. Construct a 95% CI for the true mean number of days of peak severity of symptoms for those who receive Echinacea treatment. We can use the z distribution to get the critical z value here, since the sample size is sufficiently large. Choose the correct answer below: a. [5.7534, 6.2466] b. [5.8737, 6.3463] c. [3.7000, 8.3000] d. [3.7000, 8.5000] 5. Construct a 95% CI for the true mean number of days of peak severity of symptoms for those who are given a placebo. Choose the correct answer below: a. [3.7000, 8.3000] b. [5.7534, 6.2466] c. [5.8737, 6.3463] d. [3.7000, 8.5000]
In a study designed to test the effectiveness of Echinacea for treating upper repiratory tract infections in
children, 337 children were treated with Echinacea and 370 other children were given a placebo. The
number of days of peak severity of symptoms for the Echinacea treatment group had a mean of 6 days
and a standard deviation of 2.3 days. The numbers of days of peak severity of symptoms for the placebo
group had a mean of 6.1 days and a standard deviation of 2.4 days (based on data from “Efficacy and
Safety of Echinacea in Treating Upper Respiratory Tract Infections in Children,” by Taylor et al., Journal
of the American Medical Associations, Vol. 290, No. 21).
4. Construct a 95% CI for the true mean number of days of peak severity of symptoms for those who
receive Echinacea treatment. We can use the z distribution to get the critical z value here, since the
sample size is sufficiently large.
Choose the correct answer below:
a. [5.7534, 6.2466]
b. [5.8737, 6.3463]
c. [3.7000, 8.3000]
d. [3.7000, 8.5000]
5. Construct a 95% CI for the true mean number of days of peak severity of symptoms for those who are
given a placebo.
Choose the correct answer below:
a. [3.7000, 8.3000]
b. [5.7534, 6.2466]
c. [5.8737, 6.3463]
d. [3.7000, 8.5000]
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