3. Starting teachers salaries (in equivalent U.S. dollars) for upper secondary education in selected countries are listed
Question:
3. Starting teachers’ salaries (in equivalent U.S. dollars) for upper secondary education in selected countries are listed below. Which set of data is more variable? (The U.S. average starting salary at this time was $29,641.)
4. Which has a better relative position: a score of 75 on a statistics test with a mean of 60 and a standard deviation of 10 or a score of 36 on an accounting test with a mean of 30 and a variance of 16? Justify your answer.
5. The data represent the values in billions of dollars of the damage of 10 hurricanes.
1.1, 1.7, 1.9, 2.1, 2.2, 2.5, 3.3, 6.2, 6.8, 20.3
a. What is the percentile rank of 20.3?
b. What value corresponds to the 40th percentile?
6. The average height of a certain age group of people is 53 inches. The standard deviation is 4 inches. If the variable is normally distributed, find the probability that a selected individual’s height will be a. Greater than 59 inches b. Less than 45 inches
7. An educator wants to see how the number of absences for a student in her class affects the student’s final grade. The data obtained from a sample are shown.
Do a complete regression analysis by performing these steps.
a. Draw a scatter plot.
b. Compute the correlation coefficient.
c. Test the significance of the correlation coefficient @ a= 0.05
d. Determine the regression line equation.
e. Interpret the results.
Elementary Statistics A step by step approach
ISBN: 978-0073386102
8th edition
Authors: Allan Bluman