An ANOVA is used rather than a t-test in the following situations: when there are more than two sample groups. when there are more than one independent variable in the experiment. when you have a between groups variance and a within groups variance. all of the above.

Based on historical data at Oxnard college, they believe that \( 42 \% \) of freshmen do not visit their advisors regularly. For this year, you would like to obtain a new sample to estimate the proportion of freshmen who do not visit their advisors regularly. You would like to be \( 90 \% \) confident with a margin of error of \( 4 \% \). Assume the conditions are met and use the appropriate formula to determine how many people you would need to sample. Enter an integer or decimal number [more..] Show your steps on paper or in the add work box: Question Help: \( \square \) Message instructor Add Work

a. Dans une série statistique, s'il y a autant de don- nées supérieures à 12 que de données inférieures à 12, alors la moyenne est obligatoirement égale à 12 . b. La taille moyenne de n'importe quel groupe d'en- fants mesurant entre \( 1,40 \mathrm{~m} \) et \( 1,50 \mathrm{~m} \) est \( 1,45 \mathrm{~m} \). c. Un magasin a en stock 100 pulls dont \( 10 \% \) sont noirs et 200 tee-shirts dont \( 70 \% \) sont noirs. On peut en conclure que la moitié de ces vêtements sont noirs.

Question 8 The heights of 10 -year-olds, regardless of gender, closely follow a Normal distribution with a mean of 56 inches and a standard deviation of 5 inches. a. What is the probability that a randomly chosen 10 -year-old is shorter than 48 inches? (Round to 4 decimal places.) b. If the tallest \( 10 \% \) of the class is considered "very tall", what is the height cutoff for "very tall"? (Round to 2 decimal places.) [SAB2]

Если у вас есть набор данных: (2,3), (4,5), (6,7), как вы можете изобразить эти точки на диаграмме рассеяния?

Что такое диаграмма рассеяния и для чего она используется?