Instructor: T. Steffy Read the following problems carefully and perform the hypothesis test about the given claim. Due: on TEST 4 day Problem #5 A headline read: "More than half of Americans Say Federal Taxes Too High". The headline was based on a simple random sample of 1026 adult Americans in which 534 stated accurate headline? Use a 0.05 significance level. (Round to 4 decimals) + stated the amount of federal taxes they have to pay is too high. Is this an Write the claim in symbolic form: H1: Circle the Hypothesis that matches your claim ! Step 1: Ho: Step 2: Test Statistic: Z-stat = Step 3: P-Value = Decision: Step 4: a = Step 5: Conclusion:. roblem #6: In a study of store checkout -scanners, 1234 items were checked for pricing accuracy; 20 checked items were round to be overcharges, and 1214 checked items were not overcharges. Use a 0.05 significance level to test the claim that with Scanners, 1% of sales are overcharges. Based on these results, do scanners appear to help consumers avoid overcharges? (Round to 4 decimals) Write the claim in symbolic form:. Step 1: Ho: H1: Circle the Hypothesis that matches your claim ! Step 2: Test Statistic: Z-stat = Step 3: P-Value = Step 4: a = Decision: Step 5: Conclusion: Section 8-3: Testing a Claim About a Mean When o is not known, and s (standard deviation of the sample) is known, use a "T test" that incorporates the Student t-distribution. STAT / T - STAT When o is known, use a "Z-stat" that incorporates the normal distribution. STAT / Z - Stat Problem #7: Claim: the mean IQ score of statistics professors is normally distributed and greater than 134. Sample data: n= 12, sample mean= 137, s=15, significance level = 0.05 (Round to 4 decimals) Write the claim in symbolic form: Step 1: Ho: H1: Circle the Hypothesis that matches your claim ! Step 2: Test Statistic: T-stat =