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4. An association of City Mayors conducted a study to determine the average number of times a family went to buy necessities in a week. They found that the mean is 4 times in a week. A random sample of 20 families were asked and found a mean of 5 times in a week and a standard deviation of 2. Use 5% significance level to test that the population mean is not equal to 5. Assume that the population is normally distributed. Step 1: Formulate the null and alternative hypotheses. Step 2: Specify the level of significance to be used. Step 3: Select and compute the appropriate test statistic. Step 4: Determine the critical region/s. Step 5. Make a statistical Decision. Step 6: Draw the appropriate conclusion