1- What is the critical t -value for a two-tailed test with alpha .05 and 18 deg
ID: 3074505 • Letter: 1
Question
1- What is the critical t-value for a two-tailed test with alpha .05 and 18 degrees of freedom? Write your answer with THREE decimals points !
2- Which of the following examples is not a test with dependent samples.
a- Comparing mean life satisfaction scores for seniors (age 65+) and for middle-aged adults (ages 40-50).
b- Comparing pre- and post-test number of hours of sleep daily.
c- Comparing number of alcoholic drinks consumed in a typical day for pairs of twins.
d- Comparing the number of words read per minute for students before and after a class in speed reading
3- Select the correct formula for the degrees of freedom for a t-test of the differences between two means with independent samples and approximately equal variances.
A- n-1
B- k-1
c- (r-1)(c-1)
D- (n1+n2)-2
Explanation / Answer
1- What is the critical t-value for a two-tailed test with alpha .05 and 18 degrees of freedom?
Answer: The critical value of t for 18 at 5% significance level and for two tailed test is +/-2.101
Q2) Which of the following examples is not a test with dependent samples.
Answer: a- Comparing mean life satisfaction scores for seniors (age 65+) and for middle-aged adults (ages 40-50).
because the group of seniors and middle aged adults are independent to each other.
Q3 ) Select the correct formula for the degrees of freedom for a t-test of the differences between two means with independent samples and approximately equal variances.
Answer: D- (n1+n2)-2
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