A study was designed to investigate the effects of two variables — (1) a student’s level of mathematical anxiety and (2) teaching method — on a student’s achievement in a mathematics course. Students who had a low level of mathematical anxiety were taught using the traditional expository method. These students obtained a mean score of 310 with a standard deviation of 40 on a standardized test. Assuming a mound-shaped and symmetric distribution, in what range would approximately 68% of the students score?

Some numbers are missing from the following contingency table. Fill in the missing numbers. Group 1 Group 2 Group 3 Total Male 82 21 120 Female 29 30 21 80 Total 111 38

The mean starting salary for nurses is dollars nationally. The standard deviation is approximately dollars. The starting salary is not normally distributed. A sample of starting salaries for nurses is taken. What is the probability the average starting salary for this sample is greater than ?

Fill in the blank with the correct form of the verb in parenthesis. Nosotros (ser) de México.

Select the most logical word to fill in the blank. Su nombre es Ana y su _________ es Lopez. 

Select the word that best completes the sentence. El perro no es delgado , es ____

Match the word to its opposite.

The following prescription indicates which type of refractive error? +1.25 Sphere

The following prescription indicates which type of refractive error? +2.00 -2.00 x 180

What is the first step in fitting progressive addition lenses?