Hypothesis Testing in Statistic Assignment Questions and Answers Help

Hypothesis Testing in Statistic

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Assignment Details:

Words: 1000

Hypothesis Testing: Questions and Answers

Write your answers after each question

Define the following terms: 1 mark each

A Hypothesis
A Null Hypothesis
The critical value
The test statistic

Questions to answer 2 marks each except for B and H

What do we call either 95% or 99% when we conduct a hypothesis test?
What do we look up z tables or t tables to find? 1 mark
If the answer to the test statistic is > the critical value, do we accept or reject the null hypothesis?
When is a t test used instead of a z test formula to find the test statistic?
When do we us the t formulae to calculate the test statistic instead of the z formula?
What is a type 2 error, and how can it be fixed, or can the error be not made?
What do you want to find out when you use a two-tail hypothesis test? 1 mark

Regression: Questions and Answers

Write your answers after each question

Define the following terms: 1 mark each

Correlation
Quantitative variable
A positive relationship between X and Y
An error term  in a regression equation

Questions the following questions

The following is the printout from a regression model which is testing the relationship between the number of fish meals per week and the amount of mercury in the blood of the people who have eaten the fish.

This is information from the same regression Fish eating and mercury in blood

1. What does R square or R2 show in general?

2. What value of R square is ideal?

3. What does the value here above tell us about what percentage of the Y variable is explained by the X variable?

4. What would we need to do to increase the value of the R square? Add more observations or increase the number of X variables?

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