Chapter 3 Standard units tell you how many standard deviations above or below average a data value is standard units = (actual value – average)/SD actual value = average + (SD x standard units). Standard units are denoted by Z. Chapter 8 Complement rule: P(A) = 1 – P(A doesn ’t happen) Multiplication rule: P(A and B both happen) = P(A) x P(B given A happened) Q. 5 random components removed one at a time from box containing 5 defective and twenty working. What is chance of selecting all defective:
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and the property owner‚ 82 Milbar Boulevard Corp.‚ had filed for bankruptcy in 1986 and 1987‚ respectively‚ EPA performed the Remedial Design and Remedial Action (RD/RA) for the site. And ICF Corporation and Ebasco Services Incorporated respectively performed the Remedial Design in the OU-1 ROD and OU-2 ROD on behalf of EPA. For the Remedial Action‚ EPA entered into an interagency agreement (IAG) with the U.S. Army Corps of Engineers (USACE) for the implementation of construction. USACE contracted with
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DataStor Case Study | | Team 1 | Case Study for DataStor Background DataStor‚ a data storage device and media manufacturer‚ produces a compact hard drive called DS1000‚ which stores 1GB of data. Their primary customer is Four-D‚ a national reseller of the drives. Four-D has rejected four shipments of drives from DataStor in the past 20 days. DataStor wants to understand why their shipments are being rejected. DataStor operates three 8-hour shifts‚ five days a week. Each shift
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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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Population and Sample Our topic is about harmful effects that can affect a student’s performance in school and daily life. Our population of interest would be college students as they are the demographic most subject to many negative influences. Our sample would be stratified because we want to compare the answers of each of the classes: freshman‚ sophomores‚ juniors‚ and seniors. As a result‚ we would be able to see what types of harmful effects each class of students are most concerned about
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1. The mean incubation time of fertilized eggs is 22 days. Suppose the incubation times are approximately normally distributed with a standard deviation of 1 day. (A) The 19th percentile for incubation times is ____ days? (round to the nearest whole number as needed (B) The incubation times that make up the middle 39% are ___ to ___ days? (round to nearest whole number‚ use ascending order) 2. As reported by a recent survey‚ the mean height of females 20 to 29 years old is 63.6 inches. If the
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Cigarette Smoking Over the years‚ researchers have been trying to connect smoking to lung cancer. They have finally come to this conclusion and are now trying to link smoking to other coronary heart diseases. Research has been done in many countries‚ and the results have shown that there was a moderate relationship to cigarette consumption and heart diseases. Through a regression‚ it has been proven that there is a link to the two factors. The U.S is also trying to cut their consumption in half
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University of Phoenix Material Week Five Quiz Terms and Definitions matching _C__ Statistics _N__ Discrete variable _ __ Statistics _S_ Continuous variable _J__ Population _ F__ Qualitative data _L__ Population parameters __R_ Quantitative data _G__ Sample __H_ Mean _B_ Bias _D Mode _O__ Representative sample _Q__ Median _P__ Experimental study _T__ Unimodal __A_ Observational study __K_ Relative frequency _I__ Double-blind study _E__ Standard deviation
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Sample Final MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Questions 1-4 The following is a set of data from a sample of size n( n=6): 1) Find the mean of the data set A) 15 B) 14 C) 10 D) 13.5 10‚ 17‚ -2‚ 10‚ 23‚ 26. 2) Find the standard deviation of the data set A) 9.33 B) 522.00 C) 104.40 D) 10.22 3) The five-number summary of the data set consists of __________‚ __________‚ __________‚ __________‚ and __________. A) -2‚ 10‚ 13.5‚
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CHAPTER 10 HYPOTHESIS TESTING MULTIPLE CHOICE QUESTIONS In the following multiple-choice questions‚ please circle the correct answer. 1. If a researcher takes a large enough sample‚ he/she will almost always obtain: a. virtually significant results b. practically significant results c. consequentially significant results d. statistically significant results ANSWER: d 2. The null and alternative hypotheses divide all possibilities into: a. two
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