# Scientific Method Quiz 1 Period: Name

 Date conversion 02.06.2018 Size 104.75 Kb.
Scientific Method Quiz 1 Period:_____ Name:_____________________________

1. In a study of therapeutic touch, 10 people out of 50 who were not given therapy healed within a week. 20 people out of 50 who were given therapeutic touch healed within a week. Write a null hypothesis for this study and interpret by means of statistics. Show all work.

2. List 3 questions from you baloney detection kit that you would pose for any physical claim.

3. A study was performed on the effect of two different concentrations of fertilizer on plant growth. Column 1 = no fert, column 2 = 1% fertilizer, column 3 = 2 % fertilizer. An analysis of the resulting data (biomass) was performed:
 SUMMARY Groups Count Sum Average Variance Column 1 7 3338 476.8571 6943.143 Column 2 7 6738 962.5714 833.9524 Column 3 7 4437 633.8571 4203.81 ANOVA Source of Variation SS df MS F P-value F crit Between Groups 860114.4 2 430057.2 107.6857 9.66E-11 3.5545611 Within Groups 71885.43 18 3993.635 Total 931999.8 20

1. Identify the control. ___________________________

2. Write a null hypothesis for this experiment.

1. How many replicates (trials) were performed for each experimental group? _______

1. What is the conclusion from this study (and explain you reasoning)?

1. Tcrit = 4.2. Do any of these fertilizer groups have a significant effect? Show all work!!

3. A study was performed on the effect of three different concentrations of fertilizer on plant growth. Column 1 = no fert, column 2 = 1% fertilizer, column 3 = 2 % fertilizer, column 4 = 4% fertilizer. An analysis of the resulting data (biomass) was performed:
 Anova: Single Factor SUMMARY Groups Count Sum Average Variance Column 1 4 90 22.5 1.666667 Column 2 4 94 23.5 0.333333 Column 3 4 82 20.5 1.666667 Column 4 4 87 21.75 0.916667 ANOVA Source of Variation SS df MS F P-value F crit Between Groups 19.1875 3 6.395833 5.581818 0.012429 3.490295 Within Groups 13.75 12 1.145833 Total 32.9375 15

1. Identify the control. ___________________________

2. Write a null hypothesis for this experiment.

1. How many replicates (trials) were performed for each experimental group? _______

1. What is the conclusion from this study (and explain you reasoning)?

1. What further analysis, if any, might be done to locate source of variation or other useful information?