unionmember
25. Union Membership. The table contains the total union membership for seven randomly selected states. Construct and interpret a 95% confidence interval for . Assume the data are normally distributed.
| State | Union membership (1000s) |
|---|---|
| Florida | 397 |
| Indiana | 334 |
| Maryland | 342 |
| Massachusetts | 414 |
| Minnesota | 395 |
| Texas | 476 |
| Wisconsin | 386 |
8.99.25
Lower bound = 30.537, upper bound = 104.367. We are 95% confident that σ, the population standard deviation of total union membership per state, lies between 30.537 and 104.367 thousand.