CHAPTER 9 EXAM QUESTIONS AND ANSWERS 2026 VERIFIED.

CHAPTER 9 EXAM QUESTIONS AND
ANSWERS 2026 VERIFIED.




The correct formula for using the sample standard deviation to estimate the population
standard deviation.


a. has N in the denominator.
b. has (N-1) in the denominator
C. has N2 in the denominator

D. Has N in the numerator - ANS B


The formula "H0: µ1 = µ2" is used to represent the:
A. alternative hypothesis
B. research hypothesis
C. null hypothesis

standard error - ANS C


The symbol representing a standard deviation calculated by using a sample to estimate the
population standard deviation is:
A. sd.
B. the Greek letter 'sigma'.
C. s.

D. Std. Dev. - ANS C


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, As sample size increases, the t distribution:
A. is unreliable.
B. has a standard deviation of 0.
C. becomes similar to the z distribution.

D. has a standard deviation of 0.50. - ANS C


The method for calculating s will result in a ________ value as compared to SD.
A. smaller
B. larger
C. more negative

D. less accurate - ANS B


The difference between the denominator of the z test and that of the single sample t test is
that:


A. in the z test we divide by the estimated standard error, but in a t test we divide by the actual
standard error.


B. in the z test we divide by the actual population standard error, but in a t test we divide by the
estimated standard error.


C. in the t test we divide by the actual population standard deviation, but in a z test we divide
by the sample standard deviation.


D. in the t test we divide by the sample standard

deviation, but in a z test we divide by the population standard deviation. - ANS B


If the standard deviation for a population, as estimated from a sample, is s = 5.6, then the
standard error for a sample size of N = 16 is:
A. SM = 1.40.

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