One sample has n = 6, while another has n = 10 and together they produce a poole

Question

One sample has n = 6, while another has n = 10 and together they produce a pooled variance of 60. Based on this information, the estimated standard error for the sample mean difference would be__. a. 6 b. 10 c. 4 d. 16 An independent-measures research study uses two samples, each with n = 10, to compare two treatments. If the results are evaluated with a t statistic using a two-tailed test with alpha = 05, then the critical region would have boundaries of__. a. t = plusminus 2.262 b. t = plusminus 2.10l c. t = plusminus 2.093 d. t = plusminus 2.074 A researcher reports t(20) = 1.78 for an independent-measures experiment. How many subjects participated in the entire experiment? a.20 b.21 c.22 d.8 An independent-measures experiment uses two samples with n = 10 in each to compare two experimental treatments. The t statistic from this experiment will have degrees of freedom equal to__. a. 8 b. 9 c. 18 d. 19

Explanation / Answer

7) estimated std error =(60*(1/10+1/6))1/2 =4

option c

8)

here degree of freedom =n1+n2-2=18

therefore critical value at 0.05 level of signfiicance =-/+2.101 ; option B

9)as degree of freedom =20

therefore number of participants =20+2 =22 ; option C

10)degree of freedom =n1+n2-2 =18

option C

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