If a researcher wishes to increase her confidence level from, for example, 95% to 99%
what approximately will be the effect on sample size?
a. The sample size will decrease in proportion to the increase in the confidence level.
b. The ratio of the new sample size to the old is 3/2.
c. The ratio of the new sample size to the old is 2/3.
d. The ratio of the new sample size to the old is 9/4.
e. The ratio of the new sample size to the old is 4/9.
A clothing manufacturer traditionally makes sweatshirts from three different fabrics, A,
B and C. Over the years the percentages sold of each fabric are 50, 35, and 15,
respectively. Recently, the manufacturer began producing running suits from the same
three fabrics. During the first three months of production, the company received orders
for 6,500 suits made from fabric A, 3,400 from fabric B, and 2,700 from fabric C.
What is the value of the test statistic useful for determining how well the pattern of
sales (by fabric type) of the new running suit correspond to the expected pattern?
a. 136.21
b. 584.81
c. 0.973
d. 422.13
e. none of the above
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