answer.
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
nikklg [1K]
2 years ago
9

A university surveyed recent graduates of the English department for their starting salaries. Four hundred graduates returned th

e survey. The average salary was $25,000. The population standard deviation was $2,500. What is the 95% confidence interval for the mean salary of all graduates from the English department
Mathematics
1 answer:
NeX [460]2 years ago
3 0

Answer:

Step-by-step explanation:

We want to determine a 95% confidence interval for the mean salary of all graduates from the English department.

Number of sample, n = 400

Mean, u = $25,000

Standard deviation, s = $2,500

For a confidence level of 95%, the corresponding z value is 1.96. This is determined from the normal distribution table.

We will apply the formula

Confidence interval

= mean ± z × standard deviation/√n

It becomes

25000 ± 1.96 × 2500/√400

= 25000 ± 1.96 × 125

= 25000 ± 245

The lower end of the confidence interval is 25000 - 245 =24755

The upper end of the confidence interval is 25000 + 245 = 25245

Therefore, with 95% confidence interval, the mean salary of all graduates from the English department is between $24755 and $25245

You might be interested in
A girl had 20 coins in nickels and dimes whose sum was $1.40. She spent 65cents , using 8 coins. She now has ? nickels.
abruzzese [7]

Answer:

$0.75 nickels

Step-by-step explanation:

$1.40-$0.65=$0.75

$0.75 nickels

6 0
2 years ago
Read 2 more answers
A cylinder shaped dispenser holds 5,652 cubic centimeters of liquid soap and is now full. The radius of the dispenser is 7.5 cen
attashe74 [19]
We know that

[volume of cylinder]=pi*r²*h------------> h=[volume of cylinder]/(pi*r²)
Volume=5652 cm³
r=7.5 cm
so
 h=[5652]/(3.14*7.5²)-----------> h=32 cm

<span>the height of the soap in the full dispenser is 32 cm

</span><span>the height when 4,239 cubic centimeters of soap remains in the dispenser is
</span>h=[4239]/(3.14*7.5²)-----------> h=24 cm

hence

<span>the difference is 32-24--------> 8 cm
</span>
the answer is
8 cm

3 0
2 years ago
Read 2 more answers
The following graph shows the consumer price index (CPI) for a fictional country from 1990 to 2000.For which of these time perio
KatRina [158]

Answer:

Option B. 1990 - 1992

Step-by-step explanation:

If we have to calculate inflation rate in year 2000 from 1990, we use the formula

inflation=\frac{C.P.I. 2000-C.P.I. 1990}{C.P.I 1990}\times 100

which means if consumer price index is increasing year by year the inflation rate will increase.

Now we analyse our options given with the help of graph given.

A. from 1994 - 2000

Consumer price index increased from year 1994 to 1998 but decreased between 1998 to 2000.

So this option doesn't show the continuous inflation.

B. Year 1990 - 1992

We find a continuous increase in C.P.I. therefore there will be a continuous increase in inflation.

So this option is correct.

C. Year 1992 - 1996

In this gap we see deflation from year 1992 to 1994 then inflation between 1994 - 1996.

So there is ups and downs in this period showing discontinuity in inflation.

D. 1992 - 1994

There is continuous decrease in C.P.I. so continuous deflation is reported between this period.

It's not the correct option.

Answer is Option B.

4 0
2 years ago
A 20-inch diameter bicycle tire rotates 200 times.
fenix001 [56]

Answer: B)1,047 feet

Step-by-step explanation:

Hi, to answer this question, first, we have to calculate the circumference of the tire:

Circumference(C): π x diameter

C = π (20) = 62.83 inches.

Since 1 foot is equal to 12 inches.

62.83 ÷ 12 = 5.23 feet

Finally we have to multiply the result by 200:

5.23 x 200 = 1,047 feet

Feel free to ask for more if needed or if you did not understand something.

8 0
2 years ago
Convert 5 3/4 to a decimal round to the nearest tenth​
matrenka [14]

Answer: 5.75

Step-by-step explanation:

3/4=.75 then add the 5

6 0
2 years ago
Read 2 more answers
Other questions:
  • A population of short-finned fish and a population of long-finned fish live in a lake. Fish with long fins swim faster than fish
    11·1 answer
  • A street promotion worker gets paid $0.10 for each flyer he hands out. His goal is to make $16 an hour. How many flyers must he
    11·2 answers
  • Jenny has 550g of flour. She needs 0.5kg of flour for a recipe.when she has made her recipe,has many grams of flour will she hav
    11·1 answer
  • The lees rented a car for 4 weeks.The santos rented a car for 2 weeks.Whose weekly rentsl cost was lower?
    13·2 answers
  • The graph shows how many apples Erin can pick if she maintains a constant rate. What is the linear equation for this relationshi
    12·1 answer
  • On the island of liars each inhabitant lies with probability 2/3. You overhear an inhabitant making a statement. Next you ask an
    13·1 answer
  • Jenna concludes that (4,9) is the solution to the system of these two equations. which of the following justifies her conclusion
    5·1 answer
  • In a high school there are 1200 students. Estimate the probability that more than 130 students were born in January under each o
    12·1 answer
  • Ivy and cammie sold tulip and daffodil bulb packages for their spring fundraiser. Ivy sold 12 packages of tulip bulbs (X) and 14
    11·2 answers
  • Demand for Tablet Computers The quantity demanded per month, x, of a certain make of tablet computer is related to the average u
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!