Scientific Method Quiz 1 Period: Name



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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?


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