Parts (a) through (d) below provide additional results for Case Study 21.1. For each of the parts, compute an approximate 95% confidence interval for the difference in mean symptom scores between the placebo and calcium-treated conditions for the symptom listed. In each case, the results given are mean 6 standard deviation. There were 228 participants in the placebo group and 212 in the calcium- treated group.
a. Mood swings: placebo = 0.70 ± 0.75; calcium = 0.50 ± 0.58
b. Crying spells: placebo = 0.37 ± 0.57; calcium = 0.23 ± 0.40
c. Aches and pains: placebo = 0.49 ± 0.60; calcium = 0.31 ± 0.49
d. Craving sweets or salts: placebo = 0.60 ± 0.78; calcium = 0.43 ± 0.64