent of decrease or increase, Round to the nearest tenth of a percent.
    15·1 answer
  • Simplify. Express your answer using exponents.<br> (5m^2n^8)^3<br> Answer: _
    11·2 answers
  • Find the distance between the points.<br> (7,9) and (-1,9)
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!