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

Lab Test 3: Inferential

Quiz Instructions

• 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.

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Question 1      1 pts

Refer data: pricequote.jmp

Using descriptive statistics, what can you conclude?

• 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?

• 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:

• \$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?

• 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?

• 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.

• 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?

• 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,

• 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?

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

Question 10    1 pts

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