The government report says that the average amount of money spent per U.S. household per week on food is about $158. A random sample of 50 households in a small city is selected, and their weekly spending on food is recorded. The sample average data had a mean of 165 and a standard deviation of $20. Is there convincing evidence at the significance level of 0.05 that the mean weekly spending on food in this city differs from the national figure of $158?
Do the 4-step process​