23.6 Practically significant? Brook con-ducted a study for a clothing company to determine if a rewards program caused customers to spend more. Brook found statistically significant results, with a P-value of 0.012. The average amount spent per order before the rewards program was $100, while the average amount spent per order after the rewards program was $223. Are these results practically significant?

  1. (a) No, because the P-value is small.

  2. (b) No, because an average increase of $123 per order is probably too small.

  3. (c) Yes, because the P-value is small.

  4. (d) Yes, because an average increase of $123 per order is more than twice the average amount spent per order before the rewards program.