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A researcher would like to study BMI levels in adults 20-40 years of age. She selected 9 patients and found their BMI values to be: 38, 19, 25, 16, 29, 18, 34, 32, 30The standard deviation of BMI levels of this group of patients is

4 students apply to a PhD program. The program accepts 70% of all applicants. Students are accepted and rejected independently of each other. Let the random variable X represent the number out of the 4 students who get accepted from the PhD Program. (Hint: Binomial distribution with n=4 and p=70%)   What is the mean of the random variable? (round your answer to 4 decimal places)

To compare the treatment effects of two interventions, two independent samples of patient medical data were collected. The sample sizes are 20 and 22 respectively. Assuming that the two populations shared the same variance, the researchers decided to conduct a two independent samples test for the means. What would be the number of degrees of freedom for the obtained t statistic with these sample sizes?

Suppose you wish to compare the mean GPA of students in the College of Public Health to the mean GPA of students in the college of Medicine at USF.  If you have a list of all the students the fit into your population of interest and randomly select 100 students to be apart of your study, what type of sampling are you doing?

A researcher would like to study BMI levels in adults 20-40 years of age. She selected 9 patients and found their BMI values to be: 25, 19, 20, 21, 32, 37, 22, 27, 24The mean BMI level of this group of patients is

In a study on the effect of maternal exposure to cigarettes on the risk of preterm birth, the number of preterm births occurring among 130 women who smoked during pregnancy between 2010 and 2012 was compared to the number of preterm births among 192 women who did not smoke during pregnancy during the same time period. In a second study, the pregnancy medical records of 55 women who gave birth to premature infants were compared to those of 98 women who did not have a premature infant in order to assess if the women smoked during pregnancy.Which of the following statements is correct?

A graduate student is registering for 3 courses in one semester. X=the number of courses that are full at the time of registration.  The random variable X has a probability distribution as follows x 0 1 2 3 p(x) 0.45 0.25 0.20 0.10 The probability that more than two of the classes are full at the time of registration P(X >2) is equal to

A biostatistician finds the relationship between the number of weeks (X) spent in a hospital and number of seizures per week (Y) and is described by the following equation: .  This is based on a sample size of 50 patients and the associated coefficient of correlation is r = .93. Using this information above, answer the following question: How do you interpret the slope of b1 = .91?

Calculate the lower bound of a 95% confidence interval for the sample proportion for the given data (round your answer to 4 decimal places):   Population proportion = 70% Number of people from sample who said they play video games = 42 Sample size = 50

A researcher would like to study BMI levels in adults 20-40 years of age. She selected 9 patients and found their BMI values to be: 18, 29, 36, 22, 25, 27, 26, 30, 37The standard deviation of BMI levels of this group of patients is