Mathematics

Fewer young people are driving. In year A, 67.9% of people under 20 years old who were eligible had a driver's license. Twenty years later in year B that percentage had dropped to 47.7%. Suppose these results are based on a random sample of 1,800 people under 20 years old who were eligible to have a driver's license in year A and again in year B.a. At 95% confidence, what is the margin of error and the interval estimate of the number of nineteen year old drivers in year A?b. At 95% confidence, what tis the margin of error and the interval estimate of the number of nineteen year old drivers in year B?c. Is the margin of error the same in parts (a) and (b)?
1 Answer
Estimate by rounding the largest number to hundreds and then multiplying.691 x 4 is approximately
2 Answers
Find the sample space for the experiment.Two county supervisors are selected from five supervisors, A, B, C, D and E, to study a recycling plan.
1 Answer
The increasing annual cost (including tuition, room, board, books, and fees) to attend college has been widely discussed (Time.com). The following random samples show the annual cost of attending private and public colleges. Data are in thousands of dollars.Private Colleges53.8 42.2 44.0 34.3 44.031.6 45.8 38.8 50.5 42.0Public Colleges20.3 22.0 28.2 15.6 24.1 28.522.8 25.8 18.5 25.6 14.4 21.8(a)Compute the sample mean (in thousand dollars) and sample standard deviation (in thousand dollars) for private colleges. (Round the standard deviation to two decimal places.)sample mean $ thousand sample standard deviation $ thousandCompute the sample mean (in thousand dollars) and sample standard deviation (in thousand dollars) for public colleges. (Round the standard deviation to two decimal places.)sample mean $ thousand sample standard deviation $ thousand
1 Answer
Which statement describes the graph of f(x) = x - 6x + 9 ?a line with an x-intercept of (-3, 0)a parabola with an x-intercept of (-3, 0)a line with an x-intercept of (3, 0)a parabola with an x-intercept of (3, 0)
1 Answer
[tex]\lim_{x\to \infty} \frac{\sqrt{9x^{2} +x+1} -\sqrt{4x^{2} +2x+1} }{x+1}[/tex]
1 Answer
Please solve for me!!During a trip , Jonathan had driven a total of 75 miles by 6:20 PM and a total of 85 miles by 6:40 Pm. He drove at the same rate for the entire trip. At what time had he driven a total of 140 miles?
2 Answers
buzz makes 75% of her free throws.If she whats to set the record of making 48 free throws in 5 minutes,how many free throws does she have to make?
2 Answers
5. A hummingbird feeder holds 2/3 of a cup of hummingbird solution. A bottle of solution will fill the feeder 8 times. How much hummingbird solution is in the bottle.
1 Answer
There are 100 bags each with 100 coins, but only one of these bags has gold coins in it. The gold coin has weight of 1.01 grams and the other coins has weight of 1 gram. We are given a digital scale, but we can only use it once. How can we identify the bag of gold coins?
1 Answer
Please answer this question.
2 Answers
Let M be the midpoint of side \overline{AB} of \triangle ABC. Angle bisector \overline{AD} of \angle CAB and the perpendicular bisector of side \overline{AB} meet at X. If AB = 40 and MX = 9, then how far is X from line {AC}?
1 Answer
The computers of nine engineers at a certain company are to be replaced. Four of the engineers have selected laptops and the other 5 have selected desktops. Suppose that four computers are randomly selected. (a) How many different ways are there to select four of the nine computers to be set up? (b) What is the probability that exactly three of the selected computers are desktops?(c) What is the probability that at least three desktops are selected?
1 Answer
lines AD and BE intersect at point C, as shown. create an expression that represents the measure of the angle DCE in terms if X part 2 of question: using your expression, solve for the missing value of X if DCE was 120 degrees.
1 Answer
To determine whether using a cell phone while driving in Louisiana increases the risk of an accident, a researcher examines accident reports to obtain data about the number of accidents in which a driver was talking on a cell phone. a. Is this a randomized experiment or an observational study? b. What is the population being studied here? c. Is the number of accidents where the driver was using a cell phone a qualitative or quantitative variable? d. Is the number of accidents where the driver was using a cell phone an ordinal, nominal, continuous, or discrete variable? e. What kind of sample is taken if the researcher only examines accident reports in the parish in which he lives?
2 Answers
What do you know about two different integers that are opposites?
2 Answers
What is the answer to 13d+25=8d
2 Answers
A student and a pet run straight towards each other at constant speed, starting with a separation of 30 m. They meet somewhere in between. Draw a picture at the beginning and another at the end, and establish a coordinate system. Give names to important quantities.
1 Answer
Suppose that a color digital photo has 512 pixels per row and 512 pixels per column, and that each pixel requires two bytes of storage. How many such pictures could you have in your camera if the camera had 6 GB of storage available
2 Answers
PLEASE HELP ME ASAP IT"S VERY URGENT WILL MARK THE BRAINLESTThe interior angles formed by the sides of a quadrilateral have measures that sum to 360.What is the value of x?Enter your answer in the box.x =
1 Answer
Jenny had $17 more than Susan, and together they had enough money to buy a game for $93 and to have a pizza for $6. How much money did Susan have?
2 Answers
Suppose Ellie starts making a lamb stew using a 6.5-quart pot. She decides to make a bigger stew. She pours everything into a pot that is 40 percent bigger. How big is the bigger pot?
1 Answer
question for class 4
1 Answer
To celebrate its grand opening a store is giving customers gift certificates which customer is the first to get two gift certificates every 8th gets a $50 gift certificate and every 6th person gets a $10 gift certificate
2 Answers