**QNT 275 Week 5 Practice Set Latest Version 2017**

*University of Phoenix Material*

Practice Set 5

# Practice Set 5

1. This distribution has only one parameter. The curve is skewed to the right for small *df *and

becomes symmetric for large *df*. The entire distribution curve lies to the right of the vertical

axis. The distribution assumes nonnegative values only

- t distribution
- Normal distribution
- Chi-square distribution
- Linear regression.

2. Find the value of x2 for 12 degrees of freedom and an area of .025 in the right tail of the chi-

square distribution curve. What is the value of chi-square? Round to three decimal places

3. Determine the value of x2 for 14 degrees of freedom and an area of .10 in the left tail of the

chi-square distribution curve. What is the value of chi-square? Round to three decimal places

4. Determine the value of x2 for 23 degrees of freedom and an area of .990 in the left tail of the

chi-square distribution curve. What is the value of chi-square? Round to three decimal places.

5. Α ____________ compares the observed frequencies from a multinomial experiment with

expected frequencies derived from a certain pattern or theoretical distribution. The test

evaluates how well the observed frequencies fit the expected frequencies.

- Goodness-of-fit test
- Chi-square test
- Linear regression

6. The __________ are the frequencies obtained from the performance of a

multinomial experiment. The expected frequencies are the frequencies that we expect to obtain

if the null hypothesis is true.

- Observed frequencies
- Expected frequencies
- Fluctuating frequencies

7. The expected frequency of a category is given by Ε = np where n is the sample size and p is the

probability that an element belongs to that category if the null hypothesis is true. The

________ for a goodness–of–fit test are k – 1, where k denotes the number of possible

outcomes (or categories) for the experiment.

- Number of observations
- Degrees of freedom
- Total population

- This model includes only two variables, one independent and one dependent, is called a _____
__1________. The**___**is the one being explained, and the__2______**___**is the one used to explain the variation in the dependent variable. Select the correct letter that would make the sentence true.__3_____

1. Select a letter from the list to make this statement true.

2. Select a letter from the list to make this statement true.

3. Select a letter from the list to make this statement true.

- Linear model
- Qualitative variable
- Multivariate analysis of variance
- Independent variable
- Simple regression model
- One-way Analysis of Variance
- Dependent variable
- Quantitative variable

9. A population data set produced the following information.

N=460, ∑x=3920, ∑y=2650, ∑xy=26,570, ∑x2=48,530

Find the population regression line. Round to three decimal places. Use the format as an example when submitting your equation 456.123 + 789.123x

10. The following information is obtained from a sample data set.

n=12, ∑x=66, ∑y=588, ∑xy=2244, ∑x2=396

Find the estimated regression line Use this format as an example when submitting your equation 123 – 45x

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