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
Artist 52 [7]
3 years ago
11

A sample of 100 janitors in a certain school district found that the average time each janitor had worked for the school distric

t was 8 years. Suppose we know that the standard deviation of the population is s=5 years. Construct a 95% confidence interval for the mean time of the population of janitors have spent with the school district.
A) 8±1.98
B) 8±0.82
C) 8±0.71
D) 8±1.53
E) 8±0.98
Mathematics
1 answer:
Crank3 years ago
8 0
First, we get the standard error of the mean using
σm = σ / √N
= 5 / √100
= 0.5

Next, we subtract and add 1.96 standard deviations from the mean (since the confidence interval is 95%). So,
8 ±1.96 (0.5)
= 8 <span>± 0.98

The answer is
</span>E) 8±0.98
You might be interested in
At a local restaurant the health inspector visits every 7 days and the fire inspector every 12 days
Masja [62]
Two visits are from the fire inspector and four visits are from the health inspector in 30 days both inspectors will visit on the same day
6 0
3 years ago
1) State the area of the given trapezoid.
Ber [7]

Answer:

The answer would be 26

Step-by-step explanation:

First I divided the shape to make a rectangle and a right  angle triangle, then i calculated the shape of the rectangle which came out to be 20. After that I calculated the area of the right angle triangle which is 6. So The answer would be 6 + 20 = 26

5 0
2 years ago
Uhhhhh please help asaapp​
trapecia [35]

Answer:

sorry

Step-by-step explanation:

4 0
2 years ago
Which expression is equivalent to 100 in exponential form? A) 102 B) 210 C) 10 × 10 D) 4 × 25
Paul [167]

Answer:

A) 10^2

Step-by-step explanation:

100 is 10 times 10 or 10 to the second power

100 = 10 * 10 = 10 ^2

6 0
3 years ago
Help asap plsss.......
Yakvenalex [24]

Answer:

negative 5 degrees Celsius

8 0
2 years ago
Other questions:
  • How many possible weight's are there between 10 and 40 pounds
    10·2 answers
  • A sea bird is 28 meters above the surface of the ocean. What is its elevation?
    11·1 answer
  • Q + 12 - 2 (q-22)&gt;0<br><br><br><br> step by step please hurry ); &lt;3
    7·2 answers
  • Tommy has 6 more than 3 times the amount of money in his bank account than Judy. Judy has $7500 more than a number in her accoun
    6·1 answer
  • Please help steps thx
    12·1 answer
  • Triangle ABC has vertices A (0, 2), B (5, 4), and C (5, 0). Triangle A′B′C′ has corresponding vertices A′ (–5, –1), B′ (0, 1), a
    6·2 answers
  • Factor the following polynomial.<br> 98x3 – 18x
    5·2 answers
  • HURRY PLS
    15·1 answer
  • Laura goes to a bank and opens a new account . She deposits $5,500. • The bank pays 1.6% interest compounded annually on this ac
    5·1 answer
  • Find the area of the figure
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!