1)When is the right - tailed hypothesis testing used?

1. When the claim states that the parameter is smaller
2. When the claim states that the parameter did not change
3. When the claim states that the parameter is bigger
4. There is no such thing as right - tailed hypothesis testing
5. When the claim states that the parameter is decreased twice. 2)When the population standard deviation is known and the sample size is less than 30, what table value should be used in computing a confidence interval for a mean? 3)When is the left - tailed hypothesis testing used?