Question

Define type 1error

What is the difference between t- Test, and z test

Answer #1

Error Table | Null Hypothesis is | ||

True | False | ||

Decision about Null Hypothesis is, | Don't Reject | Correct inference (true negative) (probability = 1− |
Type II error (false negative) (probability = β) |

Reject | Type I error (false positive) (probability = |
Correct inference (true positive) (probability = 1− |

Both Z test and t test are assumed to have a normally distributed data, z test is used when there large sample size (n>30), while t test is used when there is small sample size (n<=30).

Z test is mostly used when the standard deviation is known.

What is the difference between a t test of independent means and
a t test of dependent means? Provide examples of when you would use
each type of t test.

In your own words, tell me the difference between using the z
test and the t test for testing the difference between 2 means.

What is the difference between Wild Type, Type A and Type T
yeasts?

Define what a scope of inference is for statistics.
What is the difference between a t-value and a sample
statistic.
Thank you.

What is the difference between a t test for independent
samples and a t test for related (dependent) samples?
Give an example of when you would use each?

1. Which of the following is a major difference between a
hypothesis test with a t statistic and the test with a z-score?
a.
You must know the population standard deviation for the z-score
but not for the t statistic.
b.
You use the normal distribution table to find critical values
for t but not for z.
c.
You must know the population median for the z-score but not for
the t statistic.
d.
There are no major differences between...

What is the difference between a One sample
t-test, Unpooled t-test, Pooled
t-test, Paired t-test, and Mann
Whitney U test? How do you know when to use each test?

4. What is the difference between “z” and “t” statistics? When
do we use z-table, and when do we use t-table?

discuss the differences between a one-sample z-test, one-sample
t-test, the independent samples t-test and the dependent samples
t-test. Specifically, under what circumstances would you conduct
each test and what type of information comes from a known/defined
population versus your sample data?

Define stock dividends and cash dividends. What is the
difference between the two and which type of dividends do you think
is best? If you were considering purchasing stock in a company,
would either of these practices make a difference in your choice of
which stock to purchase?

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