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# (Solved): WPC 300 : HOA 3: Inferential Statistics...

HOA 3: Inferential Statistics

Question 1     3 pts

What statistical test would perform to test your hypothesis: average time to deliver pizza, once the order is placed, is greater than 25 minutes in the population.

• T-test
• No test is necessary
• ANOVA
• Z-test

Question 2    3 pts

The null hypothesis for the statistical test for Question 1 is:

• None of the other answers are correct
• Mean delivery time is less than 0.05
• Mean delivery time is more than 25 minutes
• Mean delivery time is less than or equal to 25 minutes

Question 3       3 pts

Based on the sample, is there sufficient evidence in the data to conclude that the population average time to deliver a pizza, once the order is placed, is greater than 25 minutes? Based on the statistical analysis (with margin of error = 5%) what is your conclusion? [Save the script to the data file]

• We accept the null hypothesis and hence conclude that the delivery time is more than 25 min.
• We could not conclude anything
• We reject the null hypothesis, and hence conclude that the delivery time is more than 25 min
• We could not reject the null hypothesis, and hence conclude the mean delivery time is less than 25 min

Question 4        3 pts

Submit a screenshot of an appropriate analysis table to support your answer in Question 3.

Question 5      3 pts

Given the sample data, what kind of statistical test would you perform in order to find out if the days of the week have an effect on the mean delivery time?

• Z-test
• T-test
• Descriptive
• ANOVA

Question 6     3 pts

Based on executing the test in Question 5, what would you conclude, given a margin of error of 5%?

• We reject the null hypothesis; the mean delivery time is different at least on one of the days of the week
• We reject the null hypothesis; the mean delivery time is different for every day of the week
• We accept the null hypothesis; the mean delivery time is not different for different days of the week
• We could not reject the null hypothesis; the mean delivery time is not different for different days of the week

Question 7     3 pts

Execute an appropriate follow-up test to determine on which days of the week the mean delivery time is different.  What is your conclusion? [Save the script to the data file]

• Mean delivery times on Friday and Thursday are different
• Mean delivery times on Saturday and Thursday are different
• Mean delivery times on Tuesday and Wednesday are different
• All of the answers are correct

Question 8      3 pts

Execute an appropriate statistical test, with a margin of error of 5%, to determine if hour of the day has an effect on the mean delivery time.  What is your conclusion? [Save the script to the data file]

• Nothing can be concluded as additional information is necessary
• Mean delivery time is different on the 9th and 10th hour of the day
• Mean delivery time does not vary by the hour of the day
• Mean delivery time is different at every hour of the day

Question 9      3 pts

Based on your analysis, what action would you recommend to the owner of Pizza Perk to improve their operation?

• The owner should collect additional delivery time data to make better recommendation on pizza delivery operation
• The owner should consider hiring you full time
• The owner should consider hiring more staff on Friday and Saturday to reduce wait time on those days.
• The owner should focus on reducing the mean delivery time to 20 minutes.

Question 10   3 pts

Submit the JMP data file with the saved scripts for all the analyses to answer  questions from this assignment.

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