Which of the following samples would constitute a biased sample? two thousand people were randomly surveyed about their favorite candy in four different cities in arizona to determine arizona’s favorite candy. a tele-market research company randomly called and surveyed one thousand men and women over the age of 65 to determine which insurance companies were preferred in retirement. seventh grade girls were randomly surveyed to determine what theme the whole school would prefer for the dance. kids at a large preschool were randomly surveyed to determine the color most preschoolers like best at that school.

Match each expression with its simplified form.

Fredrick designed an experiment in which he spun a spinner 20 times and recorded the results of each spin

In a test for esp (extrasensory perception), a subject is told that cards only the experimenter can see contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is just guessing has probability 0.25 of guessing correctly on each card. a. the count of correct guesses in 20 cards has a binomial distribution. what are n and p? b. what is the mean number of correct guesses in 20 cards for subjects who are just guessing? c. what is the probability of exactly 5 correct guesses in 20 cards if a subject is just guessing?