# (Solved): WPC 300 : Lab 3: Inferential ...

**Lab Test 3: Inferential**

**Quiz Instructions**

- Start with datafiles:
- Change the file names to: YourFirstName_YourLastName_XXXX.jmp
- Review what we did in the lab.
- You must use JMP to answer the following multiple-choice questions.
**Note: When you are asked to submit a screen capture, you need to make sure that your name is part of the capture.**

Top of Form

**Question 1 1 pts**

Refer data: pricequote.jmp

Using descriptive statistics, what can you conclude?

Group of answer choices

- Variation in Mary’s price is higher than Barry’s price
- Barry’s average price is higher than Mary’s average price
- Mary’s pricing is more reasonable than that of Barry.
- Barry’s average price is lower than Mary’s average price

**Question 2 1 pts**

Use a box plot to compare overall all difference in price quoted by Barry and Mary. What is your conclusion?

Group of answer choices

- Barry’s price has a larger spread in the sample
- Barry’s price has larger spread in the population
- Mary’s price has larger spread in the population
- Mary’s price has a larger spread in the sample

**Question 3 1 pts**

Interquartile range in Mary’s price quote is:

Group of answer choices

- $133 to $114
- $114 to $105
- $133 to $97
- $125 to $105

**Question 4 1 pts**

Based on a two-tailed statistical test to infer the population, what is your conclusion?

Group of answer choices

- Barry’s average price is significantly different from Mary’s average price
- Nothing can be inferred as the sample size is really small
- Mary’s average price is significantly higher than Barry’s average price
- Barry’s average price is similar to Mary’s average price

**Question 5 1 pts**

What is the null hypothesis for the test you performed in Q4?

Group of answer choices

- Barry’s average price is less than Mary’s average price
- Barry’s average price is at least $9 higher than Mary’s average price
- Barry’s average price is more than Mary’s average price
- There is no difference between Barry’s and Mary’s average price.

**Question 6 1 pts**

The conclusion inferred in Q4 is supported by t-test where the obtained p-value is.

Group of answer choices

- More than 0.0284
- Less than 0.05
- Equal to 2.52
- Less than 0.986

**Question 7 1 pts**

Refer data:SalaryANOVA.jmp.

What is the null hypothesis of the ANOVA analysis of Salary data across majors?

Group of answer choices

- Average salaries of all college majors are very different
- None of the other answers is correct
- Average salaries of all college majors are the same
- Average salaries of all college majors are slightly different

**Question 8 1 pts**

Based on the results obtained from the ANOVA analysis of Salary data across majors,

Group of answer choices

- You accept the alternative hypothesis
- You could not reject the null hypothesis
- You accept the null hypothesis
- You reject the null hypothesis

**Question 9 1 pts**

Based on the connecting letter report, salaries of which college majors are significantly different?

Group of answer choices

- Social science and music
- Social science and special education
- Language and music
- Science and music

**Question 10 1 pts**

Support your answer for Q9 by providing an appropriate screenshot.