|T F |1. |If on average y increases as x increases‚ the correlation coefficient is positive. | |T F |2. |Pearson’s correlation coefficient‚ r‚ does not depend on the units of measurement of the two variables. | |T F |3. |The value of Pearson’s r is always between 0 and 1. | |T F |4. |If r is close to 1‚ then the points lie close to a straight line with a positive
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2/8 (Friday) Standard Deviation cont’d Example: Amount of money earned by new immigrants Sample: 12‚ 15‚ 16‚ 20‚ 25‚ 36‚ 40 Step 1: Find the mean * x̄=164/7 * mean is 23.4 Step 2: Find how much each observation deviates from the mean * 12 - 23.4 = -11.4 * 15 – 23.4 = -8.4 * 16 – 23.4 = -7.4 * 20 – 23.4 = -3.4 * 25 – 23.4 = 1.6 * 36 – 23.4 = 12.6 * 40 – 23.4 = 16.6 * Note: all observations below mean will be negative‚ all above will be positive Step
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Introduction The current state of the world economy is quite uncertain. Economic statistics that governments and other financial institutions use to project the economy imply that the world economy is shrinking. Since 2008‚ the state of the American economy has not been attractive. For instance‚ the United States economy has not registered any significant growth for the last three years. The 2011 second quarter results indicated that gross domestic product improved by 1%. At the same time‚ there
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The Importance of Exercise Exercising is a key component of living a healthy life. “Regular exercise is necessary for physical fitness and good health. It reduces the risk of heart disease‚ cancer‚ high blood pressure‚ diabetes and other diseases. In my generation exercising can be over looked.”(Why is) People seem to be consumed more with television shows‚ fast food‚ and other unhealthy activities. “The average American watches three and a half hours of television every day. That adds up to 56
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Kobe Ryan 11-17-09 KNES 342 Relaxation Paper The method I chose as a relaxation/stress-relief technique is Exercising. Exercising is one the most important things to do to keep your body not only healthy physically‚ but mentally as well. I find myself going to the gym almost five days a week to relieve myself from the stressful environment that I endure every week. Whether it would be from work‚ school‚ or issues happening at home or around me‚ Exercising and going to the gym will help me clear
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Chapters 1-3:In order to control costs‚ a company wishes to study the amount of money its sales force spends entertaining clients. The following is a random sample of six entertainment expenses (dinner costs for four people) from expense reports submitted by members of the sales force. $157‚ $132‚ $109‚ $145‚ $125‚ $139. Calculate the mean and sample variance(s^2) and standard deviation. Mean = 807/6 = 134.5. Sample Variance = (109925 – (807^2/6)/6-1 = (109925 – 108541)/5 = 1384/5 = 276.8.
Free Random variable Standard deviation Normal distribution
Hypothesis: Ho: P = .10 (Mr. Plex and consortium will seriously consider settlement) H1: P < .10 (Mr. Plex and consortium will rigorously defend any lawsuit by Tommy) Analysis: For this case‚ we use 0.01 as the significance level. In a hypothesis test‚ a Type I Error occurs when the null hypothesis is rejected when it is in fact true. That means if the consortium decides to consider a settlement when greater than 10% of the patrons resented ads/commercials is true and we reject the null hypothesis
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Improvements 6 The effect of exercise on the heart rate and breathing rate Introduction Aim: Finding out how exercise affects the heart rate and breathing rate. Hypothesis: Exercise exists in different forms and has many benefits; it improves the oxygen-carrying capacity of the blood‚ development of bones‚ strengthens muscles and the lungs capacity plus it can make you feel good. There are different exercises and intensities for different benefits. Lower intensity exercises are not designed to work
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9Name: Brielle Cantagallo Class: Statistics Date: 3/17/13 □ EXERCISE 29 Questions to be Graded * 1.Were the groups in this study independent or dependent? Provide a rationale for your answer. The groups in this study were independent because the two sets of data were not taken from the same subjects. The subjects were in one group: female and the second group: male. * 2.t = −3.15 describes the difference between women and men for what variable in this study? Is this value significant
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EXERCISES FOR MICROECONOMICS TOPIC 1 Economics: An Introduction (Chapters 1 & 2 in the Textbook) EXPLAIN THE FOLLOWINGTERMS ◎ Average benefit ◎ Average cost ◎ Economic surplus ◎ Economics ◎ Microeconomics ◎ Macroeconomics ◎ Marginal benefit ◎ Marginal cost ◎ Normative economics ◎ Positive economics ◎ Rational person ◎ Sunk cost ◎ Opportunity cost ◎ Absolute advantage ◎ Comparative advantage ◎ Attainable point ◎ Unattainable point ◎ Efficient point ◎ Inefficient
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