Activities Activity 1. Identify the independent and dependent variables in the following statements.
1) The more time people spend using social media, the less they read books.
Independent Variable:
Dependent Variable:
2) Drinking energy drinks makes people more aggressive.
Independent Variable:
Dependent Variable:
3) Taking a nap in the afternoon makes people more focused for the rest of the day.
Independent Variable:
Dependent Variable:
4) Spending time with a family dog decreases the amount of stress someone is feeling.
Independent Variable:
Dependent Variable:
5) Eating breakfast in the morning increases the ability to learn in school.
Independent Variable:
Dependent Variable:

Farmers know that driving heavy equipment on wet soil compresses the soil and injures future crops. here are data on the "penetrability" of the same type of soil at two levels of compression. penetrability is a measure of how much resistance plant roots will meet when they try to grow through the soil. compressed soil 2.85 2.66 3 2.82 2.76 2.81 2.78 3.08 2.94 2.86 3.08 2.82 2.78 2.98 3.00 2.78 2.96 2.90 3.18 3.16 intermediate soil 3.17 3.37 3.1 3.40 3.38 3.14 3.18 3.26 2.96 3.02 3.54 3.36 3.18 3.12 3.86 2.92 3.46 3.44 3.62 4.26 use the data, omitting the high outlier, to give a 95% confidence interval for the decrease in penetrability of compressed soil relative to intermediate soil. compute degrees of freedom using the conservative method. interval: to