# Project #14124 - Biostatistics

Biologists studying the healing of skin wounds measured the rate at which new cells closed a razor cut made in the skin of an anesthetized newt.  The measurement was the amount of scar tissue that developed per hour (in micrometers).  Based on the data below, complete the table.

 29 27 34 40 22 28 14 35 26 35 12 30 23 18 11 22 23 33

 90% CI [               ,               ] 95%  CI [               ,               ] 99%  CI [               ,               ]

How quickly can synthetic fabrics such as polyester decay in landfills?  A researcher buried polyester strips and measured the force required to break them.  Breaking strength is easy to measure and is a good indicator of decay.  Ten strips were buried, with five dug up after two weeks, and the remainder after 16 weeks.  The summary table is produced below.  Complete the C.I. Table.

 Group Treatment n s 1 2 weeks 5 123.8 4.60 2 16 weeks 5 116.4 16.09

 95% C.I. (assume equal variances) [               ,               ] 95% C.I. (assume unequal variances) [               ,               ]

For multiple sclerosis patients we wish to estimate the mean age at which the disease was first diagnosed.  We want a 90% confidence interval that is 8 years wide.  If the population variance is estimated to be 85 from previous research, how large a sample should be taken?

Planning Parenthood ®, a national organization that assists teenage mothers with pregnancy, estimates that approximately 37% of the women coming into the center had contracted a sexually transmitted infection.  They wish to plan a study to obtain a more statistically relevant estimate.

How many samples are required if we wish a 95% confidence interval that is within 0.03 of the true population proportion?

How many samples would be required if we wished to obtain the maximum possible number of samples needed (i.e., we do not want to rely on the 37% estimate from above) with a 95% confidence and 0.03 error?

 Subject Mathematics Due By (Pacific Time) 10/10/2013 12:00 pm
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