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Econ 210 Spring Quarter 2009  Problem Set 6 
Due Date: 5/27/2009
Solve the following Problems. Show your work.
1.
True/False
a.
You estimate a sample proportion
ˆ
0.4
p
=
. The tstatistic corresponding to the null hypothesis
that p=0.6 is
0.24
0.4 0.6
N
t
−
=
b.
The higher the number of sample observations the wider the confidence interval.
c.
The sample proportion is a consistent estimator of the population proportion
d.
Testing for differences in population means is fundamentally different from testing hypotheses
about a single population mean.
2.
A president in charge of sales claims that salespeople are averaging no more than 15 sales contacts per
month. Assume sales are normally distributed. To check his claim N=36 salespersons are selected at
random and the number of contacts made by each is recorded for a single randomly selected month.
The mean and variance of the 36 measurements were 17 and 9, respectively.
a.
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This note was uploaded on 09/25/2010 for the course ECON 210 taught by Professor Pavan during the Winter '09 term at Northwestern.
 Winter '09
 Pavan

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