Project #8550 - Statistics- Biostats

1) The test statistic for testing H0: mu=100 against Ha: mu 1) Determine the null and alternative hypotheses:

a-confidence interval will be wider

b-there is not enough info to determine the effect on the confidence interval

c- the confidence interval will be narrower

d-the confidence interval will be less likely to contain the parameter being estimated. 

 

2) The body temps of adults have a mean of 98.6F and a standard deviation of .60F. Describe the center (C) and variability(V) of the sampling distribution of the sample mean for a random sample of 75 adults

a- C=98.6, V=.008

b- C=98.6, V=.60

c- C=.60, V= .07

d- C=98.6, V= .14

e- C=98.6, V=.07

 

3) In a clinical test with 2171 subjects, 1214 showed improvements from the treatment. Find the margin of error for the 95% confidence interval used to estimate the population proportion. 

a-.0418

b- .0282

c- .0209

d-.0178

e-.0234

 

4) The gestation time for humans has a mean of 266 days and a standard deviation of 25 days. If 100 woman are randomly selected, find the probability that they have a mean pregnancy between 266 days and 268 days.

a-.7881

b- .2881

c- .5517

d- not enough info to determine 

e- .2119

 

5) Based on previous studies, researchers believe that 6% of children are born w/ a gene that is linked to a certain childhood disease. If the researchers test 950 newborns for the presence of this gene, would it be unlikely for them to find fewer than 25 children w/ hte gene? Answer by calculating the approx. z-score.

a- Yes, z= -6.59

b- Yes, z= -4.41

c- No, z= -6.59

d- No, z=-4.41

e- No, z= -.005

Subject Mathematics
Due By (Pacific Time) 07/05/2013 12:00 am
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