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Multiple Choices
I.
Which of the following statements is( are) required assumption( s) for developing
an interval estimate of the difference between two population means when the
samples are small?
a. Both populations have normal distributions.
b. The variances of the two populations are equal.
c. The means of the two populations must be known.
d. Both (a) and (b) above.
2. Independent simple random samples are taken to test the difference between the
means of two populations with unknown variances. The sample sizes are nl
=
25
and n2
=
35.
It
is assumed that the variances of the populations are equal and that
the populations are normally distributed. Which distribution should be used?
a. normal distribution
b. t distribution with 60 degrees of freedom
c. t distribution with 58 degrees of freedom
d. none of the above
Exhibit 1
The following information was obtained from independent random samples.
Assume normally distributed populations with equal variances.
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This note was uploaded on 01/31/2011 for the course MGMT 305 taught by Professor Priya during the Spring '08 term at Purdue University.
 Spring '08
 Priya

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