Pregnancy In 1998, a San Diego reproductive clinicreported 42 live births to 157 women under the age of 38,but only 7 live births for 89 clients aged 38 and older. Isthis strong evidence of a difference in the effectiveness ofthe clinic’s methods for older women?a) Was this an experiment? Explain. b) Test an appropriate hypothesis and state your conclu-sion in context. c) If you concluded there was a difference, estimate thatdifference with a confidence interval and interpretyour interval in context.

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Pregnancy In 1998, 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) Was this an experiment? Explain.
b) Test an appropriate hypothesis and state your conclu-
sion in context.
c) If you concluded there was a difference, estimate that
difference with a confidence interval and interpret
your interval in context.
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