Question

suppose a 12 - confidence interval for the mean weight change (kg) for some group of people is to be calculated. use the table to determine the t - critical value for a 90% confidence interval. the table has week number (1, 2, 3, 4, 5) and weight change (kg) (-1.5, 2.2, -0.8, -1.8, -0.8). the multiple - choice options are 0.95, -2.3, -0.45, 0.58.

Explanation:

Step1: Calculate sum of weight changes

$\sum (-1.5 + 2.2 -0.8 -1.6 -0.6) = -2.3$

Step2: Find mean (average)

$\text{Mean} = \frac{\text{Total weight change}}{\text{Number of weeks}} = \frac{-2.3}{5} = -0.46$

Answer:

-0.46