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A study of residents in the city of Houston showed that the mean income for all adults is $75,000 with a standard deviation of $5,000.  A randomly selected sample of these residents showed an average income of $78,000 with a standard deviation of $4,700. Are the numbers $78,000 and $4,700 statistics or parameters? Explain.

A school district’s study 5 years ago showed that the average number of special education students per grade was 12 students.   Now, the school district is considering increasing the number of special education teachers because they believe the average number of special education students per grade has significantly increased.  After running a hypothesis test, the result was reject Ho and accept Ha.  What decision should the school district make regarding increasing the number of special education teachers?

Quinnipiac University conducted a telephone survey poll of 1,795 adults 18 years and older throughout the United States.  The margin of error was +/- 2.3  at the 95% confidence level.   The following was published from this survey: 22% of Americans state the cost of food is their most pressing financial worry. Give a confidence interval for the percentage of all Americans who state food cost is their most pressing financial worry.

A child psychologist wants to determine if there is a significant difference between the amount of time it takes to toilet-train boys and the amount of time it takes to toilet train girls.   The 99% confidence interval for boys was found to be 8 to 16 months.  The 99% confidence interval for girls was found to be 2 to 10 months.   With these results, is it possible  (with 99% certainty) that the mean toilet-training time for boys and girls is the same?  

Choose the correct decision rule.

Suppose a confidence interval for the proportion of Americans who are unemployed is 6.4% to 8.8%,  What is the margin of error?

Which is the adjective used when pertaining to the lungs?  

Choose ALL the words that are in their PLURAL form.  

If you correctly answer the following questions, you might earn some bonus points! Due Date/Time: 11:59 PM MONDAY DECEMBER 8, 2025.  Maximum Time Limit = 15 Minutes (in one sitting) Must be taken in one 15-minute sitting/session. Must Use Honorlock. Remember to show your photo ID, please. Acceptable forms of ID include: CCAC Student ID, Driver’s License, or other Government-Issued ID.  Spelling counts. Reminder:  If students do not submit exams by the scheduled due date and time, then they won’t earn any points. REMINDERS: Exams, tests, and quizzes are closed books, closed notes, closed slides, closed assignments, and taken individually. No additional devices allowed other than the one (1) being used for the exam/test/quiz. Only the test/exam/quiz screen should be open. A simple, basic calculator can be used (not phones). No other windows, websites, programs are permitted. “Cheating = The act or attempted act of deception by which a student misrepresents that he/she has mastered information on an academic exercise that, in fact, has not been mastered.”If you are found to be cheating on an exam or assignment at the very least, you will receive a grade of “0” for that exam or assignment. This may also lead to a failing grade in the course and disciplinary action by the college and the Dean of Academic Affairs. Please do not diminish your learning experience by cheating.  

Arrange the following aqueous solutions in order of increasing boiling points.  I:  0.5 m CH3CH2OH (ethanol) II: 0.2 m MgCl2 III: 0.4 m KCl