Suppose you want to know if the average time it takes to complete a certain task is significantly different from a target time of 30 minutes. You randomly select a sample of 20 participants and time how long it takes them to complete the task. The data is as follows: 26; 29; 31; 33; 27; 28; 30; 31; 32; 29; 25; 28; 34; 30; 31; 27; 29; 33; 28; 30 a) [6 points] What assumptions you need to compute a t confidence interval? Can you built a Z confidence interval, Explain your answer? b) [3 points] Provide a point estimate of the population mean.  c) [3points] Regardless of whether or not you think the assumptions are satisfied, construct a 95% confidence interval. Interpret the interval. d) [12 points] Is there sufficient evidence that mean time has increased since ? (1) Write down the null and alternative hypotheses; (2) compute the test statistic; (3) compute the p-value; (4) draw a conclusion.

[Red ] The________ for the American Red Cross is “to prevent and alleviate human suffering in the face of emergencies by mobilizing the power of volunteers and the generosity of donors.”

[geographical] Manufacturers or even wholesalers make geographical adjustments to list or quoted prices to reflect

[dumping] In international trade, dumping refers to

[Elijah]  Elijah runs a beer funnel business, where he sells different colored funnels to businesses like Party City and Spencer’s. He’s trying to figure out how he wants to price his funnels. Elijah invested $150,000 into the business, expecting a 15% ROI. He produced 14,000 standard units, with each costing $0.50 in variable costs. At this moment, his fixed costs are about $100,000. How much should Elijah charge per funnels if he uses target ROI pricing?

You have a 9-year-old male that comes to your clinic with concerns of his ADHD medication is not lasting long enough. He is currently taking methylphenidate extended-release capsule (Ritalin LA) and his family is finding it is wearing off at 1 pm. The family would like a medication that lasts longer. The find when the methylphenidate extended release (Ritalin LA) is in his system it works well without side effects. You discuss with the family: 

[Sam] Sarah receives an email that appears to be from her bank, asking her to verify her account information and telling her that her account will be suspended if she doesn’t. Unfortunately, the link in the email goes to a copycat website that steals her credentials. Sam, on the other hand, is using his phone to purchase concert tickets while sitting in Turlington Plaza. He believes that he is connected to UF’s Eduroam wifi network, but instead allows an unsecured connection to Edurome which happens to be an access point set up by a hacker also sitting in the plaza. All of his data (unencrypted) are sniffed by the hacker. In this scenario, what two types of security exploits are Sarah and Sam, respectively, falling for?

[Amazon]  In a controversial move, Amazon.com was caught manipulating its prices. Avid DVD buyers, buying in quantity for resale, found that the online retailer was offering different customers different prices for the same DVD, and complained loudly. Company officials admitted that the company was trying to see how much it could charge for an item before buyers balked. Amazon was caught attempting

Suppose the tax rate on the first $20,000 of income is 0%; 8% on the next $20,000 earned; and 20% on any additional income earned.   What does a person earning $45,000 pay in income tax? [ans1]   What is the average tax rate for this person? Round your answer to two decimals. [ans2]

High income countries are classified as having a GDP per capita that is greater than