Homework Answers
Please don't hesitate to give a "thumbs up" for the answer in case the answer has helped you
a. Change of units, or conversion factor ( like treating height in inches instead of cm), or multiplying the whole column by a positive constant will not effect the correlation.
Here we just take the variable in different units, case as above.
Hence, correlation is not going to change.
Answer: A) 0.40
b. D) is correct.
You can 't calcualate r for a categorical variable and a continous variable, that' impossible.
Answer: D) is correct
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(4 points) For each problem, select the best response. (a) For a biology project, you measure...
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consider Question 8 (0.1 points) Consider any two events A and B, such that P(A) =...
consider
Question 8 (0.1 points) Consider any two events A and B, such that P(A) = 0 and PB) +0. Which of the following statements is always FALSE? a) If events A and B are independent, then P(AB) = PA) and P BIA) - PB). b) If events A and B are disjoint, then PA and B) - 0. c) If events A and B are independent, then P{A and B) - 0. d) If events A and B are...
For each problem, select the best response. (a) The points on a scatterplot lie close to...
For each problem, select the best response. (a) The points on a scatterplot lie close to the line whose equation is y = 2x – 8. The slope of the line is O A. -2 o B. 10 o C. 8 D. 2 E. None of the above. (b) Smokers don't live as long (on the average) as nonsmokers, and heavy smokers don't live as long as light smokers. You regress the age at death of a group of male...
Men tend to have longer feet than women. So, if you find a really long footprint...
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(2 points) For each problem, select the best response. a) The nicotine content in cigarettes of a certain brand is normally distributed with mean (in milligrams) u and standard deviation o=0.1. The brand advertises that the mean nicotine content of their cigarettes is 1.5, but you believe that the mean nicotine content is actually higher than advertised. To explore this, you test the hypotheses H. :p=1.5, H iu > 1.5 and you obtain a P-value of 0.052. Which of the...
The Quantitative Environmental Learning Project reported widths and lengths (in centimeters) of a sample of 88...
The Quantitative Environmental Learning Project reported widths and lengths (in centimeters) of a sample of 88 Puget Sound butter clams. Output is shown for the regression of length on width. Pearson correlation of Width and Length = 0.989 The regression equation is Length = 0.257 + 1.22 Width Predictor Coef SE Coef T P Constant 0.25689 0.09293 2.76 0.007 Width 1.22013 0.01940 62.89 XXXXX S = 0.3253 R-Sq = 97.9% R-Sq(adj) = 97.8% (a) Why would it be natural for the relationship...
7231/assignments/295420?module item_id- 1084344 (1 point) For each problem, select the best response. (1) Fred keeps his...
7231/assignments/295420?module item_id- 1084344 (1 point) For each problem, select the best response. (1) Fred keeps his savings in his mattress. He began with $650 trom his mother and adds $100 each year His total savings y after r years are given by the equation OA. y 650 100z OB.y 650+100 Oc. y-100+650z OD. y 100+ O E. None of the above. (2) Smokers don't live as long (on the average) as nonsmokers, and heavy smokers don't live as long as...
1. In the regression equation, the value that gives the amount by which Y changes for...
1. In the regression equation, the value that gives the amount by which Y changes for one unit in X is called the (a) coefficient of correlation. (b) coefficient of determination. (c) slope. (d) intercept. 2. For any two categorical variables, X and Y, the best way to determine if they are related is to (a) calculate the correlation between X and Y. (b) draw a scatterplot of the X and Y values. (c) make a two-way table of the...
Select the BEST answer for each of the questions below (I true, F- false). Cirele the letter that corresponds with the answer you have selected. Each question is worth 2 points. [Total 40...
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Direction: Indicate the points that you have scored in the column on the right for each...
Direction: Indicate the points that you have scored in the column on the right for each of the following risk factors. When you finish, total your points and compare that with the results at the end of the activity. Risk factors Score 1. Age 56 or over Age 55 or under 1 0_____ 2. Gender Male Female 1 0_____ 3. Family history If you have: Blood relatives who have had a heart attack or...
consider
Question 8 (0.1 points) Consider any two events A and B, such that P(A) = 0 and PB) +0. Which of the following statements is always FALSE? a) If events A and B are independent, then P(AB) = PA) and P BIA) - PB). b) If events A and B are disjoint, then PA and B) - 0. c) If events A and B are independent, then P{A and B) - 0. d) If events A and B are...
For each problem, select the best response. (a) The points on a scatterplot lie close to the line whose equation is y = 2x – 8. The slope of the line is O A. -2 o B. 10 o C. 8 D. 2 E. None of the above. (b) Smokers don't live as long (on the average) as nonsmokers, and heavy smokers don't live as long as light smokers. You regress the age at death of a group of male...
(2 points) For each problem, select the best response. a) The nicotine content in cigarettes of a certain brand is normally distributed with mean (in milligrams) u and standard deviation o=0.1. The brand advertises that the mean nicotine content of their cigarettes is 1.5, but you believe that the mean nicotine content is actually higher than advertised. To explore this, you test the hypotheses H. :p=1.5, H iu > 1.5 and you obtain a P-value of 0.052. Which of the...
7231/assignments/295420?module item_id- 1084344 (1 point) For each problem, select the best response. (1) Fred keeps his savings in his mattress. He began with $650 trom his mother and adds $100 each year His total savings y after r years are given by the equation OA. y 650 100z OB.y 650+100 Oc. y-100+650z OD. y 100+ O E. None of the above. (2) Smokers don't live as long (on the average) as nonsmokers, and heavy smokers don't live as long as...
Select the BEST answer for each of the questions below (I true, F- false). Cirele the letter that corresponds with the answer you have selected. Each question is worth 2 points. [Total 40 points) Answer uestion E1. Power is the ability to reject the null hypothesis when it should be rejected 2. With curvilinear data, the Pearson r statistic is an appropriate, accurate statistical tool In a research report, the term statistically significant is used to indicate that the null...
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