Construct the confidence interval for the population mean c= 0.95. X with a line on top =16.4 standard D= 4.0. And n= 70 A 95% confidence interval for the mean is ( , ). Round 2 1 Decimal Place if needed
Construct the confidence interval for the population
c= 0.95. X with a line on top =16.4
standard D= 4.0. And n= 70
A 95% confidence interval for the mean is ( , ). Round 2 1 Decimal Place if needed
Obtain the 95% confidence interval for the population mean.
The 95% confidence interval for the population mean is obtained below as follows:
The formula for the Confidence interval for mean is:
Obtain the critical value.
The degrees of freedom:
From the information, given that n=70.
Use EXCEL Procedure for finding the critical value of t.
Follow the instruction to obtain the critical value of t:
- Open EXCEL
- Go to Formula bar.
- In formula bar enter the function as“=TINV”
- Enter the probability as 0.05.
- Enter the degrees of freedom as 69.
- Click enter.
EXCEL output:
From the EXCEL output, the critical value of t at the 0.05 level of significance with the 69 degrees of freedom is 1.99495
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