Find out what number the X represents 7x -9 = 5
1 answer:
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Answer:
a)
b)
c)
Step-by-step explanation:
Part a
represent the significance level
df =15
Since is a right tailed test the critical value is given by:
And we can use the following excel code to find it: "=T.INV(0.9,15)"
Part b
represent the significance level
n=20 represent the sample size
First we need to find the degrees of freedom given by:
Since is a left tailed test the critical value is given by:
And we can use the following excel code to find it: "=T.INV(0.1,19)"
Part c
represent the significance level
n=18 represent the sample size
First we need to find the degrees of freedom given by:
The value of and
Since is a two tailed tailed we have two critical values is given by:
And we can use the following excel code to find it: "=T.INV(0.025,17)"