A psychology quiz consists of 20 multiple chice questions with five possible answers for each question. A student, say John, is totally unprepared so randomly guesses the answer to each question. This means that John has a probability of1/5 = .20 of getting any particular problem correct. Let X equal the number of questions out of the 20 questions that John gets correct. Do the calculations below using R.--- LIIE /ULI pe.f. What is the expected value of X? 4g. What is the variance of X?3.2h. What is the standard deviation of X? 1.788854

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Answered: A psychology quiz consists of 20…

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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The literacy rate for a nation measures the proportion of people age 15 and over that can read and write. The literacy rate in Afghanistan is 28.1%. Suppose you choose 15 people in Afghanistan at random. Let X = the number of people who are literate. Find the probability that is four people are literate. 0.2259 0.2246 O 0.1927 None of the choices
Which of the following are true when considering the probability of spinning a multiple of 5 on an equal section spinner with numbers 1-20? which apply. a. P(A) = ⅕ b. n(S) = 20 c. n(A) = 4 d. n(A’) = 16 e. P(A) = 20% f. A = {5,10,15,20} g. P(A) = 4/20 h. P(A’) = ⅘ i. P(A’) = 0.8 j. S is all numbers between 1 and 20 inclusive
Classic Probability Kevin was a product tester at Texas Instruments. He was dropping calculators from a height of 5 feet on to a concrete surface. He found that out of 30 trials 6 of them were broken. Based on these initial trials what is the probability that the next calculator he drops will not break? OA. O A. : Theoretical Probability O B. Empirical Probability O C. Subjective Probability D. ; Dependent Probability
The probabilities of all the values of a random variableX must: OA. average to a small and negative number. OB. add up to 1. OC. average to 0. D. none of the above,
is the following is an example of an empirical probability or a theoretical probability? Joe tosses a coin 10 times and gets 4 heads. He concludes that the probability of getting a head is 4/10=0.4 or 40%. A. Empirical B. Theoretical
Need question d and e answers
A coin is tossed 4 times and gives four heads in a row. You say “I guess that the fifth toss will result into a head with a probability of 1.”
Let X = number of siblings. Use the following table to answer questions 3 and 4: x (p)x 0 2/40 1 5/40 2 0 3 14/40 4 7/40 5 4/40 3. Find the probability that a person has two siblings.a. 8/40b. 8c. 2d. 6/404. Find the expected number of siblings a person has.a. 2.78b. 15c. 3.13d. 1.0
The accompanying table shows the results from a test for a certain disease. Find the probability of selecting a subject with a negative test result, given that the subject has the disease. What would be an unfavorable consequence of this error? The individual actually O had the disease Yes No Positive 334 Negative 13 1176 EEE .E The probability is (Round to three decimal places as needed.) What would be an unfavorable consequence of this error? A. The test would be shown to be not effective. OB. The subject would experience needless stress and additional testing. Gradebo O C. The subject would not receive treatment and could spread the disease. Sco O D. The test would be shown to be not reliable. see scor
If the probability distribution for the random variable X is given in the table, what is the expected value of X? xi −1 2 4 pi .4 .5 .1
Find the value of X (Left Tailed Probability of 0.5) for v1 = 10 and v2 = 20 degrees of freedom.
Let's calculate the probability of finding someone special. Using a form of Fermi's Paradox (the difference between having limited or no choices to having high amount of choices). Let's calculate your probability using the following data. Multiply the number and all percentages together N (subscript p): Number of people = your target population (number of people in your state). Broward County, FL is 1,953, 251 million. Dade County, FL is 2,717,251 million. Palm Beach County, FL is 1, 497,251 million. Harris County, TX is 4,731,251 million. (example: 1,374,251 x .5 x .44 x .37 x .25 x.10 x.10 = 279 people are potential special people for you) times f (subscript g) = target gender (multiply as a decimal. Example: 0.5 for either sex or 1.0 for both sexes) times f (subscripts) = single people (multiply as a decimal) About 44% of people are single at any given time. f (subscript e) = the number of people you'll run into (multiply as a decimal). Your sample size will be small if you only…

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