It is believed that women's weight after pregnancy is less that before pregnancy. Using a sampling where each of a randomly selected group of women is weighed before & after pregnancy, what shud u use to test this claim?

To test this claim, you would use a paired t-test. This test is used to compare two means from samples from the same population and assess whether the two means are significantly different from one another. To set up the test, you would need the data for the weights of each woman before and after pregnancy. You would then calculate the differences between the weights before and after pregnancy for each woman, and then calculate the mean of the differences. Finally, you would use a t-test to assess the significance of the difference. If the difference is found to be significant, you can conclude that the average weight after pregnancy is significantly lower than the average weight before pregnancy.