3 students apply to a PhD program.  The program rejects 25% of all applicants.  Students are accepted and rejected independently of each other.  Let the random variable X represent the number of the 3 students who get rejected into the PhD Program. (Hint: Binomial distribution with n=3, P=25%)   What is the standard deviation of the random variable?  (round your answer to 4 decimal places)

If a researcher only contacts students who take their class to be a part of their sample, what type of sampling has occurred?

Five hundred women are enrolled in a study to evaluate the accuracy of a test for pregnancy. 200 of the women were actually pregnant. 170 of the pregnant women had a positive test as did 140 of the women who were not pregnant. What is the probability (i.e., specificity) that a woman tested negative on a test given that she is not pregnant? Test                         Pregnant? Yes No Total + 170 140 310 – 30 160 190 Total 200 300 500

Based on the following research question: Does playing video games make someone more likely to pursue a degree in a STEM field?   The variable do you play video games [answer1] The variable pursuing a degree in a STEM field [answer2]

Select the term that best fits this definition: This term equals this:

Based on the following research question: Do people who on average eat at least 8 servings of fruit per day have a lower likelihood of having diabetes than those who on average eat at at most 4 servings of fruit per day?   The variable average number of servings of fruit eaten per day is the [answer1] The variable having diabetes is the [answer2]

It is known that people in the USA spend on average 18 hours a day using electronic devices with a standard deviation of 5.8 hours. This data follows a normal distribution. What is the probability someone spends more than 20 hours using electronic devices a day? (round your answer to 4 decimals)

Select the term that best fits this definition: As n increases the shape of the distribution will look more and more like a normal distribution

If a researcher is given a list of all 51,000 students that go to the university and each student has a 10% chance of being selected to participate in the study, what type of sampling has occurred?

Ethnicity of USF students is