Reference no: EM132853383
1. A manager of a local car dealer examines the relationship between advertising (in $1000s) and sales (in$1000s) by reviewing the store's data for the previous six months
1. Calculate the mean of advertising and the mean of sales.
2. Calculate the standard deviation of advertising and the standard deviation of sales.
3. Calculate and interpret the covariance between advertising and sales.
Advertising Sales
25 15
29 16
21 19
23 18
26 20
26 17
2. The scores of the homework 1 assignment for 25 students in DM302 are the following: 0, 2, 5, 8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 14, 15, 17, 17, 18, 20, 20 Plot a boxplot for these numbers with proper labels and explain how you determine Q1, Q3, and IQR values. Identify outliers if any (with an explanation as well), and comment on these scores' skewness.
3. A sample of data analysts' salaries at a local technology park revealed a mean income of $73,000 with a standard deviation of $2,800.
1. What is the z value of a student earning $80,000?
2. Assume that salaries follow a bell-shaped distribution. Using the empirical rule, what percentage of the analysts earns at least $67,400 but no more than $78,600?