Statistics Exam 2 Study Guide – Probability,
Hypothesis Testing & Regression
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, Statistics Exam 2 Study Guide – Probability,
Hypothesis Testing & Regression
1. The Standard Normal Curve is defined by: u=0, o=1
2. Mathematically, every t-distribution is centered at zero, bell-shaped
with a degrees of freedom (df) curve, has fatter tails than a
value less than infinity Standard Normal Curve,
can be used to correct for potential
inaccuracy in a standard error statistic.
3. A college professor is interested in If the population mean for IQ on the old
the test
possibility that, on average, teenagers, to- among teenagers today is 100,
there was an
day, have a higher IQ (intelligence 11% probability of observing a mean IQ
quo- tient) than their parents had in the sample that falls 7 points or
at the same farther away from
age. To investigate this possibility, the
pro- 100. fessor plans to administer an
IQ test from 1988 to teenagers, one that
was likely
used when their parents were in their
ear- ly teens. When that old IQ test
was first ad- ministered 30 years ago,
it was designed so that the
population mean was "100".
Say that, after conducting this study
on a sample of N = 50 teenagers, the
professor observed a sample mean
for IQ of and, after applying a One-
Sample t-Test to the data, he obtains
a p-value of p = 0.11 = 11%. This p-
value can be interpreted to mean:
4. Total cholesterol is an example of a vari- it utilizes numerical values that
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10
Hypothesis Testing & Regression
1/
10
, Statistics Exam 2 Study Guide – Probability,
Hypothesis Testing & Regression
1. The Standard Normal Curve is defined by: u=0, o=1
2. Mathematically, every t-distribution is centered at zero, bell-shaped
with a degrees of freedom (df) curve, has fatter tails than a
value less than infinity Standard Normal Curve,
can be used to correct for potential
inaccuracy in a standard error statistic.
3. A college professor is interested in If the population mean for IQ on the old
the test
possibility that, on average, teenagers, to- among teenagers today is 100,
there was an
day, have a higher IQ (intelligence 11% probability of observing a mean IQ
quo- tient) than their parents had in the sample that falls 7 points or
at the same farther away from
age. To investigate this possibility, the
pro- 100. fessor plans to administer an
IQ test from 1988 to teenagers, one that
was likely
used when their parents were in their
ear- ly teens. When that old IQ test
was first ad- ministered 30 years ago,
it was designed so that the
population mean was "100".
Say that, after conducting this study
on a sample of N = 50 teenagers, the
professor observed a sample mean
for IQ of and, after applying a One-
Sample t-Test to the data, he obtains
a p-value of p = 0.11 = 11%. This p-
value can be interpreted to mean:
4. Total cholesterol is an example of a vari- it utilizes numerical values that
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10
