Acercan company's main source of income is a mobile ago. The function h models the company's annual profit in millions of dollars, as a function of the price the charge for the app lincolars which of these statements are true choose all that apply A: If the company doesn't charge for the app, they make 0 profit B: If the Company doesn't charge the app, they lose about 10 million dollars. C: To make greatest profit, the company should charge 7 dollars for the app D: To make the greatest profit, the company should charge 40 dollars for the app

Acell phone company offers two plans to its subscribers. at the time new subscribers sign up, they are asked to provide some demographic information. the mean yearly income for a sample of 40 subscribers to plan a is $45,000 with a standard deviation of $9,200. for a sample of 25 subscribers to plan b, the mean income is $64,300 with a standard deviation of $7,100. at the 0.025 significance level, is it reasonable to conclude the mean income of those selecting plan b is larger? assume unequal population standard deviations. hint: for the calculations, assume the plan a as the first sample. what is the decision rule? (negative amount should be indicated by a minus sign. round your answer to 3 decimal places.) compute the value of the test statistic. (negative amount should be indicated by a minus sign. round your answer to 2 decimal places.) what is your decision regarding h0 ? reject h0 fail to reject h0 compute the p-value. less than 0.01 between 0.01 and 0.025 between 0.025 and 0.05 between 0.05 and 0.10 greater than 0.10