Calculate the appropriate test statistic based on the information provided (round your answer to 4 decimal places): Research Question: Do more than 70% of people who work from home play video games? Population proportion = 70% Number of people from sample who said they play video games = 42 Sample size = 50

To compare the treatment effects of two interventions, two independent samples of patient medical data were collected. The sample sizes are 23 and 21 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?

Conduct a hypothesis test based on the following information using a significance level of 10%: Research Question: Do carpenters earn different salaries than accountants? Assume population variances for the two groups are equal to each other Group 1 = Carpenters Group 2 = Accountants Test statistic = 2.65 Group 1 Sample size = 15 Group 2 Sample size = 19

Calculate the lower bound of a 95% confidence interval for the sample mean for the given data (round your answer to 4 decimal places):   Population mean = 27.35 Sample mean = 26.25 Sample standard deviation = 3 Sample size = 25

Calculate the upper bound of a 95% interval for the difference in sample means for the given data (round your answer to 4 decimal places):   DO NOT ASSUME THE POPULATION STANDARD DEVIATIONS OF THE TWO SAMPLES ARE EQUAL Group 1: Carpenter Sample mean = 60000 Sample standard deviation = 5500 Sample size = 10   Group 2: Crane Operator Sample mean = 62500 Sample standard deviation = 2500 Sample size = 14

Which is NOT a way antibacterial drugs target bacterial cells?

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 40 of the women who were not pregnant. What is the probability (i.e., NPV) that a woman is not pregnant given that she tested negative on a screening test? Test                         Pregnant? Yes No Total + 170 40 210 – 30 260 290 Total 200 300 500

To investigate the prevalence rate of diabetes among men in Florida, we drew a random sample of 65 men from that population and among them 15 people had diabetes. For the following hypotheses, what would be your conclusion based on the information provided? The level of significance (alpha level) is 0.05. Ho:  P 0.2 (Alternative)

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) = size of the house in hundreds of square feet (i.e. X = 1 means one-hundred square feet)   yhat = 10 + 12.3*X   On average how many thousands of dollars will a house cost if it is 15 hundred square feet (round your answer to 4 decimal places)?

Conduct a hypothesis test based on the following information using a significance level of 5%: Research Question: Is the proportion of males enjoy video sames less than the proportion of females how enjoy video games?   Group 1 = Males Group 2 = Females Test statistic = -2.13 Group 1 Sample size = 76 Group 2 Sample size = 64