**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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