INSTRUCTION: Draw the conclusion for each of the following by using the five-step hypothesis testing procedure. Show your solution using thecritical-value method.

1. The manufacturer of a local cellphone brand claims that 65% of their customers believed that the cellphones they bought from them are as good as the international brands. To test the claim, they surveyed one gadget store. Out of the 90 randomly selected shoppers, 75 of them agreed with the manufacturer's claim. Is the claim of the manufacturer valid? Test at 0.01 significance level. CRITICAL VALUE METHOD STEPS SOLUTION 1. State the null and alternative hypothesis. 2. Choose the level of significance. 3. Compute the test statistic. 4. Determine the critical value. 5. Draw a conclusion. 2. A nationwide poll claims that the country's president has less than a 64% approval rating. In a random sample of 120 people, 69 people gave the president a positive approval rating. Test the claim at a 0.05 level of significance. CRITICAL VALUE METHOD STEPS SOLUTION 1. State the null and alternative hypothesis. 2. Choose the level of significance. 3. Compute the test statistic. 4. Determine the critical value. 5. Draw a conclusion