what statistic would you use if you had one independent variable, geographic location (north, south, east, west), and one dependent variable (satisfaction with the living environment, yes or no)?
what statistic would you use if you had one independent variable, geographic location (north, south, east, west), and one dependent variable (satisfaction with the living environment, yes or no)?
The pathogen Phytophthora capsici causes bell pepper plants to wilt and die. A research project was designed to study the effect of soil water content and the spread of the disease in fields of bell peppers. It is thought that too much water helps spread the disease. The fields were divided into rows and quadrants. The soil water content (percent of water by volume of soil) was determined for each plot. An important first step in such a research project is to give a statistical description of the data.
Soil Water Content for Bell Pepper Study
(a) Make a box-and-whisker plot of the data. Find the interquartile range.
In a study designed to investigate the effects of a strong magnetic field on the early development of mice, ten cages, each containing three 30-day-old albino female mice, were subjected for a period of 12 days to a magnetic field having an average strength of 80 Oe/cm. Thirty other mice, housed in ten similar cages, were not put in the magnetic field and served as controls. Listed in the table are the weight gains, in grams, for each of the twenty sets of mice.
Test whether the variances of the two sets of weight gains are significantly different. Let α=0.05. For the mice in the magnetic field,
An experiment designed to study the relationship between hypertension and cigarette smoking yielded the following data.
Test the hypothesis that whether or not an individual has hypertension is independent of how much that person smokes.
Contrary to popular belief, study design in terms of statistics and probability is not only used by engineers but also implemented by modern fashion designers and those specialists who produce and construct certain video games. As you will take a look at study design examples, you will see that it relates not only to probability and statistical analysis but to creative thinking as well, which makes it even more interesting. Start with your study design example and compare it to available study design questions as it will help you to deal with equations and choose the most efficient solutions.