4. A barangay official claims that Step 1: Formulate the null and alternative hypothesis. Given: at least 95% of the residents in his H(o): area have mobile phones. To test this claim, a researcher randomly selected a sample of 150 residents and found that 145 of H(a): them do have mobile phones. At 1% level of significance, what can you conclude? Step 2: Level of Significance. Step 3: Test Statistic Step 4: Critical Values Step 5: Decision Step 6: Conclusion/Interpretation