Homework Assignment #2.docx

# D the measurements in the graph were obtained from

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( D ) The measurements in the graph were obtained from six swordfish. Can we treat the 20 measurements as a random sample? Why or why not? Answers: ( A ) In this problem, two numerical variables are displayed ; on the y-axis, flicker fusion frequency, and on the x-axis, eye temperature. ( B ) From the graphical representation displayed on page 60, this graph is a scatter plot ; more specifically, it is showing the relationship between two numerical variables. ( C ) As seen from the graph, the two variables are associated ; the relationship between flicker fusion frequency and temperature is positive , representative by both moving in the same direction . Additionally, this relationship is linear as a change in temperature causes a change in frequency . ( D ) We cannot treat this as a random sample ; the sample size is too small and therefore cannot be treated as random . Question 3 [ Statement ]: Examine the following figure [on page 63], which displays hypothetical measurements of a sample of individuals from several groups. Questions: ( A ) What type of graph is this? ( B ) In which of the groups is the frequency distribution of measurements approximately symmetrical? ( C ) Which of the frequency distributions show positive skew? ( D ) Which of the frequency distributions show negative skew? ( E ) Which group has the largest value for the upper quartile? ( F ) Which group has the smallest value for the median?
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• Fall '17
• John doe
• Dr. Rebecca Fang

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