I just want to ask this is my answe is it correct? Part A -Multiple Choices Circ
ID: 3234856 • Letter: I
Question
I just want to ask this is my answe is it correct? Part A -Multiple Choices Circle the best answer (6 x 1 6 marks) For each question circle the correct response. There is only one correct response for each question. The following information applies to questions 1,2 and 3 A study was conducted to examine the relationship between quality of fish and number of hours in ice storage. For this study: y- measurement of fish quality (on a 10 point scale with 10 BEST x number of hours in ice storage The sample linear regression line y on x is: 8.5-0.5x. 1. The slope of the above regression equation indicates: (a) If the estimated quality increases by 1 then the fish have been packed in ice one hour sooner on average. (b) If the estimated quality increases by 1 the fish have been packed in ice two hours later on average. c) If the number of hours in ice storage increases by 1 hour then the measurement of fish quality decreases by 0.5 on average. (d) Can't really say until we see a plot of the data. 2. The approximate measurement of fish quality after half a day in ice storage is: (a) 8.25 (d) one of the above 3. Which of the following is true: (a) There is a positive relationship between "the quality" and "the number of hours in ice storage" of a fish. (b) There is a significant relationship between "the quality" and "the number of hours in ice storage" of a fish. (c) There is a negative relationship between "the quality" and "the number of hours in ice storage" of a fish (d) The quality of the fish is the independent variable and the number of hours in ice storage is the dependent variable.Explanation / Answer
SOlution:-
1) The negative sample correlation indicates That the larger value of independent variable are associated with smaller values of dependent variables.
Negative sample correltaion indicates that if the value of the indepndent variable increases then the value of the dependent variable would decreases.
2) c) The coefficient of determintaion r2 must be a value 0 < r2 < 1.
The coefficient of determintaion r2 is a square of correlation coefficient so r2 can never be negative.
3) b) Segmented bar charts.
4) c) Both rows sum and column sums should add upto grand sum.