Blog

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

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: 26, 20, 28, 32, 29, 38, 21, 25, 23The standard deviation of BMI levels of this group of patients is

The Central Limit Theorem is important in Statistics because it allows us to use the normal distribution to make inferences concerning the population mean:

Which of the following methods of graphing sample data can help you in determining the shape of a frequency distribution for the variable height (measured in inches)?

Say a study is interested in determining the average success rate of surgeons in the USA.  The researchers randomly select many hospitals over the country and contact surgeons in these hospitals and obtain their surgical files, but the surgical files do not contain the information need to accurately calculate each surgeons success rate.  The researchers use the files to calculate the success rate for each surgeon as best as they are able, but know the numbers are not exactly accurate.  What type of bias is this study most likely to suffer from?

Using the information below calculate the predicted value for Y for the given value of X. Y (Dependent Variable) = Cost of a house in thousands of dollars (i.e. Y = 1 means one-thousand dollars) X (Independent Variable) = number of miles from an elementary school   yhat =  325 – 6*X   On average how many thousands of dollars will a house cost if it is 15 miles from an elementary school (round your answer to 4 decimal places)?

Income of USF Administration (in dollars) is

Fourteen students were randomly selected from the College of Public Health and their diastolic blood pressure was tested. The sample mean and standard deviation were 81.6 mmHg and 2.3 mmHg respectively. What is the obtained t-score for this sample under the null hypothesis Ho: µ = 80?

A biostatistician finds the relationship between the number of weeks (X) spent in a hospital and number of seizures per week (Y) andis 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 r = .93?