Complete parts (a) through (c) below.

(a) Determine the critical value(s) for a right-tailed test of a population mean at the

alpha equals=0.01 level of significance with 10 degrees of freedom.

(b) Determine the critical value(s) for a left-tailed test of a population mean at the

alpha equals=0.10 level of significance based on a sample size of

n equals=20.

(c) Determine the critical value(s) for a two-tailed test of a population mean at the

alpha equals=0.10 level of significance based on a sample size of

n equals=18.

Part 1

(a)

t Subscript crittcritequals=

plus or minus

enter your response here

(Round to three decimal places as needed.)