Below are five (5)separate distributions.
a- Calculate the Range
b- Use the range to calculate the standard deviation
c- Calculate the standard deviation (and show any difference)
Two (2) students tookthe same statistics test.
Convert their scoresto percentiles and plot on a chart.
You will need thez-table in the back of the text (or internet search).
Math Test Results
X = 73.0
s = 8.0
John scores 79 on thetest
Mary scored 68 on thetest
I have finishedanalyzing the data from a recent study.
There are 25 subjectsin the sample
The mean of thesample is 75
The standarddeviation is 4.7
Please answer thefollowing:
a- What is the standarderror o the mean for these data?
b- What are the 95% and 99%confidence intervals
c- What is the probabilityof obtaining by chance the following:
i - a mean less than 72
ii- a mean less than 74
iii- a mean greater than 76
iv- a mean greater than 78