distribution with a mean of 2.5 minutes. What is the probability that the service time is between 2 and 4 minutes? (A) 0.2488 (B) 0.4493 (C) 0.2019 (D) 0.2474 (E) 0.1170 16. A random variable X follows an exponential distribution with a standard deviation of 0.5. What is P(X ≥ 0.5)? (A) 0.6321 (B) 0.5 (C) 0.3679 (D) 0.7788 (E) 0.2212 4 17. You are given the following summary statistics for a sample of 50 observations: Mean = 37 25th percentile = 36 Minimum = 24 Median = 44 Range = 28
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school students on homework and assignment problems in Math‚ Sciences‚ Finance‚ Marketing‚ Statistics‚ Economics‚ Engineering‚ and many other subjects. Suppose there are three risky assets‚ A‚ B and C with the following expected returns‚ standard deviations of returns and correlation coefficients. E (rA)= 4% E (rB)=5% E (rC) =15% S.DEVA=5% S.DEVB=7% S.DEVC=10% A‚ B=0.7 A‚ C=-0.2 B‚C=0.3 QUESTION 1: Solving for the Global Minimum Variance Portfolio Consider a world where there are no risk free
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the extent to which the observations are scattered. Objectives: * To use summary statistics to describe collection of data. * To use the mean‚ median and mode to describe how data “bunch up” * To use the range‚ variance and standard deviation to describe how data “spread out”. MEASURES OF CENTRL TENDENCY Measures of central tendency include three important tools – mean (average)‚ median and mode. Mean The arithmetic mean is the most common measure of central tendency. For a data
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explain this? 2. Cocaine addicts need cocaine to feel any pleasure‚ so perhaps giving them an antidepressant drug will help. A three-year study with 72 chronic cocaine users compared an antidepressant drug called desipramine against lithium (a standard drug to treat cocaine addiction)‚ and of course a placebo as well. The subjects were randomly assigned to receive each treatment. Here are the results: | | Cocaine Relapse? | Group | Treatment | Yes | No | 1 | Desipramine | 10 | 14
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simplified form of X2 – y2 / ( x – y)-2? F –( x – y)3(y + x) G ( y – x2)(x – y2) H ( y – x)4 J ( x + y)( x – y)3 SPI 3103.5.4 A set of data is normally distributed with a standard deviation of 9. If the value 101 is two standard deviations above the mean‚ what is the mean? F 83 G 95 H 119 J 92 SPI 3103.2.1 If z= 4 – 3i‚ what is z? A 1 B C 5 D 25 SPI 3103.2.2 Simplify 3i(5i) A 15i
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Name Assignment QNT/561 Date Descriptive Statistics Sales (in USD) The distribution is normally distributed. Central Tendency: Mean = 42.84 dollars. Dispersion: Standard deviation = 9.073 dollars. Count: 100 Min/Max: Min is $23.00; Max is $64.00 Confidence Interval (alpha = 0.05): $41.06 to $44.62 The histogram is present in Appendix A; the descriptive statistics are present in Appendix B. Age The distribution is not normally distributed. Central Tendency: Median = 35 years Dispersion:
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Chapter I Background of the Study A school library is a library within a school where students‚ staff‚ and often‚ parents of a public (state) or private (fee paying) school have access to a variety of resources. The goal of the school library is to ensure that all members of the school community have equitable access "to books and reading‚ to information‚ and to information
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1. Assume 20% of all email is spam. A large Internet provider plans on conducting a survey of 900 emails to see what percentage are spam. a. What is the probability they will get a proportion greater than 0.1836? b. If they get a sample proportion over 24% they are going to shut down their email server. What is the probability this will happen? 2. A survey is done to estimate the proportion of U.S. adults who think that cell phone use while driving should be illegal. In the survey‚ 54%
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University of Phoenix Material Time to Practice – Week One Part A Some questions in Part A require that you access data from Statistics for People Who (Think They) Hate Statistics. This data is available on the student website under the Student Test Resources link. 1. By hand‚ compute the mean‚ median‚ and mode for the following set of 40 reading scores: SUMMARY 31 32 43 42 24 34 25 44 23 43 24 36 25 41 23 28 14 21 24 17 25 23 44 21 13 26 23 32 12 26
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parameter values involved in a t-test. The t-test is more sensitive to minor differences between sample and population. With the t-test one can be confident of the normality of the data. The t-test requires no <known> parameter standard error of the mean. Points Received: 0 of 1 Comments: Question 2. Question : If a certifying agency raises the requirements for real estate agents‚ what sort of decision error is the agency protecting against? Student Answer: Type
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