Suppose that you are interested in examining if it is true that on average men earn more than $30.00 a day more than women in certain entry level positions in technical fields.  If sample data show that 80 men earned on average  $353.78 a day with a standard deviation of $18.03, while 80 women earned on average $315.14 a day with a standard deviation of $21.22 with a standard deviation of $21.33, conduct a hypothesis test at the .01 level of significance. 

A confidence interval for a population mean has a margin of error of  3.4 What is the length of the confidence interval? If the sample mean is 52.8 obtain the confidence interval.    

Which of the following statements about the Pacific Ocean is TRUE?

Oxygen comprises about ________ percent of the Earth’s present atmosphere.

The ocean floor can be divided into three provinces, of the three, which is the shallower water areas?

Older lithosphere is destroyed in association with:

Which of the following is the deepest part of the ocean?

Most of Earth’s water was derived from ________.

A Community Center was interested in the effect of their program on summer loss. Summer loss is the decrease in academic knowledge from the summer to the Fall of the new year. To test their program they drew a random sample of 20 students from the program.  The students were assessed before and after the 6 week program on a 36 item assessment.  Difference scores  were calculated for the 20 students and are summarized below. These scores were calculated by subtracting the pre test from the post test score. (Each box in the chart below is a difference score for one of the 20 students. For example, the first student’s difference score is 2, the second student’s  difference score is 0, the third student’s difference score is 6.)   Difference Scores on Assessment Pre-Post Program (N=20)   At  .01 significance level, do the results support the effectiveness of the program slowing summer loss? Create a 90 % confidence interval. How does the confidence interval support your decision?  

Segments of the oceanic ridge system that are gentler and less rugged in slope due to faster rates of seafloor spreading are called ________.