Question

The following data from a random sample represents the average daily energy intake in kJ for each of eleven healthy women:

5260    5470     5640     6180     6390     6515     6805     7515     7515    8230     8770     

Interest centred on comparing these data with an underlying mean daily energy intake of 7725 kJ This was the recommended daily intake. Departures from this mean in either direction were considered to be of interest. Assuming that the population is normal and the population variance is unknown. An appropriate two-tailed hypothesis test at the 5% level of significance was conducted. The null hypothesis is H₀: m = 7725. What is the degree of freedom df in this problem?

Answer 1