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
Butoxors [25]
3 years ago
7

A researcher wishes to estimate the average blood alcohol concentration for drivers involved in fatal accidents who are found to

have positive BAC(blood alcohol concentration) values. He randomly selects records from 1100 such drivers in 2009 and determines the sample mean BAC to be 0.15 g/dL. with a standard deviation of 0.07 g/dL.?(a) A histogram of blood alcohol concentrations in fatal accidents shows that BACs are highly skewed right. Explain why a large sample size is needed to construct a confidence interval for the mean BAC of fatal crashes with a positive BAC.A.Since the distribution of blood alcohol concentrations is normally? distributed, the sample must be large so that the distribution of the sample mean will be approximately normal.B.Since the distribution of blood alcohol concentrations is not normally distributed? (highly skewed? right), the sample must be large so that the distribution of the sample mean will be approximately normal.C.Since the distribution of blood alcohol concentrations is normally? distributed, the sample mean will be approximately normal regardless of sample size.D.Since the distribution of blood alcohol concentrations is not normally distributed? (highly skewed? right), the sample mean will be approximately normal regardless of sample size.?(b) In? 2009, there were approximately? 25,000 fatal crashes in which the driver had a positive BAC. Explain why? this, along with the fact that the data were obtained using a simple random? sample, satisfies the requirements for constructing a confidence interval.A. The sample size is greater than? 10% of the population.B. The sample size is greater than? 5% of the population.C.The sample size is less than? 10% of the population.D. The sample size is less than? 5% of the population.?(c) Determine and interpret a? 90% confidence interval for the mean BAC in fatal crashes in which the driver had a positive BAC.The? 90% confidence interval for the mean BAC is? (Round to the nearest thousandth as? needed.)Interpret a? 90% confidence interval for the mean BAC. Choose the correct answer below.A. The researcher is? 10% confident that the population mean BAC is in the confidence interval for drivers involved in fatal accidents who have a positive BAC value.B. There is a? 90% probability that the population mean BAC is in the confidence interval for drivers involved in fatal accidents who have a positive BAC value.C. The researcher is? 90% confident that the population mean BAC is not in the confidence interval for drivers involved in fatal accidents who have a positive BAC value.D. The researcher is? 90% confident that the population mean BAC is in the confidence interval for drivers involved in fatal accidents who have a positive BAC value.?(d) All areas of the country use a BAC of 0.080 ?g/dL as the legal intoxication level. Is it possible that the mean BAC of all drivers involved in fatal accidents who are found to have positive BAC values is less than the legal intoxication? level?A. No, it is not possible.B. ?Yes, and it is highly probable.C. Yes, but it is not likely.
Mathematics
1 answer:
Agata [3.3K]3 years ago
8 0

Answer:

(A) since the distribution of blood alcohol concentration is highly skewed right, a large sample size is necessary to ensure that the distribution of the sample mean is approximately normal.

(B) The sample size is likely less than 5% of the population

Step-by-step explanation:

You might be interested in
Which statement correctly compares functions f and g? function f function g An exponential function passes through (minus 1, 5),
slamgirl [31]

A statement correctly compares functions f and g is that: C. they have the same end behavior as x approaches -∞ but different end behavior as x approaches ∞.

<h3>What is a function?</h3>

A function can be defined as a mathematical expression that defines and represents the relationship between two or more variable, which is typically modelled as input (x-values) and output (y-values).

<h3>The types of function.</h3>

In Mathematics, there are different types of functions and these include the following;

  • Periodic function
  • Inverse function
  • Modulus function
  • Signum function
  • Piece-wise defined function.

Function g is represented by the following table and a line representing these data is plotted in the graph that is shown in the image attached below.

x          -1   0   1    2   3   4

g(x)     24  6   0  -2  

Based on the line, we can logically deduce the following points:

  • y-intercept approaches -2.43 to 24.86.
  • x-intercept approaches negative infinity (-∞) to infinity (∞).

This ultimately implies that, a statement correctly compares functions f and g is that both functions have the same end behavior as x approaches -∞ but different end behavior as x approaches ∞.

Read more on function here: brainly.com/question/9315909

#SPJ1

6 0
1 year ago
At a local department store, skirts typically cost $15. However, due to a special, the
Strike441 [17]

Answer: 20%

Step-by-step explanation:

(part / whole) * 100

(3 / 15) * 100 = 20%

4 0
3 years ago
Please help!!!!! Will give brainliest!!
valkas [14]

2.57*10^4 is 1,000,000 times more than 2.57*10^-1

Why?

4-(-1)=5 2

2.57*10^4=25700

2.57*10^-1=0.0257

and

25700

÷ 0.0257

=1000000

and 1000000=10^6

6 0
3 years ago
3 intersecting lines are shown. A line contains points E, D, A, and B. Another line intersects the line at point A and contains
GREYUIT [131]

Answer:

The one with arrows are the answers

->Line segment E B  is bisected by Line segment D F .

->A is the midpoint of Line segment F C .

Line segment F C  bisects Line segment D B.

->Line segment E B  is a segment bisector.

->FA = One-halfFC.

Line segment D A is congruent to Line segment A B .

Step-by-step explanation:

I did it on edge and got it right

5 0
3 years ago
Read 2 more answers
Ella conducted a survey to find out the amount of time high schoolers spend surfing the Internet. From the data collected, the r
Afina-wow [57]

Answer:

the answer is C

Step-by-step explanation:

The answer is C.

Because we do not have any tables graphs etc., we can only use the fact that the range is 1

The definition of range is the difference between the largest amount and the smallest amount. In equation form, it should look like this:  

Now lets move to the answer choices:

Answer A. is wrong

If everyone surfed for exactly an hour, the largest amount of time would be 1 hour and the smallest amount of time would also be 1 hour. Put this into the equation and the range would be 0 which is contradicted from the data present

Answer B. is wrong because the range is not the average, the mean is the average. We are looking for the range, not the mean so Answer B. is incorrect.

Answer C. is correct. The range is the difference between the largest and the smallest. In this answer, it tells us that the range is the difference between the greatest amount of time and the least amount of time spent surfing the Internet is 1 hour. This follows the term of "Range" and therefore, Answer C. is correct.

Answer D. is incorrect because the range does not have anything to do with quotients.(By the way, a quotient is the result of dividing a dividend with a divisor.) The range is only obtainable with subtraction, not division, so answer D. is incorrect.

please mark as brainliest. l need it to be an ace. please give me if you like it.

5 0
3 years ago
Read 2 more answers
Other questions:
  • How many different orders can be formed for a 9 member baseball team
    15·1 answer
  • 2. Huma’s father gives her $120 as her monthly allowance.
    12·2 answers
  • Stacy bought a skateboard at a local sporting goods store. The skateboard was on sale for 10% off the original price. The store
    15·1 answer
  • Is feet bigger than inches
    8·2 answers
  • Which is greater 16/12 or 9/3
    14·2 answers
  • Can you guys help?<br> Need to find x, BA, DA
    15·1 answer
  • What is the center of the circle given by the equation
    12·1 answer
  • Max wants to buy shirts that cost $8 each. He also wants to buy a pair of sneakers for $39. A. Write an inequality that represen
    8·1 answer
  • What is the measure of angle 5 if the measure of angle 2 is 37 degrees and the measure of angle 3 is 72 degrees
    15·1 answer
  • Please help I’ll give Brainiest
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!