True false question
1. refraction occurs because waves change speed in a new medium. (true/false)
short answer questions
fill in the answer blanks with the correct answer.
3.
2. an echo is an example of the type of wave interaction called
fill in the blanks questions
fill in the answer blanks with the correct answer.
is the bending of waves when they enter a new medium at an angle.
occurs when waves spread out and travel around obstacles or
through openings in obstacles.
is the bouncing back of waves from a surface that they cannot pass
5.
through

7. see worksheet 1 for values of variables x1, x2 and x3 and answer the following questions: a. for each variable find the mean, median, coefficient of skewness, range and population standard deviation. b. compared to variable x1, how are the mean and median affected by extreme values (outliers) seen in x2 and x3. c. is the median or mean the better measure of location for x2 and x3? explain. d. explain the differences in the magnitudes of the skewness coefficients for the three variables. e. what is the relationship between the range and standard deviation looking across the three variables?