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(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.

 



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