Weekend HW!

You have two responsibilities for this weekend:

1.) Study for your chapter 18 and 19 vocab quiz! (start of class Monday)
2.) Complete the True/False worksheet (provided in class or below)
3.) Do the extra credit homework (provided in class or below)

• You must correct any false statements (or re-write them to make them true)
• You must create your own example to get full credit!
• Please read below for help with statements d and f:
• Read the "diminishing returns" section on page 423
• And/or...consider this....
• We know that as we increase sample size, we will decrease standard error and margin of error...
• However, we also know that the "n" is under the radical (square root) in the formula for standard deviation/standard error...
• Therefore, if we increase the sample size by taking a sample that is 4 times larger, it will only decrease the standard error/margin of error by cutting it in half. This is because of that square root--we took a sample that is 4 times larger, but we need to take the square root of 4 (2), so we cut the standard error/ME in half (divide by 2).
• Or, if we take a sample that is 16 times larger we will make the standard error/ME smaller, but it will not be divided by 16--the standard error/ME will be "one fourth as large," or divided by 4 (because we need to take the square root of 16)
• Here is the chapter 18/19 vocab list:
• Use your chapter 18 vocab quiz (you did it with the sub and we went over the answers) to study!
• Sampling Distribution
• Be able to recognize a sampling distribution question
• Remember, a question requires us to use the sampling distribution formulas for standard deviation (from our formula sheet) if the question asks for a percent/probability regarding the mean of a sample or the percent of a sample...
• And you must be given sample size...
• Sampling Variability
• Standard Error
• Confidence Interval
• Critical Value
• Margin of Error
• Point Estimate (a single value used to estimate the value of a population parameter; this is our sample statistic, found at the center of an interval)
• 10% Condition (sample size must be less than 10% of the population size)
• WHY do we check the randomization condition? (to check that our sample is representative of the population)
• WHY do we check (n)(p-hat)>10 and (n)(q-hat)>10? (to check that our sample is large enough)
• Know how changing sample size and changing confidence level affect the margin of error and the width of an interval (Friday's notes!)
• What does the "One" in "One Proportion Z Interval" refer to?

On Monday we'll finish up chapter 19 by going over our homework and discussing the meaning of our confidence level! Then, on Tuesday we'll do some classwork/practice, and on Wednesday take another quiz! See you there!

Here is the true/false homework:

And here is the extra credit homework:

Finally, if you're feeling super ambitious, here is Monday night's homework--we'll learn how to interpret confidence levels on Monday, but you can do the other stuff:

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