Essay on Statistics Final Exam Answers

So, we should reject the null hypothesis H0. At a 0.05 level of significance level, we conclude that there is a significant difference between the average height for females and the average height for the males.

Decision Rule: The calculated test statistic of -3.024 does fall in the rejection region of z<-1.645, therefore I would reject the null and say there is sufficient evidence to indicate mu<50.

The null hypothesis is rejected since the p-value is below the significance level of 0.05.

c) What is the null and alternative hypothesis? Do the data results lead you to reject or fail to reject the null hypothesis?

c. What kind of display would you use to show the association between job class and mode of

1. The researchers analyzed the data they collected as though it were at what level of measurement?

Table~\ref{tab:example1} shows the coefficient for Batting Average which is 5.4, this mean that 1 unit of increase in batting average produce a 5.4 increase in balco scandal variable. If our measure of batting average is equal to zero, we would expect the efect of steroides (balco scandal) decrease in a 1.5\%. The t value calculated is greater than the critical value of t thus we can reject the null hypothesis in this case. The p value shows a statistical significance at 95\% of confident.

1. Using the data in the file named Ch. 11 Data Set 2, test the research hypothesis at the .05 level of significance that boys raise their hands in class more often than girls. Do this practice problem by hand using a calculator. What is your conclusion regarding the research hypothesis? Remember to first decide whether this is a one- or two-tailed test.

Contingency table results for Q13 What best describes your political philosophy?=Conservative: Rows: Q13 What best describes your political philosophy? Columns: Q9 What is your college major? Business IT Legal Studies Nursing Other Psychology Total Conservative Liberal Moderate Total 4 0 0 4 1 0 0 1 5 0 0 5 12 0 0 12 4 0 0 4 14 0 0 14 40 0 0 40

Conclusion : Reject the null hypothesis. The sample provide enough evidence to support the claim that mean is significantly different from 12 .

A pharmaceutical company is testing the effectiveness of a new drug for lowering cholesterol. As part of this trial, they wish to determine whether there is a difference between the effectiveness for women and for men. Using   = .05, what is the value the test statistic?

In this mathematical circumstance, it is appropriate to use the Normal Model with this data distribution because of how roughly symmetric and unimodal. The summary statistics for the OB Math SAT scores are as follow: the number of values is 287, the mean of the data is 553.62369, the standard deviation is of approximately 65.984512, the median of the data is 540, the range of the data is 390, the minimum value is 360, the maximum value is 750, the first quartile of the data is 510, and the second quartile of the data is 590. To calculate the percent of students that had an SAT math score higher than 560, I used the z-score formula which is z-score= raw score- mean/ standard deviation and plugged the values for each variable. After

== = The data that we are going to use is secondary data that has been collected from a high school. It is made up of a collection of qualitative and quantitative variables . This also includes both discrete and continuous data.

Students in a science class have just received their grades on the first test. The instructor has provided information about the first test grades in some previous classes as well as the final average for the same students. Some of these grades have been sampled and are as follows:

A machine is set to fill the small size packages of M&M candies with 56 candies per bag. A sample revealed: 3 bags of 56, 2 bags of 57, 1 bag of 55, and 2 bags of 58. How many degrees of freedom are there?