A study by the Web metrics firm Experian showed that in August of 2018, the mean time spent per visit to INSTAGRAM was 20.8 minutes with a population standard deviation of 8 minutes. Suppose a simple random sample of 60 visits in August 2020 has a mean of 21.5 minutes. A social scientist is interested to know whether the mean time of INSTAGRAM visits has changed. Use = 0.05. Show all steps.

1. State the Null and Alternative Hypothesis

2. Find the Standard Error of the Mean M = n

3. Find the Standard Error Z-Score (STANDARD SCORE) SE z-score = M m

4. Use the Alpha-Level Z-Score & STANDARD SCORE to Accept or Reject H0 (sketch the graph)

5. Conclusion