Calculate t tests and confidence intervals for the following sets of information

Calculate t tests and confidence intervals for the following sets of information, using the confidencelevel indicated. Then comment on statistical significance, say whether we reject or fail to reject the null,and tell me how you know.
1. β-hat = 2.94497, se = 4.863653, n = 580, independent variables = 2, use 95% confidence level.

2. β-hat = -19.3, se = 0.6807, n = 5, independent variables = 1, use 95% confidence level.

3. Murder rate = .348 + .165(EXEC) + 1.26(UNEMPL)
(2.69) (1.94) (0.437)n=153, use 99% confidence (do both variables)