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What is the sign of − x − y −y −x start fraction, minus, x, divided by, minus, y, end fraction when x > 0 x>0x, is greater than, 0 and y > 0 y>0y, is greater than, 0? Choose 1 answer: Choose 1 answer: (Choice A) A Positive (Choice B) B Negative (Choice C) C Zero
General
6 months ago
What is the perimeter of a polygon with vertices at (-2,1) (-2,7) (1,11) (4,7) and (4,1)
General
6 months ago
Assume that females have pulse rates that are normally distributed with a mean of 74.0 beats per minute and a standard deviation of 12.5 beats per minutes. If 16 adult female is randomly selected, find the probability that her pulse rate is less than 80 beats per minute.
General
6 months ago
Solve for x. Enter your answer in interval notation using grouping symbols x^2+2x<15
General
6 months ago
A bag contains 1 red, 1 yellow, 1 blue, and 1 green marble. What is the probability of choosing a green marble, not replacing it, andthen choosing a red marble?t
General
6 months ago
The ratio of total students in Mrs.Murrays class to students in the class who have an older brother is 3 to 1. The answer is 1:2. What is the question
General
6 months ago
What is the radius of a circle in which a 30° arc is 2inches long?24 inchesO 12 incheso 213 inches
General
6 months ago
What part of the circumference is an arc whose measure is 30?01/12o 1/101/81/6
General
6 months ago
Adam has 16.45 kg of flour, and the uses 6.4 to make hot cross buns. The remaining flour is exactly enough to make 15 batches of scones. How much flour, in kg, will be in each batch of scones?
General
6 months ago
Many ground level plants in tropical rainforests have adapted to the shade of the forest canopy. These plants tend to function well as house plants since they require minimal sunlight. A botanist is interested in "domesticating" a particular plant found in the Amazon rainforest. The botanist wants to estimate the true proportion of this species of plant that will survive inside. Assuming an appropriate sample can be obtained, which confidence interval would be most appropriate for this task? A. One sample z-confidence interval, B. One sample t-confidence interval, C. Paired-samples t-confidence interval, D. Independent samples t-confidence interval, E. Confidence interval for one proportion, or Confidence interval for two proportions
General
6 months ago
A sample of a given size is used to construct a 95% confidence interval for the population mean with a known population standard deviation. If a bigger sample had been used instead, then the 95% confidence interval would have been ________ and the probability of making an error would have been ________.
General
6 months ago
A recent study was conducted to determine the curing efficiency (time to harden) of dental composites (resins for the restoration of damaged teeth) using two different types of lights. Independent random samples of lights were obtained and a certain composite was cured for 40 seconds. The depth of each cure (in mm) was measured using a penetrometer. The summary statistics for the Halogen light were n_1 = 10, x_1 = 5.35, and s_1 = 0.7. The summary statistics for the LuxOMax light were n_2 = 10, x_2 = 3.90, and s_2 = 0.8. Assume the underlying populations are normal, with equal variances. a. The maker of the Halogen light claims that they produce a larger cure depth after 40 seconds than LuxOMax lights. Is there any evidence to support this claim? Use alpha = 0.01. b. Construct a 99% confidence interval for the difference in population mean cure depths.
General
6 months ago
On a recent day, 8 euros were worth $9 and 24 euros were worth 27.
General
6 months ago
How much money should be deposited today in an account that earns 7% compounded semiannually so that it will accumulate to $11,000 in three years?The amount of money that should be deposited is $ N(Round up to the nearest cent.)
General
6 months ago
The random variable X is normally distributed with mean 5 and standard deviation 25. The random variable Y is defined by Y = 2 + 4X. What are the mean and the standard deviation of Y ? The mean is 20 and the standard deviation is 102. A) The mean is 20 and the standard deviation is 50. B) The mean is 22 and the standard deviation is 102. C) The mean is 22 and the standard deviation is 100. D) The mean is 22 and the standard deviation is 50.
General
6 months ago
A box (with no top) is to be constructed from a piece of cardboard of sides A and B by cutting out squares of length h from the corners and folding up the sides. Find the value of h that maximizes the volume of the box ifA = 7 and B = 12
General
6 months ago
Consider a rectangle that is inscribed with its base on the x-axis and its upper corners on the parabola y=C−x2, with C>0. What are the width and height that maximize the area of this rectangle? What is that maximal area?
General
6 months ago
slader the internal revenue service claims it takes an average of 3.7 hours to complete a 1040 tax form, assuming th4e time to complete the form is normally distributed witha standard devait of the 30 minutes:a. What percent of people would you expect to complete the form in less than 5 hours?b. What time interval would you expect to include the middle 50 % of the tax filers?
General
6 months ago
Police estimate that 84% of drivers wear their seatbelts. They set up a safety roadblock, stopping cars to check for seatbelt use. If they stop 140 cars, what is the probability they find at least 27 drivers not wearing their seatbelts? Use a Normal approximation.
General
6 months ago
The mean annual incomes of certified welders are normally distributed with the mean of $50,000 and a population standard deviation of $2,000. The ship building association wishes to find out whether their welders earn more or less than $50,000 annually. A sample of 100 welders is taken and the mean annual income of the sample is $50,350. If the level of significance is 0.10, what conclusion should be drawn?A. Do not reject the null hypothesis as the test statistic is less than the critical value of z. B. Do not reject the null hypothesis as the test statistic is less than the critical value of t. C. Reject the null hypothesis as the test statistic is greater than the critical value of t. D. Reject the null hypothesis as the test statistic is greater than the critical value of z.
General
6 months ago
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