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Background: Based on the National Center of Health Statistics, the proportion of babies born at low birth weight (below 2,500 grams) in the United States is roughly .078, or 7.8% (based on all the births in the United States in the year 2002). A study was done in order to check whether pregnant women exposed to second hand smoke increases the risk of low birth weight. In other words, the researchers wanted to check whether the proportion of babies born at low birth weight among women who were exposed to second hand smoke during their pregnancy is higher than the proportion in the general population. The researchers followed a sample of 400 women who had been exposed regularly to second hand smoke during their pregnancy and recorded the birth weight of the newborns. Based on the data, the p-value was found to be .119.1.Based on the p-value, what is your conclusion (use .05 significance level)?
General
2 months ago
Prehistoric cave paintings were discovered in a cave in France. The paint contained 10 %10% of the original carbon-14. Use the exponential decay model for carbon-14, Upper A equals Upper A 0 e Superscript negative 0.000121 t=A0e−0.000121t, to estimate the age of the paintings.
General
2 months ago
After drawing the line y = 2x − 1 and marking the point A = (−2, 7), Kendall is trying to decide which point on the line is closest to A. The point P = (3, 5) looks promising. To check that P really is the point on y = 2x − 1 that is closest to A, what should Kendall do? Is P closest to A?
General
2 months ago
Calamity Jane goes to the bank to make a withdrawal, and is equally likely to find 0 or 1 customers ahead of her. The service time of the customer ahead, if present, is exponentially distributed with parameter λ. What is the CDF of Jane’s waiting time?
General
2 months ago
Natalie is skiing along a circular ski trail that has a radius of 2.6 km. She starts at the 3-o'clock position and travels in the CCW direction. Natalie stops skiing when she is 0.942 km to the right and 2.423 km above the center of the ski trail. Imagine an angle with its vertex at the center of the circular ski trail that subtends Natalie's path. a. How many radians has the angle swept out since Natalie started skiing? ______radiansb. How many km has Natalie skied since she started skiing? _________km
General
2 months ago
A simple random sample of 1200 adult Americans is selected, and each person is asked the following question: "In light of the huge national deficit, should the government at this time spend additional money to establish a national system of health insurance?" Only 39% of those responding answered "Yes." This survey ____. a. is reasonable accurate since it used a large simple random sample. b. needs to be larger since only about 24 people were drawn from each state. c. probably understates the percent of people who favor a system of national health insurance. d. is very inaccurate but neither understates nor overstates the percent of people who favor a system of national health insurance. Because simple random sampling was used, it is unbiased. e. probably overstates the percent of people who favor a system of national health insurance.
General
2 months ago
A line is parameterized by x=2+6???? and y=4+3????. (a) Which of the following points are on the section of the line obtained by restricting ???? to nonnegative numbers (for each, enter Y if the point is on the section, and N if not)? (−28,−11) : (8,7) : (26,16) : Then, give one more point that is on the section of the line obtained by this restriction: (b) What are the endpoints of the line segment obtained by restricting ???? to −2≤????≤1? left endpoint : right endpoint : (c) How should ???? be restricted to give the part of the line above the x-axis (give your answer as an interval for ????, for example, (3,8) or [-2,Inf))? ???? must be in :
General
2 months ago
The rate (in mg carbon/m3/h) at which photosynthesis takes place for a species of phytoplankton is modeled by the function P = 120I I2 + I + 1 where I is the light intensity (measured in thousands of foot-candles). For what light intensity is P a maximum?
General
2 months ago
Two pipes are connected to the same tank. When working together., they can fill the tank in 10hrs. The larger pipe, working alone, can fill the tank in 15 hrs less time than the smaller one. How long would the smaller one take, working alone, to fill the tank
General
2 months ago
calcular lo que costará sembrar césped en un jardín de forma triangular de base 25 m y de altura 15m si cada metro cuadrado de césped cuesta $20 dólares
General
2 months ago
Which image that would portray the rotation of the given preimage and the rotation arrow.Pre-image (1st picture shown):Image (the following 4 pictures are the options):
General
2 months ago
Marge orders the following items and would like to leave a 20 percent tip based on her bill. There is no tax on her meal. What is the total cost of her dinner including gratuity? Item Amount Soup $3.75 Shrimp scampi $15.00 Iced tea $2.60 Dessert $4.25.
General
2 months ago
PLZZZZZZ HELPPPPSolve the system of equations using the substitution method. {2x+8y=4x=−3y+5 Enter your answers in the boxes.
General
2 months ago
Consider U = {x|x is a positive integer greater than 1}.Which is an empty set?{x|x ∈ U and 1/2 x is prime}{x|x ∈ U and 2x is prime}{x|x ∈ U and 1/2 can be written as a fraction}{x|x ∈ U and 2x can be written as a fraction}
General
2 months ago
Find the vertex of the given function.f(x) = l x-5 l + 10The vertex is at (___, ___)
General
2 months ago
Which absolute value function has a graph that is wider than the parent function when graphed represents the parent function f(x)=|x| reflected over the x-axis and translated 1 unit to the rightA. F(x) = -|x|+1B. F(x) = -|x-1|C. F(x) =|-x|+1D. F(x) =|-x-1|
General
2 months ago
Which equation is the inverse of y = 9x^2 - 4?
General
2 months ago
what is the sum of the arithmetic series 18 t=1 (3t-4)a. 234b. 441c. 25.5d. 49
General
2 months ago
Which is the standard form of the equation of the parabola that has a vertex of (–4, –6) and a directrix of y = 3?
General
2 months ago
The sum of four consecutive odd integers is –72. Write an equation to model this situation, and find the values of the four integers.
General
2 months ago
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