The average annual salary of the employees of a company in the year 2005 was $70,000. it increased by the same factor each year and in 2006 the average annual salary was $82,000. let f(x) represent the average annual salary in thousand dollars after x years since the 2005. which of the following best represents the relationship between x and f(x)? f(x)=70(1.17)^x f(x)=82(1.17)^x f(x)=70(2.2)^x f(x)=82(2.2)^x

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