A researcher claims that 19 year olds consume 263 less calories per

day than 18 year olds, on average. A study followed 42 people who were 18 years old, recording how many calories they consumed per day. The study then followed the same people one year later, when they were 19 years old, and again recorded how many calories per day they consumed, and calculated the different in daily calories consumption between the two ages. The mean difference was 340.01, and the standard deviation of the differences was 43.8. What would the test static be, for testing the researcher's claim?


Can you please explian this thank you .