statisticPsY315.docx - a u03bcM =_73 b u03c3M =_20 c The...

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a. μM = ___73_______. b. σM = ____20______. c. The shape of the comparison distribution is ___rectangular_______. d. If the sample mean is 75, the lower limit for the 99% confidence interval is ____69.75______. e. If the sample mean is 75, the upper limit for the 99% confidence interval is ____80.25______. f. If the sample mean is 75, the lower limit for the 95% confidence interval is _____71.03_____. g. If the sample mean is 75, the upper limit for the 95% confidence interval is ____78.97______ 1. variance μM =(standard deviation) 2 =20 2 =400 2. standard error of the mean σM = 75-73 =2 3. the shape of comparison is even 4. 98.5 5. 99.5 6. 94.5 7. 95 I need the standard deviation of the 20 scores unless I can assume it was 10. Ho: means were the same Ha: they weren't alpha=0.05, P{reject Ho|Ho true} critical value |z|>1.96 calculation z=(78-75)/10/sqrt(20) =3*sqrt(20)/10=1.34 Fail to reject Ho; insufficient evidence to say the scores were >75.