Note:  Questions 20-25 are drawn from concepts introduced in Ch 6.  You will be using the z-tables for these questions. Remember how helpful it can be to sketch and label a bell curve for each situation.A recent study of teacher salaries in rural areas showed that the average salary was $31,950 a year with a standard deviation of $1400. For question 20, if one teacher is chosen at random, find the probability that this teacher earns more than $32,500 a year. Express your answer as a decimal.  Recall the importance in using a bell curve sketch for this type of question.

A survey of 172 applicants for police officer training showed that 43 of the applicants were women For question 13, fill in the blank with your value for “p hat” .For question 14, give your answer for the highest value of the 95% confidence interval of the true proportion of women who applied for police training.  Recall you will be using the z-tables for this question. Round your decimal answer to the hundredths place if necessary, Example:  0.28

5. Find the area between z=-1.22 and z=+1.58.  Express your answer as a decimal. For example:    0.6255.

A survey is conducted to estimate the average age of students enrolled in a college.The population standard deviation is known to be 3.7 years. 42 students were interviewed and their average age was 22.4 years.For question 6, give the lowest value of the 90% confidence interval of the population mean (rounded to the tenths place).For question 7, refer back to this question and give the highest value of the 90% confidence interval (rounded to the tenths place) of the population mean. Note: the z-tables will be used for questions 6 and 7.

In order to be considered for admission to a famous and top-notch  computer school, candidates must score in the top 3% on a comprehensive test. This test has a mean score of 240 and a standard deviation of 31. Assuming the scores are normally distributed, find the lowest possible score necessary to be in the top 3% on this test. For question 24 give the Z-value you will use in your calculation. For question 25 give your actual calculated score.  

Give your answer your answer for Chi-squared left (see question 17 above).

Tornadoes are ranked in terms of wind speed and related property damage using the ________ scale.

Vertical zonation is particularly prominent in which region?

Hurricanes in Australia are known as

Changes in Earth’s elliptical orbit around the Sun is called