When is it appropriate to make inferences about a population based upon data collected from a sample when the sample is selected at random from the population of interest any time an experiment is conducted any time an observational study is conducted when a sample is selected from the population of interest

Find the mean time of Bert's last five downhill skiing runs: 98 sec , \( 90 \mathrm{sec}, 102 \mathrm{sec}, 97 \mathrm{sec} \), and 113 sec .

A survey asked buyers whether color, size, or brand influenced their choice of cell phone. The results are below. 153 said size. 232 said brand. 168 said color. 95 said size and brand. 62 said color and size. 101 said color and brand. 21 said all three. 92 said none of these How many buyers were influenced by color and size, but not brand? How many buyers were not influenced by color? How many buyers were surveyed? Question Help: Video Check Answer

Uma escola de \( 1^{10} \) grau abriga 124 alunos. Obtenha uma amostra representativa cor- respondendo a \( 15 \% \) da população. Sugestão: use a \( 8^{a}, 9^{a} \) e \( 10^{a} \) colunas, a partir da \( 1^{\text {a }} \) linha, da Tabela de Números Aleatórios (de cima para baixo).

4) In a telephone poll of 25 people, 9 people said they like shopping. What is the ratio of the number of people who do not like shopping to the number of people who like shopping? \[ 16: 9 \] \( 50: 16 \)

What is the mean of the prime numbers greater than 30 but less than 45 ?