Problem 12 in Chapter 9 described a study that examined

the spotlight effect, which refers to people overestimating

the extent to which others notice their

appearance or behavior. In the study, n = 9 participants

were asked to put on a Barry Manilow T-shirt

and walk into a room where other students were

working. Later, the participants were asked to estimate

how many students in the room noticed the shirt. The

average estimate for the nine participants was M = 6.4

with SS = 162.

a. Make a point estimate of the number of people that

participants think noticed the shirt.

b. Compute the 90% confidence interval for the mean

number of people.

c. After interviewing the students in the room, the

researchers found that an average of μ = 3.1 students

actually noticed the shirt. Based on this value

and your answers from a and b, how much do people

overestimate t

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