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
likoan [24]
3 years ago
15

AARP reported on a study conducted to learn how long it takes individuals to prepare their federal income tax return (AARP Bulle

tin, April 2008). The data contained in the WEBfile named TaxReturn are consistent with the study results. These data provide the time in hours required for 40 individuals to complete their federal income tax returns. Using past years' data, the population standard deviation can be assumed known with σ = 11 hours.What is the 95% confidence interval estimate of the mean time it takes an individual to complete a federal income tax return? Round your answer to one decimal place.____ to ___ hoursReturn Preparation Time(Hours)35.330.537.426.513.049.928.844.061.60.540.534.947.936.624.139.847.818.536.639.214.537.340.549.345.528.319.55.652.641.445.339.033.729.414.540.133.736.95.633.7
Mathematics
1 answer:
Crank3 years ago
6 0

Answer:

Confidence interval: (30.1,36.9)

Step-by-step explanation:

We are given the following data set:

35.3,30.5,37.4,26.5,13.0,49.9,28.8,44.0,61.6,0.5,40.5,34.9,47.9,36.6,24.1,39.8,47.8,18.5,36.6,39.2,14.5,37.3,40.5,49.3,45.5,28.3,19.5,5.6,52.6,41.4,45.3,39.0,33.7,29.4,14.5,40.1,33.7,36.9,5.6,33.7

Formula:

\text{Standard Deviation} = \sqrt{\displaystyle\frac{\sum (x_i -\bar{x})^2}{n-1}}  

where x_i are data points, \bar{x} is the mean and n is the number of observations.  

Mean = \displaystyle\frac{\text{Sum of all observations}}{\text{Total number of observation}}

Mean =\displaystyle\frac{1339.9}{40} = 33.5

S.D = 11(given)

n = 40

Confidence interval:

\mu \pm z_{critical}\frac{\sigma}{\sqrt{n}}

Putting the values, we get,

z_{critical}\text{ at}~\alpha_{0.05} = 1.96

33.5 \pm 1.96(\frac{11}{\sqrt{40}} ) = 6.34 \pm 3.4 = (30.1,36.9)

You might be interested in
A four-pack of 42-ounce ink cartridges sells for $85.99. The expression 42c represents the amount of ink in a number of cartridg
anastassius [24]
C represents the number of four-packs of cartridges because the question says there are 4 pack of 42 ounceink cartridges that sell for 85.99...If you were ever to create an equation with this it would be 42c = 85.99 
And you can plug in 4, 8, or 16 for c and check how much they would cost over all...your welcome, have a great day
7 0
3 years ago
Read 2 more answers
Which graph comparing time and dollars would be best represented by an exponential function?
Rasek [7]

Answer:

x and y

Step-by-step explanation:

because it make sense

6 0
3 years ago
Read 2 more answers
Please solve!!! Bbkakakaj
sdas [7]

Answer:

B is the answer because yes

6 0
2 years ago
Simplify 4/7 + 5/6 whoever possible
Pani-rosa [81]

Hey there!

4/7 + 5/6

≈ 24/42 + 35/42

≈ 24 + 36/ 42 - 0

≈ 59/42

≈ 1 17/42



Therefore, your answer is:

59/42 or 1 17/42

EITHER OF THOSE SHOULD WORK BECAUSE THEY ARE EQUIVALENT.


Good luck on your assignment & enjoy your day!



~Amphitrite1040:)

5 0
2 years ago
Is one over eight irrational or rational
lukranit [14]
The answer to this is irrational
4 0
3 years ago
Other questions:
  • What is 186/100 as a fraction in simplest form?
    12·2 answers
  • Why is -3 an integer?
    10·2 answers
  • A rectangular park is 100 yards long and 65 yards wide. Give the length and width of another rectangular park that has the same
    13·1 answer
  • For one month Siera calculated her home town's average high temperature in degrees Fahrenheit. She wants to convert that tempera
    11·2 answers
  • The total cost of 8 binders is $24. The price of each binder is the same. Which equation represents the proportional relationshi
    5·1 answer
  • Which side in the image corresponds to Side length T V in the pre-image? Side length U T Side length V U Side length T S Side le
    10·1 answer
  • Ariana bought 5 dozen pears at $36 per dozen . She discovered that 7 were rotten and she sold the rest at $4.50 each . Calculate
    7·2 answers
  • Joni sold 376 tickets for the school play. Student tickets cost $4 and adult tickets cost $7. Joni’s sales totaled $2080.
    9·2 answers
  • Given m||n, find the value of x.<br> kt<br> (6x-3)<br> &gt;m<br> (2x+13)<br> Please help me
    7·1 answer
  • This table shows the change in temperature x hours after sunset.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!