Suppose 8 of 20 students in a grade-school class develop influenza, whereas 20% of grade-school students nationwide develop influenza.USE SALT(a) Is there evidence of an excessive number of cases in the class? That is, what is the probability of obtaining at least 3 cases in this class if the nationwide rate holds true? (Round your answer to four decimal places.)(b) What is the expected number of students in the class who will develop influenza?

Answered: Image /qna-images/answer/1200f271-e5f2-4dac-9925-c0f1454881a8.jpg

Answered: (a) Is there evidence of an excessive…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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I need help with this problem! Suppose that it snows in Greenland an average of once every 26 days, and when it does, glaciers have a 28% chance of growing. When it does not snow in Greenland, glaciers have only a 6% chance of growing. What is the probability that it is snowing in Greenland when glaciers are growing? (Round your answer to four decimal places.)
The probability that a patient recovers from a stomach disease is 0.7. Suppose 20 people are known to have contracted this disease. (Round your answers to three decimal places.) (a) What is the probability that exactly 13 recover? (b) What is the probability that at least 10 recover? (c) What is the probability that at least 13 but not more than 17 recover?
Do you think global warming will have an impact on you during your lifetime? A poll of 1,000 adults asked this question. Consider the responses by age groups shown below. Age Response 18-29 30+ Yes 134 293 No 131 432 Unsure 2 8 (a) What is the probability that a respondent 18-29 years of age thinks that global warming will not pose a serious threat during his/her lifetime? (Round your answer to four decimal places.) (b) What is the probability that a respondent 30+ years of age thinks that global warming will not pose a serious threat during his/her lifetime? (Round your answer to four decimal places.) (c) For a randomly selected respondent, what is the probability that a respondent answers yes? (d) Based on the survey results, does there appear to be a difference between ages 18-29 and 30+ regarding concern over global warming? O It appears that older respondents and younger respondents are mostly unsure about global warming being a threat in their lifetime. O It appears that older…
interested in versus left- handedness and the IQ scores 3. A psychologist right-handedness collected the following data from a random of 2000 high school students. What is the probability that a student has a high IQ given that she is left-handed? High IQ Normal IQ Right-handed 190 1710 Left-handed 10 90
In a recent pollI, a random sample of adults in some country (18 years and older) was asked, "When you see an ad emphasizing that a product is "Made in our country," are you more likely to buy it, less likely to buy it, or neither more nor less likely to buy it?" The results of the survey, by age group, are presented in the following contingency table. Complete parts (a) through (c). Purchase likelihood 18-34 35-44 45-54 55 + Total More likely 223 300 392 402 1317 Less likely 29 6 25 14 74 Neither more nor less likely 287 207 156 116 766 Total 539 513 573 532 2157
You conjecture that the percentage of brown-eyed people in a large population is 15%. To test your conjecture, you get 20 random volunteers and check their eye color. Let B be the number of brown-eyed people in the sample. For applicable questions fill in the BLANK a. The random variable B has a distribution is (BLANK) with parameters (BLANK) b. The expected value of B is (BLANK) c. Calculate probability that B is greater than or equal to 8. d. Suppose you and 8 brown-eyed people in your random sample of 20. What do you think about your conjecture that 15% of the population is brown-eyed? Explain your reasoning.
True or False: If a P-value is 0.01, then the probability that Ho will be rejected is 0.01 or 1%. O True O False
Based on historical data, your manager believes that 36% of the company's orders come from first-time customers. A random sample of 74 orders will be used to estimate the proportion of first-time-customers What is the probability that the sample proportion is between 0.26 and 0.47? (Enter your answer as a number accurate to 4 decimal places.) Submit Question
I need help with this very soon please. If 30% of all pipework failures in the chemical plant were caused by operator error, then the probability that exactly 7 of the failures in the sample are due to operator error would be_______. Since the probability is (greater or less) than 0.05, this ( is or is not) a rare event. The 30% figure (seems or does not seem) reasonable. (Round to four decimal places)
A new design for the braking system on a certain type of car has been proposed. For the current system, the true average braking distance at 40 mph under specified conditions is known to be 120 ft. It is proposed that the new design be implemented only if sample data strongly indicates a reduction in true average braking distance for the new design. (a) Define the parameter of interest. = true proportion of cars whose braking distances did not reduce µ = true average braking distance for the new design = true proportion of cars whose braking distances reduced µ = true average braking distance for the old design State the relevant hypotheses. O Ho: µ = 120 Н: и # 120 Ho: H = 120 H: u > 120 O Ho: p = 120 H: p 117.2 X < 117.2
Based on historical data, your manager believes that 33% of the company's orders come from first-time customers. A random sample of 207 orders will be used to estimate the proportion of first-time-customers. What is the probability that the sample proportion is between 0.32 and 0.5? Note: You should carefully round any z-values you calculate to 4 decimal places to match wamap's approach and calculations. Answer = (Enter your answer as a number accurate to 4 decimal places.)
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