Meme & To be an outlier, an observation must outside the mnge a 0.50 to 14.00. 3
ID: 3225667 • Letter: M
Question
Meme & To be an outlier, an observation must outside the mnge a 0.50 to 14.00. 3.50 10.00, When water flows acrous firm land, some ofae is washed away, resulting in aosion An experiment the amount of soil washed away (in kilogams) The dele are Evmia ae following ble between flow rate and amount oferoded soil is neither positive arr argutive. impossible to determine lince both variables are categorical. 0, A researcher measures be comelation berween two variables. This comelation sells us whether there is a relation between twe variables, whether or not scammplot shows an interesting panem. a cause and effect relation exists between twe variables strength of a straight line relation between two variables. of the following suutements is true? correlation coefficient equals the proportion of times two variables lie ona straight line. The correlation coefficient will be +10 only if all the data lie on a perfectly horizontal traight line. The correlation coefficient measures the fraction ofoutiers that appear in a The correlation coefficient is a unitless number and must always lie between -.0 and +1.0, 12. Which of the following is true ofthe correlation coefscient r? resistant measure of association. Irris the correlation betweenxandrthen-ris te correlation between rand r d All of the above using data on the appraised value of homes, a real estate agent computes the least-squares regression line for Predicting a home's value in 2002 from its value in 1992. The equation of leat-squres regression line is $22,000 where y represents a in 2002 and Eis the value in 1992 Answer Q1-16 using this info. 13, A home's value in 1992 is a the intercept.Explanation / Answer
Answer:
8) Correct answer = d (-1.75 to 16.25)
9) The association between flow rate and amount of eroded soil is:
Correct answer: a) positive
The value of both the variables is increasing together suggesting a positive relationship.
10) A researcher measures the correlation between two variables. This correlation tells us
Correct answer: d) the strength of a straight line relation between two variables
Correlation coefficient measures the strength of linear relationship between two variables and also provides information on the direction of linear relationship.
11) Which of the following statement is true?
Correct answer: d) the correlation coefficient is a unitless number and must always lie between -1.0 and +1.0 inclusive
12) Which of the following is true of the correlation coefficient r?
Correct answer: b) -1 <= r < =1
Correlation coefficient always lie between -1 and +1
13) A home value in 1992 is:
Correct answer: c) the explanatory variable
Since the value of the home in 2002 is predicted based on the value of the explanatory variable of cost of house in 1992
14) Suppose Joe owns a house that was worth $100,000 in 1992, what would be the predicted value of his home in 2002?
Correct answer: a) $182,000
Based on the regression equation y = $22000 + 1.6(x) = $22000 + 1.6*(100,000) = $182,000
15) Which of the following is true of the least square regression line?
Correct answer: d
16) the least square regression line is:
Correct answer: b) the line that makes the sum of the squares of the vertical distances of the data points from the line as small as possible
17) What percent of all historical brook trout population was found to be extirpated in the sample?
Correct answer: c) 50.0%
It can be calculated as (25+80+195)/600 = 300/600 = 0.5 or 50%
18) What percent of habitats subject to medium levels of urbanization was found to be present?
Correct answer: c) 60%