Question

3a (1 pt). Calculate degrees of freedom and identify the critical t value for a a single-sample t test for a one-tailed test, an N of 19, and an alpha of 0.05.

3b. (1pt). Calculate the 80% confidence interval for the a single-sample t test given the following information: M=60, M=50, s=6.0, and N=12.
3c. (1 pt). Calculate the 95% confidence interval for a paired-sample t test given the following information: Mdifference=17, s=9.7, N=5.

Answer 1

a.For one sample t test degress of freedom=n-1=19-1=18

critical value of t=1.73

b.80% confidence interval for two sided test=,

if mean =50,s=6,n=12

  

  

[47.6385,52.3615]

if mean =60,s=6,n=12

  

  

[57.63847,62.36153]

c.mean difference =17,s=9.7,n=5

95% confidence interval for paired t test=

=[4.94,29.06]

95% confidence interval for paired t test is between 4.94and 29.06