Question

a Sports psychologist wants to know if weight training leads to more positive mood. To assess the effects of weight training on the mood, she obtain a sample of 10 people who had never trained and measured their mood. She then instructed them proper weight training techniques and had him follow a training program for one month. At the end of the month the participants mood was measured again. The mood scale was scored such that higher numbers will indicate more positive mood.

1) what ate the one-tailed NULL hypotheses fir this statistical analysis?

a) participant will NOT report less positive mood after weight training and then prior to weight training

b) participant will NOT report more positive mood after weight training then fire to weight training

c) participant will report less positive move after weight training and then prior to weight training

d) participant will report more positive mood after weight training then Peyer to weight training

2) what are one-tailed reseach hyptheses for stayistical analysis?

a) participant will NOT report less positive mood after weight training and then prior to weight training

b) participant will NOT report more positive mood after weight training then fire to weight training

c) participant will report less positive move after weight training and then prior to weight training

d) participant will report more positive mood after weight training then Peyer to weight training

Answer 1

Here we are interested in studying whether weight training will lead to more positive mood. After training mood scores were measured on ordinal scale where higher score indicates more positive mood. Null hypothesis is a hypothesis of no difference , that is there is no difference in mood before and after weight training. We are assuming that null hypothesis is true and testing it for possible rejection . What if null hypothesis is rejected ? What would you conclude ? The statement of your research interest has to be set up as alternative hypothesis . Here we are interested in checking whether mood is more positive after weight training than before training.

1) correct answer is option b (we have considered both mood are same).

Option a is not correct because we are not interested in testing whether it is less or not . Alternative is complementary of null hypothesis.so choose null hypothesis accordingly. Option c and d are totally eliminated ( you can understand from explanation given above)

2) correct option is d ( that is what we are interested in studying)