HW 9 MC Questions 1) A sample of n=4 scores has SS=48. What is the estimated standard error for the sample mean? a. 1 b. 2 c. 4 d. 16 2) A sample with a mean of M=40 and a variance of s2=20 has an estimated standard error of 2 points. How many scores are there in the sample? a. 4 b. 5 c. 10 d. 25 3) Which set of sample characteristics is most likely to produce a significant t statistic? a. a large sample size and a small sample variance b. a large sample size and a large sample variance c. a small sample size and a small sample variance d. a small sample size and a large sample variance 4) A sample is selected from a population with =80, and a treatment is administered to the sample. If the sample variance is s2=20, which set of sample characteristics is most likely to lead to a decision that there is a significant treatment effect? a. M=85 for a sample of n=25 b. M=85 for a sample of n=100 c. M=90 for a sample of n=25 d. M=90 for a sample of n=100 5) What is the sample variance and the estimated standard error for a sample of n=9 scores with SS=72? a. s2=9 and sM=3 b. s2=9 and sM=1 c. s2=3 and sM=3 d. s2=3 and sM=1 6) As sample size increases ________________________. a. the value of df also increases b. the t distribution becomes more like a normal distribution c. the critical values of t move closer to zero d. All of the other options are true as sample size increases 7) The results of a hypothesis test are reported as follows: t(29)=2.70, p < .05. Based on this report, how many individuals were in the sample? a. 28 b. 29 c. 30 d. cannot be determined from the information provided 8) A sample is selected from a population with =80 and a treatment is administered to the sample. After treatment, the sample mean is M=66 with a sample variance of s2=00. Based on this information, the size of the treatment effect, as measured by Cohen's d, is ___________________. a. d=0.06 b. d=0.60 c. d=0.66 d. Cohen's d cannot be computed without knowing the sample size