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Mathematics Questions and Answers February 28, 2023

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Graph x^2 + y^2 - 144 = 0, find y` by implicit differentiation, and find the slope of the graph when x=10.

Against the wind a commercial airline in South America flew 216 miles in 2 hours. With a tailwind the return trip took 1.5 hours. What was the speed of the plane in still air? What was the speed of the wind?

A physician who specializes in weight control has three different diets she recommends. As an experiment, she randomly selected 15 patients and then assigned 5 to each diet. After three weeks the following weight losses, in pounds, were noted. At the .05 significance level, can she conclude that there is a difference in the mean amount of weight

1.Find an irrational number between 5/11 and 6/11 2. Find an irrational number between 1.673 and 1.673 3. Find an irrational number between 1.67 and 1.68 Course Textbook Pirnot, T. L. (2014). Mathematics all around (5th ed.). Boston, MA: Pearson Education.

X+y=-3 x-y=5 solve the system by the addition method

DISCHARG 223.00 18.30 175000.00 7.29 45.60 7900.00 11.80 6500.00 8.10 336.00 19.10 3550.00 16.10 16000.00 706.00 16.90 1470.00 2.00 560.00 16.10 1900.00 6.10 10600.00 7500.00 31.30 15000.00 21.00 17.50 317.00 9.10 16100.00 318.20 0.30 2370.00 2.20 7000.00 6.20 950.00 0.30 170.00 0.20 33900.00 15900.00 1470.00 22.00 2200.00 11.90 1700.00 17.70

Decision Investment Motel Restaurant Theater Shortage -$7,500 $3,000 $5,000 States of Nature Gasoline Availablity Stable Supply $12,000 $7,000 $6,000 Surplus $23,000 $6,500 $4,000 Maximum Minimum $23,000 -$7,500 $7,000 $3,000 $6,000 $4,000 Maximax decision = Maximin decision = Regret Table Decision Investment Motel Restaurant Theater States of

Result Brand-name Generic Placebo Improvement 16 29 13 No change 12 20 44 Calculate the marginal frequencies and sample size. Find the expected frequency for each cell in the contingency table. Assume that the variables are independent.

Do you use probability in your profession or real life? You most likely do. For example, the chance of rain tomorrow is 27%. We hear similar probabilities in the media all the time. Evaluate and discuss how you make decisions based on the probabilities you hear in daily life. Similar probabilities could be found in other professions. Using a

What is the most replenishable natural fiber (not bamboo)? (Give apparel product example.)

Mohammed Yaaseen Gomdah MATH 203 Winter 2016 F WeBWorK assignment number Assignment 9 W14 is due : 03/23/2016 at 03:00am EDT. The (* replace with url for the course home page *) for the course contains the syllabus, grading policy and other information. This le is /conf/snippets/setHeader.pg you can use it as a model for creating les which

Eleanor scores 680 on the SAT Mathematics test. The distribution of SAT scores is symmetric and single-peaked, with mean 500 and standard deviation 100. Gerald takes the American College Testing (ACT) Mathematics test and scores 27. ACT scores follow a symmetric, single-peaked distribution- but with mean 18 and standard deviation 6. Find the

An agent for a residential real estate company in a suburb located outside of Washington,DC, has the business objective of developing more accurate estimates of the monthly rental cost for apartments. Toward that goal the agent would like to use the size of an apartment, as defined by square footage to predict the monthly rental cost. The agent

Researchers studied the mean egg length(in millimeters) for the New Zealand bird population. After randomly sampling 54eggs, they obtained a95% confidence interval of (38mm,53mm). What is the value of the e margin of error?

True or false Using the standard normal curve, the Z- score representing the 10th percentile is 1.28.

Fifteen houses rented recently in a certain county provided the data: size of the housex(in sq. ft.) and the monthly renty(in thousands of dollars). The sample data are summarized by the following information: n = 15, x= 16,560, y= 21.685, xy= 28,474.85, x 2 = 22,557,866, y 2 = 36.93, 650 x 2,400 They-intercept of the least squares regression line

show work not just answers. 20. Suppose it is known that 60% of radio listeners at a particular college are smokers. A sample of 500 students from the college is selected at random. Approximate the probability that at least 280 of these students are radio listeners. 21. A random sample of 10 university students was surveyed to help estimate the

1) Define and give the formula for relative risk. How does it differ from an odds ratio? 2) A cohort study was conducted to study the association between coffee drinkers and anxiety in a population-based sample of adults. Among 20,000 coffee drinkers, 500 developed anxiety. Among the 50,000 noncoffee drinkers, 250 cases of anxiety were observed.

Two radiologists review the same set of x-rays for signs of lung cancer. If radiologist A codes 25 as positive and 75 as negative, and radiologist B codes 32 as positive and 68 as negative, how many x-rays would we expect them to agree on, just by chance?

9. Suppose that prior to conducting a coin-flipping experiment, we suspect that the coin is fair. How many times would we have to flip the coin in order to obtain a 99% confidence interval ofwidthof at most .18 for the probability of flipping a head? a)205 b)167 c)210 d)166 e)204 f)None of the above

STAT200 FINAL EXAM A A STAT 200 instructor believes that the average quiz score is a good predictor of final exam score. A random sample of 5 students produced the following data where x is the average quiz score and y is the final exam score. x 90 50 60 100 70 y 145 150 130 180 120 STAT200 FINAL EXAM A Find an equation of the least squares

find the area of the shaded region. the graph depicts the standard normal deviation with mean =0 and standard deviation of 1. z=0.46

Many veterans who bravely served in Iraq during Operation Enduring Freedom or Operation Iraqi Freedom have developed symptoms of post-traumatic stress disorder (PTSD) or similar ailments. A large study of returning veterans showed that 52.7% of the soldiers suffered from a PTSD or similar ailment after serving in Iraq. A random sample of 200

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