1. Research Question: Is the average height of adult males in a particular city significantly different from the national average? 2. Hypotheses: Null Hypothesis (H0): The average height of adult males in the city is equal to the national average. Alternative Hypothesis (H1): The average height of adult males in the city is not equal to the national average. 3. One Sample t-test: The one sample t-test is used to compare the mean of a single sample to a known population mean. In this case, we would collect a sample of adult male heights from the city and calculate the sample mean and standard deviation. The t-statistic is then calculated using the formula: t = (sample mean - population mean) / (sample standard deviation / sqrt(sample size)). The resulting t-value is compared to a critical t-value (based on the desired level of significance and degrees of freedom). If the calculated t-value is greater than the critical t-value, we reject the null hypothesis in favor of the alternative. 4. Confidence Interval: A confidence interval for the mean can also be used to test the hypotheses. A 95% confidence interval, for example, is the range within which we are 95% confident that