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A researcher investigated the effects of green and red light on the growth rate of bean plants.ﾃつﾃつThe...

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Statistics

A researcher investigated the effectsof green and red light on the growth rate of beanplants.ﾃつﾃつThe table below summarizes the heights (ininches) of bean plants from soil to first branchingstem.ﾃつﾃつ

Light

Sample Mean

Sample Standard Deviation

Sample Size

Red

8.36

1.50

17

Green

8.94

2.78

25

(A ﾃ｢竄ｬ窶 10 pts.)ﾃつﾃつUse thePooled two-sample t-procedure to construct the 95% confidenceinterval for the difference in mean height for bean plants exposedto these two colors of light.ﾃつﾃつ(You do not need tointerpret the confidence interval.)

(B ﾃ｢竄ｬ窶 8 pts.)ﾃつﾃつSuppose thatyou wish to address the question of whether mean height differs forbean plants exposed to these two colors of light.ﾃつﾃつStatethe null hypothesis and the alternative hypothesis, usingappropriate notation. Clearly identify what each symbolrepresents.ﾃつﾃつDo not attempt to conduct thetest.

Answer & Explanation Solved by verified expert
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a Degree of freedom DF n1n22 40 tcritical value t 2 20211 excel formula tinv2df pooled std dev Sp n1 1s1 n2 1s2n1n22 23531 std error SE Sp1n11n2 07397    See Answer
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