1.2 Below we list several variables. Which of these variables are quantitative and which are qualitative? Explain. a. The dollar amount on an accounts receivable invoice. Answer – Quantitative as the value is a number b. The net profit for a company in 2009. Answer – Quantitative as the value is a number. c. The stock exchange on which a company’s stock is traded Answer – Qualitative as it is descriptive or categorical. d. The national debt of the united states in 2009. Answer
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at the end of module 1 3 6 4 7 5 4 6 4 7 1 8 1 More 0 Q1 Descriptive Statistics Excel Worksheet b Q2 d Q3 e Q4 b 5. For the following sample of scores: 2‚ 6‚ 1‚ 4‚ 2‚ 2‚ 4‚ 3‚ 2 Mean variance standard deviation 2.889 2.099 1.537 Find the mean‚ variance and standard deviation 6. A sample of size 7 (n = 7) has a mean of M = 9. One of the sample scores is changed from x = 19 to x = 5. What is the value for the new sample mean? New Sample Mean 7 7. Using Excel
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normal random variable: Theorem 1: Suppose Y = ln X is a normal distribution with mean m and variance v‚ then X has mean exp( m + v /2 ) Proof: The density function of Y= ln X Therefore the density function of X is given by Using the change of variable x = exp(y)‚ dx = exp(y) dy‚ We have = Note that the integral inside is just the density function of a normal random variable with mean (m-v) and variance v. By definition‚ the integral evaluates to be 1. Proof of Black Scholes Formula Theorem
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precipitation will influence beak size. • Variances in beak size will influence beak size. MATERIALS The materials needed for this experiment consist of a computer and access to the Evolution Lab on the University of Phoenix student website. In the Evolution Lab there are two islands‚ Darwin Island and Wallace Island. There are seven variables that can be changed to run many different experiments on both islands. The variables are beak size‚ variance of beak size‚ heritability‚ clutch size‚ island
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course was then recorded in hours. The table below summarizes the data collected. From this data we can note that the two methods have a very comparable completion time as the means of both are just above 75 hours. We can also note that the variance is less for the proposed method. To test the difference between the two population means we conducted the following hypothesis test. Ho:u_1-u_2=0 Ha:u_1-u_2≠0 With this hypothesis test established‚ using the information summarized earlier
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were unequal variances amongst both male and female data sets. Results There is a normal distribution of the data with ranges in size from size 5 to size 14 amongst the participants. With these ranges‚ the mean is 9.142‚ with a standard deviation of 2.583 and a variance of 6.670. Appendix B: Male vs. Female data sets‚ show the mean‚ standard deviation and variance for both of these sets respectively. Female data sets have a mean of 7.111‚ standard deviation of 1.131‚ and a variance of 1.281 whereas
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Cognitive Experimental Research Report. The Effect of Word and Picture Stimuli on the Number of Items Recalled. Abstract Based on Standing’s (1973) examination of recognition memory and the recall of words and pictures which supported the picture superiority effect‚ this experiment measured the number of items recalled by participants that had either been given word
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Leading the list was Bank of America‚ followed by JP Morgan Chase and Citibank. Following is an Excel Analysis of total assets ($ billions) of these banks using the descriptive statistics feature. Study the output and describe what you can learn about the assets of these top 100 banks from the output. Top 100 Banks in the U.S Mean Standard Error Median Mode Standard Deviation Sample Variance Kurtosis Skewness Range Minimum Maximum Sum Count 76.5411 17.93374 21.97 13.01 179.3374 32161.9 22
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been 10% of the number of employees in a given year. 2) The number of workplace injuries‚ X‚ typically follows a Poisson distribution with a parameter λ‚ where E(X) = λ and Variance(X) = λ. 3) We can reasonably approximate the Poisson distribution via a Normal distribution‚ with the same expected value and variance (according to Central Limit Theorem‚ for which you don’t need to know the details). 4) You will also need to use the critical value for the standard Normal distribution (i.e
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CLICK TO DOWNLOAD MAT 540 Week 2 Quiz Question 1 If variable costs increase‚ but price and fixed costs are held constant‚ the break even point will decrease. Question 2 Parameters are known‚ constant values that are usually coefficients of variables in equations. Question 3 Probabilistic techniques assume that no uncertainty exists in model parameters. Question 4 In general‚ an increase in price increases the break even point if all costs are held constant. Question 5 P(A | B) is the
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