Isulat sa patlang ang yugto ng panahon ng mga unang tao sa daigdig ayon sa kagamitan.
1. Pangangaso at pangingisda
2. Ginto ang kauna-unahang natuklasan
3. Nalinang mabuti ang paggawa at pagpapanday

Researchers are conducting a study in an attempt to establish a linear relationship between the number of online music video views and the number of guitar sales. a computer output for regression is shown and is based on a sample of seven observations. predictor coeff st. dev t ratio p-value constant 7.85671094 1.316226455 5.969118 0.001889 music video views 0.094781123 0.027926367 3.393965 0.019378 what represents the 99% confidence interval for the slope of the regression line? 0.0948 ± 3.499(1.3162) 0.0948 ± 4.032(1.3162) 0.0948 ± 3.707(0.0279) 0.0948 ± 4.032(0.0279)