The sample variance is given by which of the following?  

You digress from your career in medicine and become interested in venomous snakes. You want to determine if the LD50 for the Black Mamba, Dendroaspis polylepis, (a very dangerous venomous snake from Africa) is different depending on which fang (right or left) delivers the venom. You carefully(!) take 8 snakes and measure the LD50 from the right and left fangs. You get the following results (in mg/kg):   (Biology comment (not useful for answering the question!): LD50 is the dosage at which the venom kills 50% of the mice it’s tested on (a bit gross, I admit))   Snake # 1 2 3 4 5 6 7 8 s right fang 0.973 1.070 0.719 1.289 0.642 0.889 1.039 0.944 0.946 0.203 left fang 0.235 1.286 1.714 0.054 1.299 0.478 0.920 0.157 0.768 0.623 difference 0.738 -0.216 -0.995 1.235 -0.657 0.411 0.119 0.787 0.178 0.764   You may assume that everything is normally distributed.   What test do you decide to use?    

What is the probability of rolling an 11 with two dice?  

You measure the length of copperheads (the only venomous snake found in the DC area) in cm. You want to know if there is a difference in the length of male and female copperheads. You get the following results, but discover that the data above are not normally distributed.  What is the value of your test statistic (you need to calculate the correct test statistic to use for these data)? males:     64     72    73    74    76    76    77    114 females:  31     54    55    56    57    58    65      67

Which of the following examples best illustrates substitute products or services?

Conditions and trends in the general environment that every company must incorporate into its planning are called path trajectories.

  You calculate a 95% CI and give it as Pr{34 < μ < 48} = 0.95. Why is this wrong?  

In a perfectly competitive market firms produce the same products, earn no economic profits, and accurate, timely information is available to customers and rivals.

Which of the following is not a step in creating a strategy map?

An examination of a company’s financial statements over several years allows the analyst to