17. A causal relationship means that a.) Two variable have a positive correlatio

Question

17. A causal relationship means that a.) Two variable have a positive correlation b.) Two variables have a negative correlation Two variables are unrelated d.)) One variable directly affects another 18. If two variables have no correlation á.) The line of best fit has a slope of zero ) The median-median line must be used to predict trends c.) The line of best fit has a negative slope d.) The points on a scatterplot appear to be random 19. What type of correlation would exist between a person's height and his or her stride length (length of a a.) Positive correlation b.) Negative correlation c.) No correlation d.) Inverse correlation 20. Which of the following is an example of a negative correlation? a.) Amount of studying and mark of a test b.) Temperature and number of kids at a pool A person's arm length and leg length The number of people and slices of pizza per person 21-All of the following represent positive correlations except (a. As you get older, your years until retirement changes b.) The longer you study, the better your grades c.) Taller people have longer arms d.) Diets high in cholesterol are linked to heart disease 22. A student hypothesises that increased use of social media causes a decrease level of fitness. She has decided conduct two studies to examine the impact of social media on students in her high-school. She aims to examine the relationship between physical fitness and amount of time spent on social media. She will measure the effects of stair climbing on heart rate and respiration to indicate fitness and compare this data to the average number of hours spent on social media per day. In this study Fitness is the independent variable, hours on social media is the dependent variable. b. Fitness is the dependent variable, hours on social media is the independent variable. c.) Fitness is a quantitative measure, hours on social media is a qualitative measure. d.) Fitness is a qualitative measure, hours on social media is a quantitative measure. 23. Which of the folowing can describe the histogram of a perfectly U-haped distribution? a.) Asymmetric b.) Bars of equal height C.5 Skewed d.) Bimodal

Explanation / Answer

17. d) One variable directly affects another.

18. a) The line of best fit has a slope of zero.

19. a) Positive correlation.

20, d) The number of people and slices of pizza per person.

21. a) As you get older, your years until retirement changes.

22. b) Fitness is the dependent variable, hours on social media is the independent variable.

23. d) Bimodal.

[If it is perfectly U-shaped it can be skewed, asymmetric. You can't say any one of these for sure. But there should be two modes for sure otherwise it will not look like U-shape].

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