Author:
Joyce Buda

http://theperfecthomework.com/below-are-five-5-separate-distributions-a-calculate-the-range/

Problem 1

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)

Problem 2

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

Problem 3

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

Problem 4

Tutorial