A local pizza parlor claims to deliver all pizzas within 30 minutes. A group of students carried out a study and had 100 pizzas delivered over the course of the semester and found an average delivery time of 45 minutes with a standard deviation of 7 minutes. Which of the following is the correct set of hypotheses for testing if the average delivery time was different than the claim of 30 minutes? A. H0 : xbar = 30 vs HA : xbar not= 30
B. H0 : mu = 45 vs HA: mu not= 45
C. H0: xbar = 45 vs Ha: xbar not= 45
D. H0: mu = 30 vs HA: mu not= 30

What is the rule for reflection across the y axis

Can you make 1000, using only eight 8’s? if you had your choice, would you rather have 5 million dollars, or 1 penny, doubled every day for a month?

The westins and the shermans live in the same city and pay the same sales tax rate, and both families made $14,000 in taxable purchases last year. if the westins made $86,000 and the shermans made $33,000 last year, is the sales tax in their city an example of a regressive tax? yes, because the westins and the shermans both paid the same sales tax rate. b. no, because the shermans paid a higher percentage of their income in sales tax than the westins did. c. no, because the westins and the shermans both paid the same sales tax rate. d. yes, because the shermans paid a higher percentage of their income in sales tax than the westins did.