A) Determine the critical value(s) for a right-tailed test of a population mean at the a =0.10 level of significance with 15 degrees of freedom
b) Determine the critical value(s) for a left-tailed test of a population mean at the a=0.10 level of significance based on a sample size of n=10
c)Determine the critical value(s) for a two-tailed test of a population mean at the a=0.01 level of significance based on a sample size of n=13

a)

The value of and  we are conducting a right tailed test, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=T.INV(1-0.1,14)".And we see that

b)

The value of and  we are conducting a left tailed test, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=T.INV(0.1,9)".And we see that

c)

The value of and  we are conducting a two tailed test, the value of , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.005,12)".And we see that

Step-by-step explanation:

Part a

We need to find the degrees of freedom given by:

The value of and  we are conducting a right tailed test, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=T.INV(1-0.1,14)".And we see that

Part b

We need to find the degrees of freedom given by:

The value of and  we are conducting a left tailed test, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=T.INV(0.1,9)".And we see that

Part c

We need to find the degrees of freedom given by:

The value of and  we are conducting a two tailed test, the value of , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.005,12)".And we see that

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation: