professor asked her students whether or not they were registered to vote. In a sample of 50 of her students (randomly sampled from her 700 students)‚ 35 said they were registered to vote. 1. Find a 95% confidence interval for the true proportion of the professor’s students who were registered to vote. (Make sure to check any necessary conditions and to state a conclusion in the context of the problem.) We have a random sample of less than 10% of the professor’s students‚ with 35 expected successes (registered)
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equilibrium and the formation of the equilibrium constant of the iron thiocyanate complex. In order to do so‚ the use of a spectrophotometer was incorporated into the experiment. In order to obtain an accurate end result‚ the absorbance of five various samples was used. In order to determine the formation equilibrium‚ the constant obtained from Beer’s Law was factored into the calculation. The equation for Beer’s Law is A=bbc. It is important to note that Beer’s Law states that the concentration of
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Here is the report about Par‚ Inc.‚ is a major manufacturer of golf equipment test whether the new ball drive longer distance than the current model. To compare the driving distances for the two balls‚ 40 simple tests both of new and current models were subjected to distance tests. According to the data‚ we got the information we need for a hypothesis test as follow: | Current | New | Means | 269.42 | 266.67 | Count | 40 | 40 | Standard Deviation | 8.09 | 9.79
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standard deviation was 1.84 µg/mLi. a) Construct a 95% confidence interval for the population mean. b) Interpret in words your confidence interval found above. c) Estimate how many cows should be used in the study for the standard error of the sample mean to be smaller than 0.2 µ g/mLi? caffeine 28 26 11 1 -3 0 14 -4 -2 -4 -4 14 18 16 2 8 2 2. Researchers studied the short-term effect that caffeine has on heart rate. A group of twenty volunteers
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the packaging process of M & M candies for a 1.69oz bag. This process is achieved by way of using random sampling to gather data on the number of colored M&M candies (blue‚ orange‚ green‚ yellow‚ red‚ brown‚) as well as testing the sample proportion / sample mean‚ and constructing a 95% confidence interval. This report should provide a better understanding as to the methods used behind packing M&M candies. * PROJECT PART I: SAMPLING METHOD The sampling method is the scientific procedure
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switching to a new brand of brake shoes. To test the shoes‚ the manufacturer submits the shoes to a heat test. The higher the failure temperature‚ the better the shoe. Past experience has shown that heat failure temperature is normally distributed. A sample of five shoes failed at the following temperatures: 300‚ 310‚ 280‚ 350 and 260F. If the old shoes‚ which are considered reliable fail at an average temperature of 290F‚ should the company make the switch? Explain your answer. Using the t distribution
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CHAPTER ONE Background and Rationale of the Study 1.1 Background Cheating on exams has become a popular phenomenon all over the world regardless of the levels of development. For instance‚ Baerthlein (2008)‚ from Germany‚ described that over the past decade‚ cheating has become more and more common as an act of academic dishonesty. Referring to the latest statistics she expressed her concern on the alarming rate as more than two thirds of high school students admitted cheating
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1. Abstract The research area is classroom management‚ and specifically dealing with student’s behavior problems in a real classroom situation. It is universally recognized that the teacher is the key person in an education system and a well-managed classroom can provide an exciting and dynamic learning experience for everyone involved. The main objective of the research is to identify approaches for managing student behavior in order to apply valuable ways to achieve effective and positive classroom
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can still wear men’s shoes‚ but the size they are accustomed to will be labeled differently in the men’s sizes. Although the shoe size is related to the length of your foot‚ the sizes do not follow a direct formula. Subtract 1 1/2 from your size‚ if you are a size 6. Therefore‚ your equivalent men’s size would be a 4 1/2. Above is a dot graph showing the female comparison if she was to convert to a male shoe by length. It is a difference in length by a size and a half. This decision by Nyke is
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ensure that Metalcraft is providing the automotive suppliers with the zero-defect parts they require Weaknesses: * Metalcraft received one million parts daily from 200 suppliers. The high volume could lead to quality engineers only using small sample sizes for different types of parts causing them to miss more faults * Quality problems due to supplier’s production process or during transit were discovered only on arrival for many parts. This causes more logistical and delivery problems since
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