Monday HW = Math Problems! (and some conditions...)

Monday HW: tonight, please complete the following in your textbook...

• Pages 429-431: 15, 17, 25, 35
• Skip conditions for 15 and 35 
• This means you DO have to check conditions for 17 and 25c
• Remember, any time we want to use a sampling distribution we HAVE to check conditions--it's on us to remember that!
• For #15...
• Think: if the newspaper's sample is going to lead them to "predict defeat," that's the same thing as saying the "% of the sample who support the budget is below 50%...."
• For #17...
• p = 0.08%--the "true" % of all apples on the truck that do not meet the standard
• For #25...
• I love this one because here (a-d) we have a blend of some questions that do require the sampling distribution (for means) and some that do not require a sampling distribution--part of your challenge is to decide when you'll need the sampling distribution....
• For 25c when it asks to give the "model, mean, and standard deviation," you can just list the shape, the number in the middle of the model = mean, and calculate the standard deviation. AND CHECK CONDITIONS!
• For #35...
• We already checked conditions for this context in a previous HW
• 35a.) "What's the approximate model" means list the shape, center (a #), and spread (calculate st. dev.)
• Normalcdf v. Invnorm reminder....
• 25 and 35 include both of these....
• Remember, if you want to find a probability/% using a Normal model/sampling distribution, use normalcdf...
• If you want to find a "cutoff value" given a percentile/% above/% below then you use invnorm...
• For invnorm: area = % left (in decimal form)