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
Vikentia [17]
3 years ago
12

2. Two researchers, Beth and Frank, ask a random sample of teenagers whether or not they had

Mathematics
1 answer:
Veseljchak [2.6K]3 years ago
7 0

Answer:

Frank's confidence interval, (.75, .89) has to be wrong.

The explanation is presented below.

Step-by-step explanation:

The Confidence Interval for the population proportion is basically an interval of range of values where the true population proportion can be found with a certain level of confidence.

Mathematically,

Confidence Interval = (Sample proportion) ± (Margin of error)

Margin of Error is the width of the confidence interval about the mean.

So, a sample proportion of 80% indicates that Beth's interval of (.73, .87) gives a margin of error of 7%.

Making the lower limit of the interval be

(Sample proportion) - (Margin of error) = 80 - 7 = 73%

Upper limit of the interval = (Sample proportion) + (Margin of error) = 80 + 7 = 87%

Hence, this confidence interval is plausible for the survey carried out.

But Frank's interval of (.75, .89) doesn't work with the definition of a confidence interval given above. The range has to be equally spread around the mean with (lower limit, upper limit). The lower limit cannot be 75 and the upper limit 89.

If the lower limit is truly 75, the margin of error has to be (80 - 75), 5%. And the corresponding upper limit should be (80 + 5), 85%.

Frank's interval as (.75, .85) would have been more plausible.

And if the upper limit is truly 89%, the fiitting lower limit, judging by the distance of the upper limit from the sample proportion (89 - 80 = 9%), should be (80 - 9), 71%. Frank's interval as (.71, .89) would also have been more plausible.

Hope this Helps!!!

You might be interested in
By the end of wrestling season, Mighty Max had lost seven pounds and now weighs 128 pounds. What was the percent decrease from h
Natali5045456 [20]
128+7=135
135=100%
10%=13.5
1%=1.35
13.5-(3×1.35)=9.45
I believe that 9.45% is the answer
5 0
3 years ago
Read 2 more answers
A large totem pole near Kalama, Washington, is 100 feet tall. On a particular day at noon it casts a 219-foot shadow. What is th
zhenek [66]

Answer: Angle of elevation of sun at that time is 24.51° .

Step-by-step explanation:

Since we have given that

Height of a large totem pole near Kalama, Washington = 100 feet

Length of a shadow at noon = 219 foot

We need to find the angle of elevation of sun at that time .

As  we know the formula for "Tangent ":

\tan\theta=\frac{AB}{BC}\\\\\tan\theta=\frac{100}{219}\\\\\tan\theta=0.456\\\\\theta=\tan^{-1}(0.456)\\\\\theta=24.51\textdegree

Hence, Angle of elevation of sun at that time is 24.51° .

7 0
3 years ago
Simplifies the expression 6y4+3y4
Anarel [89]
3y i'm not sure if thats right but thats what i got hope this helps
8 0
3 years ago
Darla sees a duck and a fish at a pond. The duck is 2 1/2 feet above the surface of the pond. The fish is 1 3/8 feet below the s
iris [78.8K]

Answer: 3 7/8 feet

Step-by-step explanation:

From the question, we are informed that Darla sees a duck and a fish at a pond and that the duck is 2 1/2 feet above the surface of the pond while the fish is 1 3/8 feet below the surface of the pond.

The distance, in feet, between the duck and the fish will be calculated as:

= 2 1/2 - (-1 3/8)

= 2 1/2 + 1 3/8

= 2 4/8 + 1 3/8

= 3 7/8 feet

The distance, in feet, between the duck and the fish is 3 7/8 feet

5 0
3 years ago
What is this pleAse? Im dumb asfk
erma4kov [3.2K]

Answer: A the mean of plot b is greater than plot a

plot a=7 and plot b= 11

Step-by-step explanation: when solving the mean you're adding all the numbers and then divide the total by the amount of numbers there are so add all the numbers within the lines on the plot

3 0
3 years ago
Other questions:
  • 75% of 124 is what number a ?
    12·2 answers
  • Find the volume of the largest right circular cone that can be inscribed in a sphere of radius 8?
    9·1 answer
  • Is my answer correct??
    15·1 answer
  • A chef is planning for a large banquet thinks that 2 out of every 5 dinner guests will order his soup appetizer. He expects 800
    13·1 answer
  • Answer please im begging you QwQ
    12·1 answer
  • David rolls a die and spins the spinner.
    9·1 answer
  • When adding or subtracting with scientific notation,why is it important to have the same power of 10?
    9·1 answer
  • Ariana borrows $200 on a 6-year loan.She is charged 5% simple interest per year.How much interest is she charged for 6 years?Wha
    14·1 answer
  • Find the missing dimension of the cylinder. Round your answer to the nearest whole number.
    5·1 answer
  • From his house, Tom rides his bike 5 kilometers east to the store. He then rides his bike 2 kilometers west to his friends house
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!