A study designed to evaluate the effect of the herbal remedy Echinacea purpurea randomly assigned healthy children 2 to 11 years old to receive either Echinacea or a placebo. Each time a child had an upper respiratory infection treatment with Echinacea or the placebo was given for the duration of the infection. Parental assessment of the illness severity was measured. The following are the counts from the study: Group Parental assessment Echinacea Placebo Mild 153 170 Moderate 128 157 Severe 48 40 Calculate the x2 statistic Determine whether the results are significant at the alpha=o.oo5 level. Would you advocate for the use of Echinacea in order to reduce the severity of upper respiratory infections? Why or why not? Group Parental assessment Echinacea Placebo Mild 153 170 Moderate 128 157 Severe 48 40 Solution.

1. A study designed to evaluate the effect of the herbal remedy Echinacea purpurea randomly
assigned healthy children 2 to 11 years old to receive either Echinacea or a placebo. Each time a
child had an upper respiratory infection treatment with Echinacea or the placebo was given for
the duration of the infection. Parental assessment of the illness severity was measured. The
following are the counts from the study:
Group
Parental assessment
Echinacea
Placebo
Mild
153
170
Moderate
128
157
Severe
48
40
Calculate the x2 statistic
Determine whether the results are significant at the alpha=o.oo5 level.
Would you advocate for the use of Echinacea in order to reduce the severity of upper respiratory
infections? Why or why not?
Group
Parental assessment
Echinacea
Placebo
Mild
153
170
Moderate
128
157
Severe
48
40

2. Solution