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- For the "math" parts of the hypothesis test use your calculator to record the z-score, p-value, and p-hat pooled; tomorrow we'll look at how we "show the work" for this test!
- Remember, you won't have classwork time for practice, so all of your practice comes from your homework! We'll have a take home quiz this weekend!
- Our only classwork will be a (short) MC practice to start class on Friday!
Also, remember that STAMPS are DUE TOMORROW! Count them up, write the total on the front, and fasten them together/put them in an envelope or something!
- Remember, only papers that are actually stamped count! If you sneak in papers that weren't stamped you'll earn a 0 for your stamps! I'm checking!
Here are the homework questions!
15.) A San Diego reproductive clinic reported 42 live births to 157 women under the age of 38, but only 7 live births for 89 clients aged 38 and older. Is this strong evidence of a difference in the effectiveness of the clinic's methods for older women?
a.) Test an appropriate hypothesis and state your conclusion.
b.) If you concluded there was a difference, estimate that difference witha confidence interval and interpret your interval in context!
19.) In 2001, one county reported that among 3132 white women who had babies, 94 were multiple births. There were also 20 multiple births to 606 black women. Does this indicate any racial difference in the likelihood of multiple births?
a.) Test an appropriate hypothesis and state your conclusion.
b.) If your conclusion is incorrect, which type of error did you commit?
21.) It's widely believed that regular mammogram screening may detect breast cancer early, resulting in fewer deaths from that disease. One study that investigated this issue over a period of 18 years was published during the 1970s. Among 30,565 women who had never had mammograms, 196 died of breast cancer, while only 153 of 30,131 who had undergone screening died of breast cancer.
a.Do these results suggest that mammograms may be an effective screening tool to reduce breast cancer deaths?
b. If your conclusion is incorrect, what type of error have you committed?
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