22.8 Quick review questions

1. True or false: The value of $\overline{x}$ varies from sample to sample.
   TRUE FALSE
2. True or false: A CI for $\mu$ is statistically valid only if the histogram of the data has an approximate normal distribution.
   TRUE FALSE
3. Suppose $s=8$ and $n=20$. Which one of the following is true?
   The standard error is 1.7889 The standard error is 8 Since the sample size is less than 25, the standard error is invalid