A student randomly selects 10 paperbacks at a store. The mean price is $8.75 with a standard deviation of $1.50.Construct a 95% confidence interval for the population standard deviation, σ. Assume the data are normallydistributed.
A) ($1.03, $2.74)
B) ($0.43, $1.32)
C) ($1.43, $2.70)
D) ($1.76, $3.10)

Question

Quizplus · Accepted Answer

The confidence interval for the population standard deviation is calculated using the chi-square distribution. With 9 degrees of freedom (n-1=10-1), the interval is ($1.03, $2.74).

A Student Randomly Selects 10 Paperbacks at a Store