A convenience store sell pre-paid mobile phones. It purchases them for $12 each and uses a mark up rate of 250%. a. The markup rate is the constant of proportionality in the equation y= kx. Write an equation that can be used to find the amount of markup on the cost x of a phone

b. Use the equation to calculate the markup amount. What is the retail price of a phone?

c. Next week the store is going to reduce the price to $31.50. Calculate what percent the sale price is of the retail price.

d. Based on your answer to part C, what is an equation in the form y = kx that relates the sale price to the retail price x?

Two researchers are attempting to create a new psychotherapy protocol that more reduces panic attacks. they believe that they have succeeded and are now in the clinical trial period of their protocol's development. they are working with several cohort groups, some of which have been through the new protocol, while others have done the standard protocol currently recommended. if these researchers are interested in evaluating the difference in the percentage of test subjects who successfully decreased their panic attacks in 2 months on the new protocol versus the percentage of test subjects who successfully decreased their panic attacks in 2 months with the traditional protocol, which of the following statistical tests would be most appropriate? a. analysis of variance (anova) b. correlation c. chi-square test d. paired t-test e. independent t-test