STAT/167 Version 2 Distribution, Hypothesis Testing, and Error Worksheet University of Phoenix Material Tiffany Bush
This document is a worksheet on distribution, hypothesis testing, and error, likely used in a statistics course at the University of Phoenix.
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Distribution, Hypothesis Testing, and Error Worksheet
STAT/167 Version 2
1
Adapted from Biostatistics for the Biological and Health Sciences faculty materials with permission from Pearson Addison-Wesley.
STAT/167 Version 2 Distribution, Hypothesis Testing, and Error Worksheet
University of Phoenix Material Tiffany Bush
Distribution, Hypothesis Testing, and Error Worksheet
Answer the following questions. For questions requiring material from Statdisk, make sure to turn
labels on, take a screen capture (CTRL-Print Screen on most Windows-based computers), and
paste the image into the worksheet. Crop the image as appropriate.
1. Describe a normal distribution in no more than 100 words (0.5 point).
A normal distribution is a continuous random variable distribution which has the mean
and median same and the standard deviations are apart from the mean in the
probabilities that go with the empirical rule. The normal distribution is continuous, and
has only two parameters - mean and variance. The mean can be any positive number
and variance can be any positive number (can't be negative - the mean and variance),
so there are an infinite number of normal distributions. The shape of the distribution is
symmetrical and bell-shaped (bell curve).
Use this information to answer questions 2-4. Following a brushfire, a forester takes core
samples from the ten surviving Bigcone Douglas-fir trees in a test plot within the burn area,
and a dendrochronologist determines the age of the source trees to be as follows (in years):
15 38 48 67 81 83 94 102 135 167
2. Construct a normal quantile plot in Statdisk, show the regression line, and paste the image
into your response. Based on the normal quantile plot, does the data above appear to come
from a population of Bigcone Douglas-fir tree ages that has a normal distribution? Explain
(0.5 point).
STAT/167 Version 2
1
Adapted from Biostatistics for the Biological and Health Sciences faculty materials with permission from Pearson Addison-Wesley.
STAT/167 Version 2 Distribution, Hypothesis Testing, and Error Worksheet
University of Phoenix Material Tiffany Bush
Distribution, Hypothesis Testing, and Error Worksheet
Answer the following questions. For questions requiring material from Statdisk, make sure to turn
labels on, take a screen capture (CTRL-Print Screen on most Windows-based computers), and
paste the image into the worksheet. Crop the image as appropriate.
1. Describe a normal distribution in no more than 100 words (0.5 point).
A normal distribution is a continuous random variable distribution which has the mean
and median same and the standard deviations are apart from the mean in the
probabilities that go with the empirical rule. The normal distribution is continuous, and
has only two parameters - mean and variance. The mean can be any positive number
and variance can be any positive number (can't be negative - the mean and variance),
so there are an infinite number of normal distributions. The shape of the distribution is
symmetrical and bell-shaped (bell curve).
Use this information to answer questions 2-4. Following a brushfire, a forester takes core
samples from the ten surviving Bigcone Douglas-fir trees in a test plot within the burn area,
and a dendrochronologist determines the age of the source trees to be as follows (in years):
15 38 48 67 81 83 94 102 135 167
2. Construct a normal quantile plot in Statdisk, show the regression line, and paste the image
into your response. Based on the normal quantile plot, does the data above appear to come
from a population of Bigcone Douglas-fir tree ages that has a normal distribution? Explain
(0.5 point).
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Document Details
University
University of Phoenix
Subject
Statistics