( SHOW ALL WORK PLEASE) *** You work for a pharmaceutical company which is testi
ID: 3322534 • Letter: #
Question
( SHOW ALL WORK PLEASE) ***
You work for a pharmaceutical company which is testing a cure for the common cold. Each group is composed of independent groups, randomly assigned to treatment by you. The four groups differ in the number of days they have taken the drug. The numbers below are the number of sniffles in a six-month period.
0 Days 1 Day 4 Days 6 Days
4 16 12 6
2 4 4 12
3 11 12 9
4 9 11 15
2 3 7 14
Since you are interested in which soft drink did best, which of the following tests should you perform:
a. t-test
b. ANOVA
c. correlation
d. regression
e. multiple regression
What is the independent variable in this design:
What is the dependent variables in this design:
Based on above data, complete the following summary table:
SS df ms
Between ____ ____ ____
Within ____ ____ ____
TOTAL ____ ____ ____
What is the F for this test?
What is the critical value for F?
Is the F significant?
What should be done next?
Explanation / Answer
a) we need to test several means Hence we use ANOVA one way
from Excel
F cal=2.9433
P value=0.0647
since P> 0.05, we can not reject the H0. Hence claim is not significant
Anova: Single Factor SUMMARY Groups Count Sum Average Variance o days 5 15 3 1 1 day 5 43 8.6 28.3 4 days 5 46 9.2 12.7 6 days 5 46 9.2 19.7 ANOVA Source of Variation SS df MS F P-value F crit Between Groups 136.2 3 45.4 2.943274 0.064702 3.238872 Within Groups 246.8 16 15.425 Total 383 19Related Questions
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