necessary. A sample space A list of all possible outcomes of an experiment Event Sub-set of possible outcomes of an experiment. Normal Distribution Bell shaped curve symmetrical about mean; mean = mode = median 95% of data lies within 2 standard deviations of mean 2 conditions for skewness Positive skew if ( Q3 − Q2 ) − ( Q2 − Q1 ) > 0 and if Mean − Median > 0 . Negative skew if ( Q3 − Q2 ) − ( Q2 − Q1 ) < 0 and if Mean − Median < 0 . Independent Events P ( A ∩ B) = P( A) × P( B) Mutually Exclusive
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with a standard deviation of 3.6 percent (Exhibit 2). This is the only positive return compared to our proxy markets: the VFINX Index (-.4%)‚ NASDAQ 100 (-.7%)‚ and the VHGEX Index (-.1%). Along with generating the highest return‚ our portfolio had the highest risk. Compared to the 3.6 percent standard deviation of returns on our portfolio‚ the VFINX Index (1.87%)‚ the NASDAQ 100 (2.54%)‚ and the VHGEX Index (1.60%) all show less volatility (Exhibit 2 shows the standard deviations of the 4
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1. As the degrees of freedom increase‚ the t distribution approaches the b. normal distribution 2. If the margin of error in an interval estimate of μ is 4.6‚ the interval estimate equals b. [pic] 3. The t distribution is a family of similar probability distributions‚ with each individual distribution depending on a parameter known as the c. degrees of freedom 4. The probability that the interval estimation procedure will generate an interval that does
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Name___________________________________ Provide an appropriate response. 1) Two random variables are normally distributed with the same mean. One has a standard deviation of 10 while the other has a standard deviation of 15. How will the graphs of the two variables differ and how will they be alike? 2) Which is larger‚ the area under the standard normal curve between -1 and 1‚ or the area under the standard normal curve between 0 and 2? Explain your reasoning. 3) Which of the variables below do you think will be roughly
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GM533 Course Project – Case 32 Executive Summary: The purpose of this analysis is to assist the Quick Stab Collection Agency (QSCA) in determining if the amount or size of a bill collection is directly related to the number of days the bill is late. In order to support the validity of this relationship‚ a statistical analysis on the data provided will support the relationship with 95% confidence. These findings will give us a better understanding of the QSCA’s business and provide key insights
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Quantitative methods Time value of money Effective annual rate (EAR) Effective annual rate (EAR) = (1+stated annual rate/frequency‚ m) ^ m-1 Annuities Ordinary annuities: cash flow at the end of each period‚ normal one; Annuities due: cash flow at the beginning of each period‚ first payment =t0; Calculator setting: [2nd][BGN]-[2ND][SET]; same procedure for setback to END; Payment at beginning of next three years‚ N=4‚ always +1 using annuities due It is a BGN question‚ if first payment is today
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Bio 205 Lab W/8:00 Enzyme II Write-Up Methods: My partner and I ran two experiments to measure the activity of the enzyme horseradish peroxidase under varied conditions. The first of which measured the effects of altered pH levels‚ while the goal of the second was to examine the effects of varied temperatures. To test the effects of pH on horseradish peroxidase‚ we began by zeroing a Spec 20 with 5.0mL of substrate (25mM guiacol) at pH 6.5. Once the Spec 20 was accurately zeroed‚ we added 100μL
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CHAPTER 3 Methods and Procedure This chapter presents the methods to be used in the study. It also describes the subjects of the study‚ the instruments used‚ the procedure of the data gathering‚ and statistical statement treatment of the data. This study will determine the effectiveness of Advanced Trigonometric Functions Angle Converter on mobile phones in High School students by comparing the students’ performance in their examination and evaluation scores and the teachers’ evaluation
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optional)• Mean and Standard Deviation Exercise 16: Mean and Standard Deviation 1. The researchers analyzed the data they collected as though it were at what level of measurement? a. Nominal b. Ordinal c. Interval/ratio d. Experimental Answer: c. The researchers analyzed the data as though it were at the interval/ratio level since they calculated means (the measure of central tendency that is appropriate only for interval/ratio level data) and standard deviations (the measure of dispersion
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distribution b. t distribution c. the mean of the sample d. the mean of the population Answer: b 2. As the number of degrees of freedom for a t distribution increases‚ the difference between the t distribution and the standard normal distribution a. becomes larger b. becomes smaller c. stays the same d. None of these alternatives is correct. Answer: b 3. For the interval estimation of ( when ( is known and the sample is large‚ the proper distribution to use
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