STATISTICS AND PROBABILITY

Solve the following problems. 1. it is said that the average life span of a light bulb is 5.5 years. A researcher wants to test If it is true. He randome picks 27 light bulbs and nds that it has a sample mean of 4.3 years with a standard deviation of 1.29 years. At a: = 0.10. is there enough evidence to claim that it is not 5.5 years? Solutlon: Null Hypothesis: Alternative Hypothesis: Type of test: it = df= tn." = Solve for the computed value. {comp = Compare the critical value and computed value. Statistical Decision: Conclusion