In One Sample Proportion test, it is important to convert the sample proportion to a z-score first. In this example, we selected a random sample of size 120 from a pool of university students and asked whether they use the university gym on a regular basis. Eighty replied yes. Assuming that the population proportion under the null hypothesis is 50%, what is the z-score (test statistics) for the sample proportion?

Select the appropriate null and alternative hypothesis for the following research question: Do people enjoy playing video games more than playing sports? phat1 = proportion of people who enjoy playing video games more than sports phat2 proportion of people who enjoy playing sports more than video games

It is known that the population standard deviation of weight among females is 27. Assuming that we have a random sample of 150, what is the standard error of the average weight among women of a sample of this size?

Using the information below calculate the predicted value for Y for the given value of X. Y (Dependent Variable) = Cost of an annual pass to Disney in dollars X (Independent Variable) = Average number of people who visit each day in thousands of people (i.e. X = 1 means one-thousand people)   yhat = 2122.86 – 30*X   On average what would be the cost of an annual pass to Disney if the average number of people who attend each day was 52 thousand (round your answer to 4 decimal places)?

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?