Найди дисперсию числового ряда \( 4 ; 9 ;-5 ;-18 \). Заполни пропуски, во всех ячейках округление выполняй до сотых. 1. Среднее арифметическое ряда: \( \frac{(4+9+(-5)+(-18))}{4}=\square \) 2. Квадрат отклонения каждого числа: \( (4-(-2,5))^{2}=42,25 \); \( (9-(-2,5))^{2}=\square \) \( (-5-(-2,5))^{2}=\square \) \( (-18-(-2,5))^{2}=240,25 \). 3. дисперсия: \( \frac{(42,25+132,25+6,25+240,25)}{4}=\square \)

What do correlations less than zero signify? A that the relationship between the variables is negative B correlation statistic can't have negative value (C) We need to square the correlations to get rid of the negative numbers (D) There is an error made

The appropriate degrees of freedom for the distribution used in correlation is \( \mathrm{df}=\mathrm{N}-\mathrm{k} \). (A) True (B) False

(a) The percentage of infected people reaches a maximum after 11 days. (Simplify your answer.) (b) The maximum percent of the population infected is \( \square \% \). (Round to the nearest hundredth as needed.)

What is the test statistic for correlation? (A) i (B) F (D) z (D)

Correlation is a relatively quick way to test for causality as well as statistical significance. (A) True (B) False