Question 4 of 25 Suppose cluster sampling were being used to survey digital camera
users, who amount to 77% of the population of the United States.
Based on the table below, which city would be considered the best
cluster?
City
Percentage of the population
who are digital camera users
96%
78%
Houston
Las Vegas
Phoenix
San Diego
49%
11%
A. Las Vegas
B. Houston
Ο Ο Ο Ο
C. Phoenix
D. San Diego

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?