A company that manufactures radios first pays a start-up cost and then spends a certain amount of money to manufacture each radio. If the cost of manufacturing radios is given by the function c(r) - 3.25r+ 225, then which description best interprets the meaning of 3. 25 in this context?
the company's start-up cost
o the profit earned from the sale of one radio
the amount spent to manufacture each radio
o the average number of radios manufactured

On a certain portion of an experiment, a statistical test result yielded a p-value of 0.21. what can you conclude? 2(0.21) = 0.42 < 0.5; the test is not statistically significant. if the null hypothesis is true, one could expect to get a test statistic at least as extreme as that observed 21% of the time, so the test is not statistically significant. 0.21 > 0.05; the test is statistically significant. if the null hypothesis is true, one could expect to get a test statistic at least as extreme as that observed 79% of the time, so the test is not statistically significant. p = 1 - 0.21 = 0.79 > 0.05; the test is statistically significant.