Assessment
Directions: Choose the best answer to the given questions or statements.
Write the letter of your choice on a separate sheet of paper.
1. What test statistic will be used if the sample size is below 30?
A. t-test
C. population mean
B. z-test
D, standard deviation
2. In using t-test for a population mean, we assume that the sample is
selected randomly. The given statement is:
A. always true
C. sometimes true
B. always false
D. sometimes false
3. If the population standard deviation is unknown, what test statistic is to
be used?
A. t-test
c. population mean
B. Z-test
D. standard deviation
-
4. In finding the t-computed value, which formula should be used?
A. t= -2
B. t =
-
C. t = -1
D. t =
VE
VE
5. When should you use the z-test?
1. When you are testing for a population mean
When the population standard deviation is given
III. When the sample standard deviation ONLY is given
IV. When you are testing with small sample sizes, n < 30.
A. I and II
B. II and III
C. II and IV
D. I and III
For nos. 6-8, refer to the problem below:
Milky Milk is sold in packets with an advertised mean weight of
0.5kgs. The standard deviation is known to be 0.11 kilograms. A consumer
group wishes to check the accuracy of the advertised mean and takes a
sample of 36 packets finding an average weight of 0.47kgs.
6. What test statistic should be used?
A t-test
C. population mean
B. z-test
D. standard deviation